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fix(tcp): bound payload by IPv4 Total Length — drops NIC Ethernet padding (data-phase RST)#110

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gspivey merged 1 commit into
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agent/tcp-codec-padding-fix
Jul 2, 2026
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fix(tcp): bound payload by IPv4 Total Length — drops NIC Ethernet padding (data-phase RST)#110
gspivey merged 1 commit into
developmentfrom
agent/tcp-codec-padding-fix

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@gspivey

@gspivey gspivey commented Jul 2, 2026

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Root cause of DPDK-TCP connections resetting in the data phase (perf run 28557222376: TRex opened 150,002 flows, 0 sustained; DUT logs show connection reset on every flow).

parse_tcp_packet computed the TCP payload as frame[payload_start..] — all bytes to the end of the frame — and never bounded it by the IPv4 Total Length. AWS ENA (like any NIC) hardware-pads sub-60-byte Ethernet frames to the 60-byte minimum, so a peer's bare 54-byte ACK arrives as 60 bytes. Those 6 padding bytes were parsed as a 6-byte TCP "payload", so the engine advanced rcv_nxt by 6 and ACKed data the peer never sent → per RFC 793 the peer RSTs → every flow reset right after the first echo.

Fix

Bound payload by the IPv4 Total Length. Regression test parse_ignores_ethernet_padding builds a bare ACK, pads it to 60 B, and asserts an empty payload — fails before, passes after. All 221 tcp tests pass; offline, no EC2 needed.

This is a genuine stack correctness bug (affects any NIC-padded short frame), not perf-only. Found via a multi-agent diagnostic workflow over the run logs + engine code.

Note: real perf numbers also need the separate TRex stats-key fix (coming) — this PR stops the resets; that one reads the counters from the right dict. Follow-up: check whether the UDP/QUIC codecs need the same Total-Length bound.

🤖 Generated with Claude Code

@gspivey @claude
fix(tcp): bound TCP payload by IPv4 Total Length (drop NIC Ethernet p…
15e7e0f 
…adding)

parse_tcp_packet took payload as frame[payload_start..] (to end of frame) and
never read the IPv4 Total Length. NICs hardware-pad sub-60-byte frames to the
60-byte Ethernet minimum, so a peer's bare 54-byte ACK arrives as 60 bytes;
those 6 padding bytes were parsed as TCP payload, advancing rcv_nxt past what
the peer actually sent. The DUT then ACKed unsent data and the peer RST the
flow — observed as EVERY connection resetting in the data phase during perf run
28557222376 (150k flows opened, 0 sustained).

Bound payload by the IPv4 Total Length (frame[ip+2..ip+4]). Regression test
parse_ignores_ethernet_padding feeds a 54-byte bare ACK padded to 60 bytes and
asserts an empty payload; fails before the fix (6-byte payload), passes after.
Offline, no EC2. Found via a diagnostic workflow over the perf-run logs + code.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Synthetic Performance Results — Graviton (run)

Commit: c29c449c

✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)

Synthetic UDP Performance Results

Measures framework overhead: sync dpdk_udp::UdpSocket vs async (std::sync::Mutex + try_recv_from).

IPv4 Baseline

Test Payload Sync PPS Async PPS Ratio (sync/async) Async ns/op
TX send_to 64B 11.5M 11.0M 1.0x 91
RX recv_from 64B 3.4M 4.5M 0.7x 221
TX send_to 1400B 1.6M 1.6M 1.0x 612
RX recv_from 1400B 1.1M 1.1M 0.9x 869

IPv6

Test Payload Sync PPS Async PPS Ratio (sync/async) Async ns/op
TX send_to (IPv6) 64B 8.7M 8.3M 1.0x 119
RX recv_from (IPv6) 64B 3.7M 5.4M 0.7x 185
TX send_to (IPv6) 1400B 2.7M 2.6M 1.0x 378
RX recv_from (IPv6) 1400B 1.1M 1.2M 0.9x 856

IPv6 vs IPv4 Comparison (sync path)

Test Payload IPv4 PPS IPv6 PPS IPv4/IPv6 Ratio
TX send_to (sync) 64B 11.5M 8.7M 1.33x
RX recv_from (sync) 64B 3.4M 3.7M 0.90x
TX send_to (sync) 1400B 1.6M 2.7M 0.62x
RX recv_from (sync) 1400B 1.1M 1.1M 0.98x

IPv4 avg sync/async ratio: 0.9x, worst: 1.0x | IPv6 vs IPv4 worst ratio: 1.33x (OK)

OK: IPv6 is 32.8% slower than IPv4 — within acceptable threshold (<50%). Expected due to larger headers (40B vs 20B) and mandatory UDP checksum.

Good: Async wrapper is within 1.0x of sync — minimal framework overhead.

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Synthetic Performance Results (run)

Commit: c29c449c

✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to 10.0.0.1:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)
✅ synthetic UDP socket bound to [2001:db8::1]:9000 (MAC: 02:00:00:00:00:01)

Synthetic UDP Performance Results

Measures framework overhead: sync dpdk_udp::UdpSocket vs async (std::sync::Mutex + try_recv_from).

