#!/bin/bash
# 查还有哪些内核网络调优可用（只读）
set -u

echo "════════ 1. 排队规则（qdisc）候选 ════════"
echo "  当前: $(sysctl -n net.core.default_qdisc)"
echo "  内核里有没有 fq / fq_codel / cake:"
find /lib/modules/$(uname -r)/kernel/net/sched/ -name '*.ko*' 2>/dev/null \
    | xargs -n1 basename 2>/dev/null | grep -iE 'fq|codel|cake|htb|tbf' | head -10 | sed 's/^/    /'
echo "  已加载的相关模块:"
lsmod 2>/dev/null | grep -iE 'fq|codel|cake|sch_' | sed 's/^/    /' || echo "    （没有）"
echo "  ---"
echo "  试加载 fq_codel（-n = 只检查不真加载）:"
modprobe -n sch_fq_codel 2>&1 | head -2 | sed 's/^/    /'
echo "  试加载 fq:"
modprobe -n sch_fq 2>&1 | head -2 | sed 's/^/    /'

echo
echo "════════ 2. 现在的 qdisc 长什么样 ════════"
tc qdisc show dev wlan0 2>/dev/null | sed 's/^/  /' || echo "  （tc 没装）"

echo
echo "════════ 3. TCP 重传相关的可调项（当前值）════════"
for k in tcp_retries1 tcp_retries2 tcp_rto_min tcp_rto_max tcp_recovery \
         tcp_early_retrans tcp_fack tcp_thin_linear_timeouts tcp_abort_on_overflow \
         tcp_limit_output_bytes tcp_moderate_rcvbuf tcp_autocorking; do
    v=$(sysctl -n net.ipv4.$k 2>/dev/null)
    [ -n "$v" ] && printf "  %-38s = %s\n" "$k" "$v"
done

echo
echo "════════ 4. 这些项的合法范围 ════════"
ls /proc/sys/net/ipv4/ 2>/dev/null | grep -E '^tcp_(retries|rto|recovery|early|fack|thin|abort|limit|moderate|autocork)' | sed 's/^/  /'

echo
echo "════════ 5. 丢包/重传的实时增量（10 秒采样）════════"
a=$(netstat -s 2>/dev/null | grep -E 'TCPTimeouts|segments retransmitted|TCPLostRetransmit' | awk '{s+=$1} END {print s}')
sleep 10
b=$(netstat -s 2>/dev/null | grep -E 'TCPTimeouts|segments retransmitted|TCPLostRetransmit' | awk '{s+=$1} END {print s}')
echo "  10 秒内新增重传/超时相关计数: $((b - a))"

echo
echo "════════ 6. 基线测量还在跑吗 ════════"
pgrep -af 'bench.sh' | head -2 | sed 's/^/  /' || echo "  已结束"
if [ -f /root/bench_baseline.txt ]; then
    echo "  已写入的行数: $(wc -l < /root/bench_baseline.txt)"
    echo "  最近几行:"
    tail -6 /root/bench_baseline.txt | sed 's/^/    /'
fi