diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c1892da..ed09d46 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -81,7 +81,7 @@ jobs:
             autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev \
             gawk build-essential bison flex texinfo gperf libtool patchutils bc \
             zlib1g-dev libexpat1-dev pkg-config libglib2.0-dev libpixman-1-dev libsdl2-dev libslirp-dev \
-            python3 python3-pip ninja-build
+            python3 python3-pip ninja-build e2fsprogs
 
       - name: 📥 Cache QEMU Build and Installation
         uses: actions/cache@v4
diff --git a/data/iperf_testcode_comix.sh b/data/iperf_testcode_comix.sh
deleted file mode 100755
index 9ce7189..0000000
--- a/data/iperf_testcode_comix.sh
+++ /dev/null
@@ -1,100 +0,0 @@
-#!/bin/sh
-#
-# Comix-friendly iperf3 test script.
-#
-# Differences vs data/iperf_testcode.sh:
-# - Avoids `-D` (daemon mode) which is fragile on minimal userlands.
-# - Uses `-1` (one-off) and runs server in background per test case.
-# - Redirects logs to /tmp to keep console clean and help debugging.
-#
-
-host="${HOST:-127.0.0.1}"
-port="${PORT:-5001}"
-iperf="${IPERF:-iperf3}"
-
-# Keep consistent with the original test intent: extremely high send rate for UDP.
-udp_bw="${UDP_BW:-1000G}"
-duration="${DURATION:-2}"
-parallel="${PARALLEL:-5}"
-
-mkdir -p /tmp
-
-echo "#### OS COMP TEST GROUP START iperf ####"
-
-pass=0
-fail=0
-
-run_case() {
-    name="$1"
-    server_args="$2"
-    client_args="$3"
-
-    s_log="/tmp/iperf3_${name}_s.log"
-    c_log="/tmp/iperf3_${name}_c.log"
-    rm -rf "$s_log" "$c_log"
-
-    echo "====== iperf $name begin ======"
-
-    # Best-effort cleanup from previous runs.
-    killall iperf3 2>/dev/null
-
-    # Start one-off server in background.
-    $iperf $server_args >"$s_log" 2>&1 &
-    s_pid=$!
-
-    # Give server time to bind/listen.
-    sleep 1
-
-    # Run client in foreground to capture return code.
-    $iperf $client_args >"$c_log" 2>&1
-    rc=$?
-
-    # Best-effort: don't hang forever if server doesn't exit.
-    sleep 1
-    if kill -0 "$s_pid" 2>/dev/null; then
-        kill "$s_pid" 2>/dev/null
-        sleep 1
-        kill -9 "$s_pid" 2>/dev/null
-    fi
-    killall iperf3 2>/dev/null
-
-    if [ "$rc" -eq 0 ]; then
-        ans="success"
-        pass=$((pass + 1))
-    else
-        ans="fail"
-        fail=$((fail + 1))
-    fi
-
-    echo "====== iperf $name end: $ans (rc=$rc) ======"
-    echo "  server_log=$s_log"
-    echo "  client_log=$c_log"
-    echo ""
-}
-
-# Server template
-srv_base="-s -4 -p $port -1"
-
-# Client template
-cli_base="-4 -c $host -p $port -t $duration -i 0"
-
-# basic test
-run_case "BASIC_UDP" "$srv_base" "$cli_base -u -b $udp_bw"
-run_case "BASIC_TCP" "$srv_base" "$cli_base"
-
-# parallel test
-run_case "PARALLEL_UDP" "$srv_base" "$cli_base -u -P $parallel -b $udp_bw"
-run_case "PARALLEL_TCP" "$srv_base" "$cli_base -P $parallel"
-
-# reverse test (server sends, client receives)
-run_case "REVERSE_UDP" "$srv_base" "$cli_base -u -R -b $udp_bw"
-run_case "REVERSE_TCP" "$srv_base" "$cli_base -R"
-
-echo "#### OS COMP TEST GROUP END iperf ####"
-echo "iperf summary: pass=$pass fail=$fail"
-
-# Exit non-zero if any case failed (friendlier for CI)
-if [ "$fail" -ne 0 ]; then
-    exit 1
-fi
-exit 0
diff --git a/data/netperf_testcode.sh b/data/netperf_testcode.sh
deleted file mode 100755
index 4e945db..0000000
--- a/data/netperf_testcode.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/sh
-
-ip="${IP:-127.0.0.1}"
-port="${PORT:-12865}"
-
-/bin/busybox echo "#### OS COMP TEST GROUP START netperf-musl ####"
-
-run_netperf() {
-    echo "====== netperf $1 begin ======"
-    /bin/netperf -H "$ip" -p "$port" -t "$1" -l 1 -- $2
-    if [ $? = 0 ]; then
-        ans="success"
-    else
-        ans="fail"
-    fi
-    echo "====== netperf $1 end: $ans ======"
-}
-
-/bin/netserver -D -L "$ip" -p "$port" &
-server_pid=$!
-
-run_netperf UDP_STREAM "-s 16k -S 16k -m 1k -M 1k"
-run_netperf TCP_STREAM "-s 16k -S 16k -m 1k -M 1k"
-run_netperf UDP_RR "-s 16k -S 16k -m 1k -M 1k -r 64,64 -R 1"
-run_netperf TCP_RR "-s 16k -S 16k -m 1k -M 1k -r 64,64 -R 1"
-run_netperf TCP_CRR "-s 16k -S 16k -m 1k -M 1k -r 64,64 -R 1"
-
-kill -9 "$server_pid"
-
-/bin/busybox echo "#### OS COMP TEST GROUP END netperf-musl ####"
diff --git a/data/risc-v_musl/bin/iperf3 b/data/risc-v_musl/bin/iperf3
deleted file mode 100755
index 2944b29..0000000
Binary files a/data/risc-v_musl/bin/iperf3 and /dev/null differ
diff --git a/data/risc-v_musl/bin/netperf b/data/risc-v_musl/bin/netperf
deleted file mode 100755
index c9ccbdf..0000000
Binary files a/data/risc-v_musl/bin/netperf and /dev/null differ
diff --git a/data/risc-v_musl/bin/netserver b/data/risc-v_musl/bin/netserver
deleted file mode 100755
index dd21f0e..0000000
Binary files a/data/risc-v_musl/bin/netserver and /dev/null differ
diff --git a/data/risc-v_musl/iperf_testcode.sh b/data/risc-v_musl/iperf_testcode.sh
deleted file mode 100644
index 5dd9882..0000000
--- a/data/risc-v_musl/iperf_testcode.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-host="127.0.0.1"
-port="5001"
-iperf="iperf3"
-
-
-echo "#### OS COMP TEST GROUP START iperf ####"
-
-
-run_iperf() {
-    name=$1
-    args=$2
-    echo "====== iperf $name begin ======"
-
-    $iperf -c $host -p $port -t 2 -i 0 $args
-    if [ $? == 0 ]; then
-	    ans="success"
-    else
-	    ans="fail"
-    fi
-
-    echo "====== iperf $name end: $ans ======"
-    echo ""
-}
-
-
-#start server
-$iperf -s -p $port -D
-
-#basic test 
-run_iperf "BASIC_UDP" "-u -b 1000G" 
-run_iperf "BASIC_TCP" ""
-
-#parallel test
-run_iperf "PARALLEL_UDP" "-u -P 5 -b 1000G"
-run_iperf "PARALLEL_TCP" "-P 5"
-
-#reverse test (server sends, client recieves)
-run_iperf "REVERSE_UDP" "-u -R -b 1000G"
-run_iperf "REVERSE_TCP" "-R"
-
-
-echo "#### OS COMP TEST GROUP END iperf ####"
\ No newline at end of file
diff --git a/data/tmp/.gitkeep b/data/tmp/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/os/build.rs b/os/build.rs
index 976f6a8..2f67220 100644
--- a/os/build.rs
+++ b/os/build.rs
@@ -98,7 +98,8 @@ fn main() {
 