IPv4 Baseline

Test Payload Sync PPS Async PPS Ratio (sync/async) Async ns/op
TX send_to 64B 10.9M 10.2M 1.1x 98
RX recv_from 64B 3.2M 3.7M 0.9x 273
TX send_to 1400B 1.7M 1.7M 1.0x 605
RX recv_from 1400B 950.8K 986.6K 1.0x 1013

IPv6

Test Payload Sync PPS Async PPS Ratio (sync/async) Async ns/op
TX send_to (IPv6) 64B 9.1M 8.6M 1.1x 116
RX recv_from (IPv6) 64B 3.6M 4.1M 0.9x 243
TX send_to (IPv6) 1400B 2.7M 2.7M 1.0x 372
RX recv_from (IPv6) 1400B 919.4K 959.9K 1.0x 1041

IPv6 vs IPv4 Comparison (sync path)

Test Payload IPv4 PPS IPv6 PPS IPv4/IPv6 Ratio
TX send_to (sync) 64B 10.9M 9.1M 1.20x
RX recv_from (sync) 64B 3.2M 3.6M 0.88x
TX send_to (sync) 1400B 1.7M 2.7M 0.61x
RX recv_from (sync) 1400B 950.8K 919.4K 1.03x

IPv4 avg sync/async ratio: 1.0x, worst: 1.1x | IPv6 vs IPv4 worst ratio: 1.20x (OK)

OK: IPv6 is 19.8% slower than IPv4 — within acceptable threshold (<50%). Expected due to larger headers (40B vs 20B) and mandatory UDP checksum.

Good: Async wrapper is within 1.1x of sync — minimal framework overhead.

@gspivey gspivey merged commit 774e302 into development Jul 2, 2026
7 checks passed
@gspivey gspivey deleted the agent/tcp-codec-padding-fix branch July 2, 2026 03:01
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[CI] Stage: Deploy

Infrastructure ready.

  • Sender: i-01000949df5ddf745 (DPDK ENI: 10.0.1.70)
  • Receiver: i-000ca9c20d92507c3 (DPDK ENI: 10.0.1.102)
  • Both instances SSM-ready.

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[CI] Stage: Deploy

Infrastructure ready.

  • Sender: i-0a7cb2096637b548b (DPDK ENI: 10.0.1.126)
  • Receiver: i-020a499f10a51325e (DPDK ENI: 10.0.1.122)
  • Both instances SSM-ready.

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[CI] Stage: Summary

All tests PASSED.

ARP seeding: kernel /proc/net/arp (automatic)

  • tier1-dpdk-echo: 6 tests, 0 failures
  • tier2-kernel-interop: 4 tests, 0 failures
  • tier3-iperf-interop: 1 tests, 0 failures
  • tier3-iperf-interop: 1 tests, 0 failures

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[CI] Stage: Summary

All tests PASSED.

ARP seeding: kernel /proc/net/arp (automatic)

  • tier1-dpdk-echo: 6 tests, 0 failures
  • tier2-kernel-interop: 4 tests, 0 failures
  • tier3-iperf-interop: 1 tests, 0 failures
  • tier3-iperf-interop: 1 tests, 0 failures

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✅ Integration Tests Passed — Graviton (run)

Branch: 110/merge | Commit: c29c449c

Test Results

  • tier1-dpdk-echo.xml: 6 tests, 0 failures
  • tier2-kernel-interop.xml: 4 tests, 0 failures
  • tier3-iperf-sends.xml: 1 tests, 0 failures
  • tier3-our-app-sends.xml: 1 tests, 0 failures

Application Logs (last 20 lines)

receiver-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.102:9000 (MAC: 02:36:e0:72:e8:bd)
echo listening on 10.0.1.102:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.70:9000 (MAC: 02:4e:74:fe:b3:49)
echo listening on 10.0.1.70:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-test-client.log

EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
DPDK bind failed (Port init failed: Invalid port ID: 0), falling back to tokio
Backend: tokio
Sending packets...
Sent 12 bytes: 'arp-probe #1'
Received 12 bytes from 10.0.1.102:9000: 'arp-probe #1'
Test complete
[2026-07-02T03:13:06Z] INFO: ARP resolution succeeded (got response from peer)
[2026-07-02T03:13:06Z] INFO: Test: udp_send_receive
[2026-07-02T03:13:07Z] INFO: UDP send/receive succeeded
[2026-07-02T03:13:07Z] INFO: Test: echo_roundtrip
[2026-07-02T03:13:08Z] INFO: Echo roundtrip succeeded: 5/5 responses received
[2026-07-02T03:13:08Z] INFO: Test: payload_integrity
[2026-07-02T03:13:08Z] INFO: Response received, checking payload match...
[2026-07-02T03:13:08Z] INFO: Payload integrity verified (found in response)
[2026-07-02T03:13:08Z] INFO: JUnit XML written to: /tmp/test-results/tier2-kernel-interop.xml
[2026-07-02T03:13:08Z] INFO: Tier 2 sender tests complete. Results: /tmp/test-results/tier2-kernel-interop.xml

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✅ Integration Tests Passed (Run 28562108531)

Branch: 110/merge | Commit: c29c449c

Test Results

  • tier1-dpdk-echo.xml: 6 tests, 0 failures, skipped
  • tier2-kernel-interop.xml: 4 tests, 0 failures, skipped
  • tier3-iperf-sends.xml: 1 tests, 0 failures, skipped
  • tier3-our-app-sends.xml: 1 tests, 0 failures, skipped

Application Logs (last 20 lines)

receiver-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.122:9000 (MAC: 02:ae:31:66:d7:c9)
echo listening on 10.0.1.122:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.126:9000 (MAC: 02:a5:ba:4c:23:4b)
echo listening on 10.0.1.126:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-test-client.log

EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
DPDK bind failed (Port init failed: Invalid port ID: 0), falling back to tokio
Backend: tokio
Sending packets...
Sent 12 bytes: 'arp-probe #1'
Received 12 bytes from 10.0.1.122:9000: 'arp-probe #1'
Test complete
[2026-07-02T03:13:30Z] INFO: ARP resolution succeeded (got response from peer)
[2026-07-02T03:13:30Z] INFO: Test: udp_send_receive
[2026-07-02T03:13:31Z] INFO: UDP send/receive succeeded
[2026-07-02T03:13:31Z] INFO: Test: echo_roundtrip
[2026-07-02T03:13:32Z] INFO: Echo roundtrip succeeded: 5/5 responses received
[2026-07-02T03:13:32Z] INFO: Test: payload_integrity
[2026-07-02T03:13:32Z] INFO: Response received, checking payload match...
[2026-07-02T03:13:32Z] INFO: Payload integrity verified (found in response)
[2026-07-02T03:13:32Z] INFO: JUnit XML written to: /tmp/test-results/tier2-kernel-interop.xml
[2026-07-02T03:13:32Z] INFO: Tier 2 sender tests complete. Results: /tmp/test-results/tier2-kernel-interop.xml

receiver-test-client-iperf.log

[2026-07-02T03:20:57Z] INFO: iperf-sends: sent 10 packets, received 10 responses
[2026-07-02T03:20:57Z] INFO: iperf-sends: PASS (sent >= 5 packets)
[2026-07-02T03:20:57Z] INFO: JUnit XML written to: /tmp/test-results/tier3-iperf-sends.xml
[2026-07-02T03:20:57Z] INFO: iperf-sends test complete

sender-test-client-iperf.log

Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #3'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #4'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #4'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #5'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #5'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #6'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #6'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #7'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #7'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #8'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #8'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #9'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #9'
Sent 31 bytes: 'dpdk-to-kernel-test-payload #10'
Received 31 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #10'
Test complete
[2026-07-02T03:19:45Z] INFO: our-app-sends: sent 10 packets, received 10 responses
[2026-07-02T03:19:45Z] INFO: our-app-sends: PASS (sent >= 5 packets)
[2026-07-02T03:19:45Z] INFO: JUnit XML written to: /tmp/test-results/tier3-our-app-sends.xml
[2026-07-02T03:19:45Z] INFO: our-app-sends test complete
Full Application Logs (last 200 lines each)

receiver-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.122:9000 (MAC: 02:ae:31:66:d7:c9)
echo listening on 10.0.1.122:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-echo-server.log

EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.126:9000 (MAC: 02:a5:ba:4c:23:4b)
echo listening on 10.0.1.126:9000 (MTU=9001, max_udp_payload=8973)
Shutting down gracefully...

sender-test-client.log

[2026-07-02T03:10:02Z] INFO: Test: arp_resolution
UDP Test Client
Target: 10.0.1.122:9000
Bind address: 10.0.1.126:0
Message: 'arp-probe'
Count: 1
EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.126:32768 (MAC: 02:a5:ba:4c:23:4b)
Backend: dpdk
Sending packets...
Sent 12 bytes: 'arp-probe #1'
Received 12 bytes from 10.0.1.122:9000: 'arp-probe #1'
Test complete
[2026-07-02T03:10:03Z] INFO: ARP resolution succeeded (got response from peer)
[2026-07-02T03:10:03Z] INFO: Test: udp_send_receive
[2026-07-02T03:10:05Z] INFO: UDP send/receive succeeded
[2026-07-02T03:10:05Z] INFO: Test: echo_roundtrip
[2026-07-02T03:10:06Z] INFO: Echo roundtrip succeeded: 5/5 responses received
[2026-07-02T03:10:06Z] INFO: Test: payload_integrity
[2026-07-02T03:10:07Z] INFO: Response received, checking payload match...
[2026-07-02T03:10:07Z] INFO: Payload integrity verified (found in response)
[2026-07-02T03:10:07Z] INFO: Test: jumbo_diagnostics
[2026-07-02T03:10:07Z] INFO: === JUMBO FRAME DIAGNOSTICS ===
[2026-07-02T03:10:07Z] INFO: Interface MTU:
  9001
  65536
[2026-07-02T03:10:07Z] INFO:   ens5: MTU=9001
[2026-07-02T03:10:07Z] INFO:   lo: MTU=65536
[2026-07-02T03:10:07Z] INFO: Routing table MTU column:
Iface	Destination	Gateway 	Flags	RefCnt	Use	Metric	Mask		MTU	Window	IRTT                                                       
ens5	00000000	0101000A	0003	0	0	512	00000000	0	0	0                                                                             
ens5	0200000A	0101000A	0007	0	0	512	FFFFFFFF	0	0	0                                                                             
ens5	0001000A	00000000	0001	0	0	512	00FFFFFF	0	0	0                                                                             
ens5	0101000A	00000000	0005	0	0	512	FFFFFFFF	0	0	0                                                                             
[2026-07-02T03:10:07Z] INFO: DPDK port config (from echo server log):
[2026-07-02T03:10:07Z] INFO:   (no MTU info in echo log)
[2026-07-02T03:10:07Z] INFO: === END JUMBO DIAGNOSTICS ===
[2026-07-02T03:10:07Z] INFO: Test: jumbo_echo_8000
[2026-07-02T03:10:09Z] INFO: Jumbo output: UDP Test Client
Target: 10.0.1.122:9000
Bind address: 10.0.1.126:0
Payload size: 8000 bytes
Count: 3
EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.126:32768 (MAC: 02:a5:ba:4c:23:4b)
Backend: dpdk
Sending packets...
Sent 8000 bytes (binary payload)
Received 8000 bytes from 10.0.1.122:9000 (expected 8000, OK)
Sent 8000 bytes (binary payload)
Received 8000 bytes from 10.0.1.122:9000 (expected 8000, OK)
Sent 8000 bytes (binary payload)
Received 8000 bytes from 10.0.1.122:9000 (expected 8000, OK)
Test complete
[2026-07-02T03:10:09Z] INFO: Jumbo frame echo succeeded: 3/3 responses with correct size
[2026-07-02T03:10:09Z] INFO: JUnit XML written to: /tmp/test-results/tier1-dpdk-echo.xml
[2026-07-02T03:10:09Z] INFO: Tier 1 sender tests complete. Results: /tmp/test-results/tier1-dpdk-echo.xml
[2026-07-02T03:13:30Z] INFO: Test: arp_resolution
UDP Test Client
Target: 10.0.1.122:9000
Bind address: 0.0.0.0:0
Message: 'arp-probe'
Count: 1
EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
TELEMETRY: No legacy callbacks, legacy socket not created
DPDK bind failed (Port init failed: Invalid port ID: 0), falling back to tokio
Backend: tokio
Sending packets...
Sent 12 bytes: 'arp-probe #1'
Received 12 bytes from 10.0.1.122:9000: 'arp-probe #1'
Test complete
[2026-07-02T03:13:30Z] INFO: ARP resolution succeeded (got response from peer)
[2026-07-02T03:13:30Z] INFO: Test: udp_send_receive
[2026-07-02T03:13:31Z] INFO: UDP send/receive succeeded
[2026-07-02T03:13:31Z] INFO: Test: echo_roundtrip
[2026-07-02T03:13:32Z] INFO: Echo roundtrip succeeded: 5/5 responses received
[2026-07-02T03:13:32Z] INFO: Test: payload_integrity
[2026-07-02T03:13:32Z] INFO: Response received, checking payload match...
[2026-07-02T03:13:32Z] INFO: Payload integrity verified (found in response)
[2026-07-02T03:13:32Z] INFO: JUnit XML written to: /tmp/test-results/tier2-kernel-interop.xml
[2026-07-02T03:13:32Z] INFO: Tier 2 sender tests complete. Results: /tmp/test-results/tier2-kernel-interop.xml

