Update dynamic threshold for Q1/Q2/Q3 egress lossy profiles and for Backend types#27036
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kperumalbfn merged 2 commits intoMay 1, 2026
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Pull request overview
Updates Arista 7060X6-64PE buffer default templates to increase egress lossy queue headroom (Q1/Q2/Q3) and to extend queue-profile selection logic to additional device/neighbor roles.
Changes:
- Increased
dynamic_thfor Q1/Q2/Q3 egress lossy profiles from-7to3(uplink + downlink) in T0/T1 buffer defaults. - Expanded
DEVICE_METADATA['localhost'].typeand neighbor-type checks to include backend roles when choosing uplink vs downlink queue profiles.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.
| File | Description |
|---|---|
| device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-C512S2/buffers_defaults_t1.j2 | Raises Q1–Q3 dynamic thresholds; extends role-based queue profile selection logic. |
| device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-C512S2/buffers_defaults_t0.j2 | Same threshold/role logic updates as T1 for T0 template. |
| device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-C448O16/buffers_defaults_t1.j2 | Raises Q1–Q3 dynamic thresholds; extends neighbor-role matching (incl. backend). |
| device/arista/x86_64-arista_7060x6_64pe_b/Arista-7060X6-64PE-B-C448O16/buffers_defaults_t0.j2 | Same threshold/role logic updates as T1 for T0 template. |
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r12f
approved these changes
May 1, 2026
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Cherry-pick PR to 202511: #27141 |
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May 7, 2026
…ackend types (sonic-net#27036) Update dynamic threshold for Q1/Q2/Q3 egress lossy profiles and for Backend types Signed-off-by: mhchann <mhchann082@gmail.com>
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Cherry-pick PR to msft-202412: Azure/sonic-buildimage-msft#2271 |
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@kperumalbfn cherry pick PR didn't pass PR checker after retry. Please help check! Thanks. ---Powered by SONiC BuildBot
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Why I did it
Update the alpha values for Q1/Q2/Q3 egress profiles to provide more buffers for the traffic.
Update the egress queue profiles for all ToR/Leaf switches
Work item tracking
Microsoft ADO (number only):
37712828
How I did it
Updated the dynamic threshold values for Q1/Q2/Q3 lossy queues.
How to verify it
Generated the values after updating T0/T1 Ninja templates using 'config qos reload'
Which release branch to backport (provide reason below if selected)
[x] 202411
[x] 202505
[x] 202511