Create apply_settings.sh

src/apply_settings.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+source /src/config.sh
+
+apply_best_settings() {
+    read -r _ cc qdisc tc rtt loss jitter throughput syn_time <<< "$1"
+
+    TCPMAXSEG=$(ip link show $INTERFACE | awk '/mtu/ {print $5-40}')
+    TCP_FAST_OPEN=3
+    KEEP_ALIVE_INTERVAL=$(echo "scale=0; $rtt / 1000" | bc)
+    KEEP_ALIVE_IDLE=$(echo "scale=0; $KEEP_ALIVE_INTERVAL * 10" | bc)
+    TCP_USER_TIMEOUT=$(echo "scale=0; $rtt * 3" | bc)
+    TCP_CONGESTION=$cc
+    WINDOW_CLAMP=$(echo "scale=0; $throughput * 1000 * $rtt / 8" | bc)
+
+    sysctl -w net.ipv4.tcp_congestion_control=$TCP_CONGESTION
+    sysctl -w net.ipv4.tcp_fastopen=$TCP_FAST_OPEN
+    sysctl -w net.ipv4.tcp_keepalive_time=$KEEP_ALIVE_IDLE
+    sysctl -w net.ipv4.tcp_keepalive_intvl=$KEEP_ALIVE_INTERVAL
+    sysctl -w net.ipv4.tcp_keepalive_probes=3
+    sysctl -w net.ipv4.tcp_user_timeout=$TCP_USER_TIMEOUT
+    sysctl -w net.ipv4.tcp_window_scaling=1
+    sysctl -w net.core.rmem_max=$WINDOW_CLAMP
+    sysctl -w net.core.wmem_max=$WINDOW_CLAMP
+    sysctl -w net.ipv4.tcp_rmem="4096 87380 $WINDOW_CLAMP"
+    sysctl -w net.ipv4.tcp_wmem="4096 87380 $WINDOW_CLAMP"
+    sysctl -w net.ipv4.tcp_mtu_probing=1
+    sysctl -w net.ipv4.tcp_slow_start_after_idle=0
+    sysctl -w net.ipv4.tcp_tw_reuse=1
+    sysctl -w net.ipv4.tcp_max_syn_backlog=8192
+    sysctl -w net.ipv4.tcp_synack_retries=2
+    sysctl -w net.ipv4.tcp_syn_retries=2
+    sysctl -w net.ipv4.tcp_max_tw_buckets=2000000
+    sysctl -w net.ipv4.tcp_fin_timeout=10
+    sysctl -w net.core.netdev_max_backlog=16384
+    sysctl -w net.ipv4.tcp_notsent_lowat=16384
+    sysctl -w net.ipv4.tcp_no_metrics_save=1
+    sysctl -w net.ipv4.tcp_moderate_rcvbuf=1
+    sysctl -w net.ipv4.tcp_timestamps=1
+    sysctl -w net.ipv4.tcp_sack=1
+    sysctl -w net.ipv4.tcp_fack=1
+    sysctl -w net.ipv4.tcp_ecn=1
+    sysctl -w net.ipv4.tcp_dsack=1
+    sysctl -w net.ipv4.tcp_low_latency=1
+    sysctl -w net.ipv4.ip_no_pmtu_disc=0
+    sysctl -w net.ipv4.tcp_adv_win_scale=2
+    sysctl -w net.ipv4.tcp_rfc1337=1
+    sysctl -w net.ipv4.tcp_abort_on_overflow=0
+    sysctl -w net.ipv4.tcp_thin_linear_timeouts=1
+    sysctl -w net.ipv4.tcp_limit_output_bytes=262144
+
+    if [ -f /proc/sys/net/mptcp/enabled ]; then
+        sysctl -w net.mptcp.enabled=1
+        sysctl -w net.mptcp.checksum_enabled=1
+    fi
+
+    tc qdisc replace dev $INTERFACE root $qdisc
+    [ "$tc" != "none" ] && tc qdisc add dev $INTERFACE root netem $tc
+
+    ip route change default via $(ip route | awk '/default/ {print $3}') dev $INTERFACE proto static initcwnd 10 initrwnd 10 advmss $TCPMAXSEG rto_min 1000 quickack 1
+
+    echo "Applied TCP settings:"
+    echo "tcpMaxSeg = $TCPMAXSEG"
+    echo "tcpFastOpen = $TCP_FAST_OPEN"
+    echo "tcpKeepAliveInterval = $KEEP_ALIVE_INTERVAL"
+    echo "tcpKeepAliveIdle = $KEEP_ALIVE_IDLE"
+    echo "tcpUserTimeout = $TCP_USER_TIMEOUT"
+    echo "tcpcongestion = \"$TCP_CONGESTION\""
+    echo "windowClamp = $WINDOW_CLAMP"
+    echo "Queueing Discipline: $qdisc"
+    echo "TC Settings: $tc"
+}