receiver-test-client-iperf.log

[2026-07-02T03:20:57Z] INFO: iperf-sends: sent 10 packets, received 10 responses
[2026-07-02T03:20:57Z] INFO: iperf-sends: PASS (sent >= 5 packets)
[2026-07-02T03:20:57Z] INFO: JUnit XML written to: /tmp/test-results/tier3-iperf-sends.xml
[2026-07-02T03:20:57Z] INFO: iperf-sends test complete

sender-test-client-iperf.log

[2026-07-02T03:19:42Z] INFO: Pre-flight: checking DPDK state and ARP cache...
[2026-07-02T03:19:42Z] INFO: Local IP: 10.0.1.126, Peer IP: 10.0.1.122, Port: 9000
[2026-07-02T03:19:42Z] INFO: /proc/net/arp contents:
IP address       HW type     Flags       HW address            Mask     Device
10.0.1.126       0x1         0x2         02:a5:ba:4c:23:4b     *        ens5
10.0.1.1         0x1         0x2         02:f6:4f:f2:9e:77     *        ens5
10.0.1.122       0x1         0x2         02:ae:31:66:d7:c9     *        ens5
10.0.1.32        0x1         0x2         02:ae:40:b6:49:eb     *        ens5
[2026-07-02T03:19:42Z] INFO: DPDK runtime state:
No /var/run/dpdk/ directory
[2026-07-02T03:19:42Z] INFO: vfio-pci bindings:
0000:00:06.0
bind
module
new_id
remove_id
uevent
unbind
[2026-07-02T03:19:42Z] INFO: Test binary: /opt/dpdk-stdlib/target/release/test-client
-rwxr-xr-x. 2 root root 1950776 Jul  2 03:06 /opt/dpdk-stdlib/target/release/test-client
[2026-07-02T03:19:42Z] INFO: Launching test-client: /opt/dpdk-stdlib/target/release/test-client --target 10.0.1.122 --port 9000 --bind-ip 10.0.1.126 --count 10 --delay 200
[2026-07-02T03:19:45Z] INFO: Test client output: UDP Test Client
Target: 10.0.1.122:9000
Bind address: 10.0.1.126:0
Message: 'dpdk-to-kernel-test-payload'
Count: 10
EAL: Detected CPU lcores: 2
EAL: Detected NUMA nodes: 1
EAL: Detected shared linkage of DPDK
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: VFIO support initialized
EAL: Using IOMMU type 8 (No-IOMMU)
EAL: Probe PCI driver: net_ena (1d0f:ec20) device: 0000:00:06.0 (socket -1)
TELEMETRY: No legacy callbacks, legacy socket not created
Warning: Some RX offloads not supported by device (flags: 0x1)
Warning: Some TX offloads not supported by device (flags: 0x1)
✅ DPDK UDP socket bound to 10.0.1.126:32768 (MAC: 02:a5:ba:4c:23:4b)
Backend: dpdk
Sending packets...
Sent 30 bytes: 'dpdk-to-kernel-test-payload #1'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #1'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #2'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #2'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #3'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #3'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #4'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #4'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #5'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #5'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #6'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #6'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #7'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #7'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #8'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #8'
Sent 30 bytes: 'dpdk-to-kernel-test-payload #9'
Received 30 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #9'
Sent 31 bytes: 'dpdk-to-kernel-test-payload #10'
Received 31 bytes from 10.0.1.122:9000: 'dpdk-to-kernel-test-payload #10'
Test complete
[2026-07-02T03:19:45Z] INFO: our-app-sends: sent 10 packets, received 10 responses
[2026-07-02T03:19:45Z] INFO: our-app-sends: PASS (sent >= 5 packets)
[2026-07-02T03:19:45Z] INFO: JUnit XML written to: /tmp/test-results/tier3-our-app-sends.xml
[2026-07-02T03:19:45Z] INFO: our-app-sends test complete
⚠️ SSM Command Failures (receiver-ssm-failure.log) 
=== Polling timeout after 30s ===
Status: InProgress
Instance: i-020a499f10a51325e (receiver)
Command ID: 0251661a-b528-426f-b066-7251dcac0433