         if force_rebuild || should_rebuild(&fs_img_path, &dependencies) {
             println!(
-                "cargo:warning=[build.rs] Creating full ext4 runtime image (4GB) at fs.img..."
+                "cargo:warning=[build.rs] Creating full ext4 runtime image at {}...",
+                fs_img_name
             );
             create_full_ext4_image(&fs_img_path, &data_dir, &project_root);
             let _ = fs::write(&arch_stamp, format!("{}\n", arch_key));
@@ -251,11 +252,11 @@ fn create_empty_ext4_image(path: &PathBuf, size_mb: usize) {
 
 /// 创建完整的 ext4 镜像 (包含 data/)
 fn create_full_ext4_image(path: &PathBuf, data_dir: &Path, _project_root: &Path) {
-    const IMG_SIZE_MB: usize = 4096; // 4GB
+    const IMG_SIZE_MB: usize = 512; // 512MB
     const BLOCK_SIZE: usize = 1024 * 1024;
 
     println!(
-        "cargo:warning=[build.rs] Creating {}MB (4GB) full ext4 image at {}",
+        "cargo:warning=[build.rs] Creating {}MB full ext4 image at {}",
         IMG_SIZE_MB,
         path.display()
     );
@@ -299,11 +300,13 @@ fn create_full_ext4_image(path: &PathBuf, data_dir: &Path, _project_root: &Path)
         .arg("4096")
         .arg("-m")
         .arg("0")
+        .arg("-g")
+        .arg("512") // 每组 512 块 (2MB)，确保生成多个块组以避免 ext4_rs bug
+        .arg("-N")
+        .arg("65536") // 显式指定 inode 数量，避免小镜像 inode 不足
         .arg("-d")
         .arg(&temp_root) // 使用临时目录作为根
         .arg(path)
-        .stdout(std::process::Stdio::null())
-        .stderr(std::process::Stdio::null())
         .status()
         .expect("Failed to execute mkfs.ext4");
 
@@ -314,7 +317,7 @@ fn create_full_ext4_image(path: &PathBuf, data_dir: &Path, _project_root: &Path)
     // 5. 清理临时目录
     fs::remove_dir_all(&temp_root).ok();
 
-    println!("cargo:warning=[build.rs] Full ext4 image created successfully (1GB).");
+    println!("cargo:warning=[build.rs] Full ext4 image created successfully ({}MB).", IMG_SIZE_MB);
 }
 
 /// 递归复制目录