=== STDOUT ===


=== STDERR ===


=== Polling timeout after 30s ===
Status: InProgress
Instance: i-020a499f10a51325e (receiver)
Command ID: 10672e8d-9696-406d-8193-ca8b590ceaed

=== STDOUT ===


=== STDERR ===


=== Polling timeout after 30s ===
Status: InProgress
Instance: i-020a499f10a51325e (receiver)
Command ID: 118a00d4-e1a9-41a2-b380-90206af19457

=== STDOUT ===


=== STDERR ===


=== Polling timeout after 30s ===
Status: InProgress
Instance: i-020a499f10a51325e (receiver)
Command ID: 0ae170de-d3fc-4b9b-a8ec-7781a510234e

=== STDOUT ===


=== STDERR ===
⚠️ SSM Command Failures (sender-ssm-failure.log) 
=== Polling timeout after 30s ===
Status: InProgress
Instance: i-0a7cb2096637b548b (sender)
Command ID: 108ee69c-268d-4280-9273-49d8299def60

=== STDOUT ===


=== STDERR ===
Network & PCI State

receiver-network-interfaces.log

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
    link/ether 02:35:d5:cb:38:ab brd ff:ff:ff:ff:ff:ff
    altname enp0s5
    altname eni-0f3a836764fe46ca5
    altname device-number-0.0
    inet 10.0.1.169/24 metric 512 brd 10.0.1.255 scope global dynamic ens5
       valid_lft 2106sec preferred_lft 2106sec
    inet6 fe80::35:d5ff:fecb:38ab/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

sender-network-interfaces.log

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
    link/ether 02:a7:e3:21:68:5f brd ff:ff:ff:ff:ff:ff
    altname enp0s5
    altname eni-02683aca53dafbe7a
    altname device-number-0.0
    inet 10.0.1.219/24 metric 512 brd 10.0.1.255 scope global dynamic ens5
       valid_lft 2128sec preferred_lft 2128sec
    inet6 fe80::a7:e3ff:fe21:685f/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

receiver-networking-diag-baseline.txt

=== NETWORKING DIAGNOSTICS ===
timestamp: 2026-07-02T03:09:24Z
hostname: ip-10-0-1-169.ec2.internal
kernel: 6.18.35-68.129.amzn2023.x86_64

=== DPDK PORT STATUS ===

Network devices using DPDK-compatible driver
============================================
0000:00:06.0 'Elastic Network Adapter (ENA) ec20' drv=vfio-pci unused=ena

Network devices using kernel driver
===================================
0000:00:05.0 'Elastic Network Adapter (ENA) ec20' if=ens5 drv=ena unused=vfio-pci *Active*

No 'Baseband' devices detected
==============================

No 'Crypto' devices detected
============================

No 'DMA' devices detected
=========================

No 'Eventdev' devices detected
==============================

No 'Mempool' devices detected
=============================

No 'Compress' devices detected
==============================

No 'Misc (rawdev)' devices detected
===================================

No 'Regex' devices detected
===========================

=== IP ADDRESSES ===
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
    link/ether 02:35:d5:cb:38:ab brd ff:ff:ff:ff:ff:ff
    altname enp0s5
    altname eni-0f3a836764fe46ca5
    altname device-number-0.0
    inet 10.0.1.169/24 metric 512 brd 10.0.1.255 scope global dynamic ens5
       valid_lft 3084sec preferred_lft 3084sec
    inet6 fe80::35:d5ff:fecb:38ab/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

=== ARP TABLE ===
10.0.1.1 dev ens5 lladdr 02:f6:4f:f2:9e:77 REACHABLE 
10.0.1.217 dev ens5 lladdr 02:81:89:2b:13:bd REACHABLE 
10.0.1.32 dev ens5 lladdr 02:ae:40:b6:49:eb REACHABLE 

=== ROUTE TABLE ===
default via 10.0.1.1 dev ens5 proto dhcp src 10.0.1.169 metric 512 
10.0.0.2 via 10.0.1.1 dev ens5 proto dhcp src 10.0.1.169 metric 512 
10.0.1.0/24 dev ens5 proto kernel scope link src 10.0.1.169 metric 512 
10.0.1.1 dev ens5 proto dhcp scope link src 10.0.1.169 metric 512 

=== IMDS: ENI INFORMATION ===
ENI MACs found: 02:35:d5:cb:38:ab/ 02:ae:31:66:d7:c9/ 

--- ENI: 02:35:d5:cb:38:ab/ ---
  device-number: 0
  local-ipv4s: 10.0.1.169
  subnet-id: subnet-0313bb9f1b54fc390
  subnet-cidr: 10.0.1.0/24

--- ENI: 02:ae:31:66:d7:c9/ ---
  device-number: 1
  local-ipv4s: 10.0.1.122
  subnet-id: subnet-0313bb9f1b54fc390
  subnet-cidr: 10.0.1.0/24


=== GATEWAY ARP TEST ===
Gateway IP: 10.0.1.1
Gateway ARP entry:
10.0.1.1 dev ens5 lladdr 02:f6:4f:f2:9e:77 REACHABLE 

arping result:
ARPING 10.0.1.1 from 10.0.1.169 ens5
Unicast reply from 10.0.1.1 [02:F6:4F:F2:9E:77]  0.540ms
Sent 1 probes (1 broadcast(s))
Received 1 response(s)

=== HUGEPAGE STATUS ===
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
FileHugePages:     51200 kB
HugePages_Total:    1024
HugePages_Free:     1024
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:         2097152 kB

=== VFIO STATUS ===
total 0
drwxr-xr-x.  2 root root       80 Jul  2 03:09 .
drwxr-xr-x. 14 root root     3100 Jul  2 03:08 ..
crw-------.  1 root root 243,   0 Jul  2 03:09 noiommu-0
crw-rw-rw-.  1 root root  10, 196 Jul  2 03:00 vfio

noiommu mode:
Y

=== DPDK SHARED MEMORY ===
no /var/run/dpdk/ directory (clean state)

=== DPDK-RELATED DMESG (last 30 lines) ===
[    0.053534] printk: legacy console [ttyS0] enabled
[    0.054552] x2apic enabled
[    0.058704] mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto
[    0.058812] x86/fpu: Enabled xstate features 0x2ff, context size is 2568 bytes, using 'compacted' format.
[    0.068603] audit: type=2000 audit(1782961244.048:1): state=initialized audit_enabled=0 res=1
[    0.088071] kprobes: kprobe jump-optimization is enabled. All kprobes are optimized if possible.
[    0.138283] ACPI: Interpreter enabled
[    0.138409] ACPI: Enabled 2 GPEs in block 00 to 0F
[    0.155721] pci 0000:00:05.0: enabling Extended Tags
[    0.243881] SGI XFS with ACLs, security attributes, quota, no debug enabled
[    0.249445] ACPI: \_SB_.LNKD: Enabled at IRQ 11
[    0.359146] IPI shorthand broadcast: enabled
[    2.537174] systemd[1]: Mounting dev-hugepages.mount - Huge Pages File System...
[    2.587092] systemd[1]: Mounted dev-hugepages.mount - Huge Pages File System.
[    2.623995] VFIO - User Level meta-driver version: 0.3
[    3.043372] ena 0000:00:05.0: Elastic Network Adapter (ENA) v2.17.1g
[    3.054700] ena 0000:00:05.0: ENA device version: 0.10
[    3.055392] ena 0000:00:05.0: ENA controller version: 0.0.1 implementation version 1
[    3.162009] ena 0000:00:05.0: ENA Large LLQ is disabled
[    3.174990] ena 0000:00:05.0: Elastic Network Adapter (ENA) found at mem c0500000, mac addr 02:35:d5:cb:38:ab
[    3.195464] ena 0000:00:05.0 ens5: renamed from eth0
[  472.213470] pci 0000:00:06.0: enabling Extended Tags
[  472.217367] ena 0000:00:06.0: enabling device (0000 -> 0002)
[  472.226815] ena 0000:00:06.0: ENA device version: 0.10
[  472.227581] ena 0000:00:06.0: ENA controller version: 0.0.1 implementation version 1
[  472.326787] ena 0000:00:06.0: ENA Large LLQ is disabled
[  472.338734] ena 0000:00:06.0: Elastic Network Adapter (ENA) found at mem c0508000, mac addr 02:ae:31:66:d7:c9
[  472.346003] ena 0000:00:06.0 ens6: renamed from eth0
[  508.173117] vfio-pci 0000:00:06.0: Adding to iommu group 0
[  508.174567] vfio-pci 0000:00:06.0: Adding kernel taint for vfio-noiommu group on device

=== DPDK-RELATED PROCESSES ===
no DPDK processes running

=== END DIAGNOSTICS ===

sender-networking-diag-baseline.txt

=== NETWORKING DIAGNOSTICS ===
timestamp: 2026-07-02T03:09:17Z
hostname: ip-10-0-1-219.ec2.internal
kernel: 6.18.35-68.129.amzn2023.x86_64

=== DPDK PORT STATUS ===

Network devices using DPDK-compatible driver
============================================
0000:00:06.0 'Elastic Network Adapter (ENA) ec20' drv=vfio-pci unused=ena

Network devices using kernel driver
===================================
0000:00:05.0 'Elastic Network Adapter (ENA) ec20' if=ens5 drv=ena unused=vfio-pci *Active*

No 'Baseband' devices detected
==============================

No 'Crypto' devices detected
============================

No 'DMA' devices detected
=========================

No 'Eventdev' devices detected
==============================

No 'Mempool' devices detected
=============================

No 'Compress' devices detected
==============================

No 'Misc (rawdev)' devices detected
===================================

No 'Regex' devices detected
===========================

=== IP ADDRESSES ===
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
    link/ether 02:a7:e3:21:68:5f brd ff:ff:ff:ff:ff:ff
    altname enp0s5
    altname eni-02683aca53dafbe7a
    altname device-number-0.0
    inet 10.0.1.219/24 metric 512 brd 10.0.1.255 scope global dynamic ens5
       valid_lft 3092sec preferred_lft 3092sec
    inet6 fe80::a7:e3ff:fe21:685f/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

=== ARP TABLE ===
10.0.1.1 dev ens5 lladdr 02:f6:4f:f2:9e:77 REACHABLE 
10.0.1.32 dev ens5 lladdr 02:ae:40:b6:49:eb REACHABLE 

=== ROUTE TABLE ===
default via 10.0.1.1 dev ens5 proto dhcp src 10.0.1.219 metric 512 
10.0.0.2 via 10.0.1.1 dev ens5 proto dhcp src 10.0.1.219 metric 512 
10.0.1.0/24 dev ens5 proto kernel scope link src 10.0.1.219 metric 512 
10.0.1.1 dev ens5 proto dhcp scope link src 10.0.1.219 metric 512 

=== IMDS: ENI INFORMATION ===
ENI MACs found: 02:a5:ba:4c:23:4b/ 02:a7:e3:21:68:5f/ 

--- ENI: 02:a5:ba:4c:23:4b/ ---
  device-number: 1
  local-ipv4s: 10.0.1.126
  subnet-id: subnet-0313bb9f1b54fc390
  subnet-cidr: 10.0.1.0/24

--- ENI: 02:a7:e3:21:68:5f/ ---
  device-number: 0
  local-ipv4s: 10.0.1.219
  subnet-id: subnet-0313bb9f1b54fc390
  subnet-cidr: 10.0.1.0/24


=== GATEWAY ARP TEST ===
Gateway IP: 10.0.1.1
Gateway ARP entry:
10.0.1.1 dev ens5 lladdr 02:f6:4f:f2:9e:77 REACHABLE 

arping result:
ARPING 10.0.1.1 from 10.0.1.219 ens5
Unicast reply from 10.0.1.1 [02:F6:4F:F2:9E:77]  0.537ms
Sent 1 probes (1 broadcast(s))
Received 1 response(s)

=== HUGEPAGE STATUS ===
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
FileHugePages:     51200 kB
HugePages_Total:    1024
HugePages_Free:     1024
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
Hugetlb:         2097152 kB

=== VFIO STATUS ===
total 0
drwxr-xr-x.  2 root root       80 Jul  2 03:09 .
drwxr-xr-x. 14 root root     3100 Jul  2 03:08 ..
crw-------.  1 root root 243,   0 Jul  2 03:09 noiommu-0
crw-rw-rw-.  1 root root  10, 196 Jul  2 03:00 vfio

noiommu mode:
Y

=== DPDK SHARED MEMORY ===
no /var/run/dpdk/ directory (clean state)

=== DPDK-RELATED DMESG (last 30 lines) ===
[    0.054225] printk: legacy console [ttyS0] enabled
[    0.055241] x2apic enabled
[    0.059433] mitigations: Enabled attack vectors: user_kernel, user_user, guest_host, guest_guest, SMT mitigations: auto
[    0.059543] x86/fpu: Enabled xstate features 0x2ff, context size is 2568 bytes, using 'compacted' format.
[    0.069328] audit: type=2000 audit(1782961244.089:1): state=initialized audit_enabled=0 res=1
[    0.088780] kprobes: kprobe jump-optimization is enabled. All kprobes are optimized if possible.
[    0.141496] ACPI: Interpreter enabled
[    0.141496] ACPI: Enabled 2 GPEs in block 00 to 0F
[    0.158835] pci 0000:00:05.0: enabling Extended Tags
[    0.224066] SGI XFS with ACLs, security attributes, quota, no debug enabled
[    0.247583] ACPI: \_SB_.LNKD: Enabled at IRQ 11
[    0.349721] IPI shorthand broadcast: enabled
[    3.268172] systemd[1]: Mounting dev-hugepages.mount - Huge Pages File System...
[    3.312221] systemd[1]: Mounted dev-hugepages.mount - Huge Pages File System.
[    3.359614] VFIO - User Level meta-driver version: 0.3
[    3.799889] ena 0000:00:05.0: Elastic Network Adapter (ENA) v2.17.1g
[    3.815571] ena 0000:00:05.0: ENA device version: 0.10
[    3.816479] ena 0000:00:05.0: ENA controller version: 0.0.1 implementation version 1
[    3.924650] ena 0000:00:05.0: ENA Large LLQ is disabled
[    3.937059] ena 0000:00:05.0: Elastic Network Adapter (ENA) found at mem c0500000, mac addr 02:a7:e3:21:68:5f
[    3.961149] ena 0000:00:05.0 ens5: renamed from eth0
[  452.339808] pci 0000:00:06.0: enabling Extended Tags
[  452.343833] ena 0000:00:06.0: enabling device (0000 -> 0002)
[  452.357242] ena 0000:00:06.0: ENA device version: 0.10
[  452.357999] ena 0000:00:06.0: ENA controller version: 0.0.1 implementation version 1
[  452.459173] ena 0000:00:06.0: ENA Large LLQ is disabled
[  452.472326] ena 0000:00:06.0: Elastic Network Adapter (ENA) found at mem c0508000, mac addr 02:a5:ba:4c:23:4b
[  452.479974] ena 0000:00:06.0 ens6: renamed from eth0
[  501.535419] vfio-pci 0000:00:06.0: Adding to iommu group 0
[  501.536834] vfio-pci 0000:00:06.0: Adding kernel taint for vfio-noiommu group on device

=== DPDK-RELATED PROCESSES ===
no DPDK processes running

=== END DIAGNOSTICS ===
⚠️ Crash Diagnostics

receiver-dmesg-crashes.log

[    0.067966] pid_max: default: 32768 minimum: 301
[    0.159578] iommu: Default domain type: Translated
[    0.164755] NetLabel:  unlabeled traffic allowed by default
[    0.187424] PCI: CLS 0 bytes, default 64
[    0.270592] nvme nvme0: 2/0/0 default/read/poll queues
[    0.440351] systemd[1]: systemd 252.23-12.amzn2023 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +TPM2 -BZIP2 -LZ4 +XZ +ZLIB -ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
[    0.440477] systemd[1]: No hostname configured, using default hostname.
[    0.547380] systemd[1]: Queued start job for default target initrd.target.
[    2.037175] systemd[1]: systemd 252.23-12.amzn2023 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +TPM2 -BZIP2 -LZ4 +XZ +ZLIB -ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
[  543.408753] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:8353)
[  751.095236] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:8790)
[ 1360.924916] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:9962)

sender-dmesg-crashes.log

[    0.068685] pid_max: default: 32768 minimum: 301
[    0.162735] iommu: Default domain type: Translated
[    0.162762] NetLabel:  unlabeled traffic allowed by default
[    0.178719] PCI: CLS 0 bytes, default 64
[    0.265026] nvme nvme0: 2/0/0 default/read/poll queues
[    0.439050] systemd[1]: systemd 252.23-12.amzn2023 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +TPM2 -BZIP2 -LZ4 +XZ +ZLIB -ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
[    0.439175] systemd[1]: No hostname configured, using default hostname.
[    0.498401] systemd[1]: Queued start job for default target initrd.target.
[    2.685278] systemd[1]: systemd 252.23-12.amzn2023 running in system mode (+PAM +AUDIT +SELINUX -APPARMOR +IMA +SMACK +SECCOMP -GCRYPT -GNUTLS +OPENSSL +ACL +BLKID +CURL +ELFUTILS +FIDO2 +IDN2 -IDN -IPTC +KMOD +LIBCRYPTSETUP +LIBFDISK +PCRE2 +PWQUALITY +P11KIT +QRENCODE +TPM2 -BZIP2 -LZ4 +XZ +ZLIB -ZSTD +BPF_FRAMEWORK +XKBCOMMON +UTMP +SYSVINIT default-hierarchy=unified)
[ 1181.678809] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:9617)
Kernel Console (dmesg)

receiver-console-output.log (PCI/driver events only)

[  543.407219] vfio-pci 0000:00:06.0: reset done
[  543.408753] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:8353)
[  543.410152] vfio-pci 0000:00:06.0: resetting
[  543.627089] vfio-pci 0000:00:06.0: reset done
[  621.069804] vfio-pci 0000:00:06.0: Removing from iommu group 0
[  622.082779] ena 0000:00:06.0: ENA device version: 0.10
[  622.083542] ena 0000:00:06.0: ENA controller version: 0.0.1 implementation version 1
[  622.184259] ena 0000:00:06.0: ENA Large LLQ is disabled
[  622.196192] ena 0000:00:06.0: Elastic Network Adapter (ENA) found at mem c0508000, mac addr 02:ae:31:66:d7:c9
[  622.203914] ena 0000:00:06.0 ens6: renamed from eth0
[  641.599162] vfio-pci 0000:00:06.0: Adding to iommu group 0
[  641.600393] vfio-pci 0000:00:06.0: Adding kernel taint for vfio-noiommu group on device
[  750.874681] vfio-pci 0000:00:06.0: resetting
[  751.093708] vfio-pci 0000:00:06.0: reset done
[  751.095236] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:8790)
[  751.096642] vfio-pci 0000:00:06.0: resetting
[  751.313584] vfio-pci 0000:00:06.0: reset done
[  823.173427] vfio-pci 0000:00:06.0: Removing from iommu group 0
[  824.186246] ena 0000:00:06.0: ENA device version: 0.10
[  824.186991] ena 0000:00:06.0: ENA controller version: 0.0.1 implementation version 1
[  824.288138] ena 0000:00:06.0: ENA Large LLQ is disabled
[  824.301441] ena 0000:00:06.0: Elastic Network Adapter (ENA) found at mem c0508000, mac addr 02:ae:31:66:d7:c9
[  824.308838] ena 0000:00:06.0 ens6: renamed from eth0
[ 1289.377616] vfio-pci 0000:00:06.0: Adding to iommu group 0
[ 1289.379052] vfio-pci 0000:00:06.0: Adding kernel taint for vfio-noiommu group on device
[ 1360.697362] vfio-pci 0000:00:06.0: resetting
[ 1360.923382] vfio-pci 0000:00:06.0: reset done
[ 1360.924916] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (echo:9962)
[ 1360.926323] vfio-pci 0000:00:06.0: resetting
[ 1361.143227] vfio-pci 0000:00:06.0: reset done

sender-console-output.log (PCI/driver events only)

[ 1181.680206] vfio-pci 0000:00:06.0: resetting
[ 1181.897161] vfio-pci 0000:00:06.0: reset done
[ 1252.964298] vfio-pci 0000:00:06.0: Removing from iommu group 0
[ 1253.975002] ena 0000:00:06.0: ENA device version: 0.10
[ 1253.975756] ena 0000:00:06.0: ENA controller version: 0.0.1 implementation version 1
[ 1254.074975] ena 0000:00:06.0: ENA Large LLQ is disabled
[ 1254.087254] ena 0000:00:06.0: Elastic Network Adapter (ENA) found at mem c0508000, mac addr 02:a5:ba:4c:23:4b
[ 1254.095983] ena 0000:00:06.0 ens6: renamed from eth0
[ 1282.859093] vfio-pci 0000:00:06.0: Adding to iommu group 0
[ 1282.860365] vfio-pci 0000:00:06.0: Adding kernel taint for vfio-noiommu group on device
[ 1376.451462] vfio-pci 0000:00:06.0: resetting
[ 1376.665832] vfio-pci 0000:00:06.0: reset done
[ 1376.667411] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (tokio-rt-worker:10060)
[ 1376.669025] vfio-pci 0000:00:06.0: resetting
[ 1376.885669] vfio-pci 0000:00:06.0: reset done
[ 1377.173896] vfio-pci 0000:00:06.0: resetting
[ 1377.395711] vfio-pci 0000:00:06.0: reset done
[ 1377.397264] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (tokio-rt-worker:10080)
[ 1377.398847] vfio-pci 0000:00:06.0: resetting
[ 1377.615659] vfio-pci 0000:00:06.0: reset done
[ 1378.905876] vfio-pci 0000:00:06.0: resetting
[ 1379.125645] vfio-pci 0000:00:06.0: reset done
[ 1379.127201] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (tokio-rt-worker:10103)
[ 1379.128804] vfio-pci 0000:00:06.0: resetting
[ 1379.345615] vfio-pci 0000:00:06.0: reset done
[ 1380.636267] vfio-pci 0000:00:06.0: resetting
[ 1380.845637] vfio-pci 0000:00:06.0: reset done
[ 1380.847198] vfio-pci 0000:00:06.0: vfio-noiommu device opened by user (tokio-rt-worker:10126)
[ 1380.848819] vfio-pci 0000:00:06.0: resetting
[ 1381.065630] vfio-pci 0000:00:06.0: reset done

@gspivey gspivey mentioned this pull request Jul 2, 2026
Open
@github-actions github-actions Bot mentioned this pull request Jul 2, 2026
Closed
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@gspivey