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sushen339
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#!/bin/bash
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# tcp调优脚本 v25.10.11
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# 用法:
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# ./tcp.sh 1 启用调优
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# ./tcp.sh 0 还原配置
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# ./tcp.sh 2 对比优化前后的参数
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BACKUP_FILE="/var/backups/tcp_backup_adaptive.conf"
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TUNE_FILE="/etc/sysctl.d/tcp_bbr_adaptive.conf"
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# 检查是否以 root 权限运行
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check_root() {
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if [ "$EUID" -ne 0 ]; then
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echo "✗ 错误: 此脚本需要 root 权限运行"
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echo " 请使用: sudo $0"
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exit 1
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fi
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}
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# 确保备份目录存在
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ensure_backup_dir() {
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local backup_dir
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backup_dir=$(dirname "$BACKUP_FILE")
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if [ ! -d "$backup_dir" ]; then
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mkdir -p "$backup_dir" 2>/dev/null || {
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echo "✗ 无法创建备份目录: $backup_dir"
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exit 1
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}
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fi
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}
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PARAMS=(
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"net.core.default_qdisc"
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"net.ipv4.tcp_congestion_control"
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"net.core.rmem_max"
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"net.core.wmem_max"
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"net.ipv4.tcp_rmem"
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"net.ipv4.tcp_wmem"
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)
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get_sys_info() {
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MEM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
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MEM_BYTES=$((MEM_KB * 1024))
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echo "内存: $((MEM_BYTES/1024/1024)) MB, CPU: $(nproc) 核"
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}
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ask_network_info() {
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# 读取并验证带宽输入
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while true; do
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read -p "最大带宽 (Mbps): " BW
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if [[ "$BW" =~ ^[0-9]+(\.[0-9]+)?$ ]] && (( $(echo "$BW > 0" | bc -l) )); then
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break
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else
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echo "✗ 无效输入，请输入正数 (例如: 100 或 1000)"
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fi
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done
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# 读取并验证 RTT 输入
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while true; do
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read -p "平均延迟 RTT (ms): " RTT
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if [[ "$RTT" =~ ^[0-9]+(\.[0-9]+)?$ ]] && (( $(echo "$RTT > 0" | bc -l) )); then
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break
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else
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echo "✗ 无效输入，请输入正数 (例如: 10 或 50)"
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fi
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done
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BW_BITS=$((BW * 1000000))
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RTT_SEC=$(awk "BEGIN {print $RTT/1000}")
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BDP_BITS=$(awk "BEGIN {print $BW_BITS * $RTT_SEC}")
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BDP_BYTES=$(awk "BEGIN {print int($BDP_BITS/8)}")
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MIN_BUF=$((4*1024*1024))
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MAX_BUF_LIMIT=$((MEM_BYTES/8))
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if [ $BDP_BYTES -lt $MIN_BUF ]; then
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BUF=$MIN_BUF
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elif [ $BDP_BYTES -gt $MAX_BUF_LIMIT ]; then
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BUF=$MAX_BUF_LIMIT
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else
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BUF=$BDP_BYTES
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fi
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo "计算结果:"
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echo " 带宽延迟积 (BDP): $(numfmt --to=iec-i --suffix=B $BDP_BYTES)"
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echo " 缓冲区上限: $(numfmt --to=iec-i --suffix=B $BUF)"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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}
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check_bbr() {
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if ! sysctl net.ipv4.tcp_available_congestion_control 2>/dev/null | grep -qw bbr; then
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echo "⚠️ 未检测到 BBR 支持，尝试加载 tcp_bbr 模块..."
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if modprobe tcp_bbr 2>/dev/null; then
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echo "✓ tcp_bbr 模块加载成功"
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# 添加到开机自动加载
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if [ ! -f /etc/modules-load.d/tcp_bbr.conf ]; then
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echo "tcp_bbr" > /etc/modules-load.d/tcp_bbr.conf
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echo "✓ 已设置 BBR 模块开机自动加载"
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fi
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else
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echo "✗ 内核不支持 BBR，无法加载模块"
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echo " 请确认内核版本 >= 4.9 或更新内核"
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exit 1
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fi
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else
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echo "✓ BBR 支持已启用"
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fi
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}
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apply_tune() {
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check_root
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ensure_backup_dir
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " 系统信息检测"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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get_sys_info
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echo ""
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check_bbr
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echo ""
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " 网络参数配置"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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ask_network_info
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echo ""
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if [ ! -f "$BACKUP_FILE" ]; then
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echo "📋 备份当前参数到 $BACKUP_FILE"
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for p in "${PARAMS[@]}"; do
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echo "$p = $(sysctl -n $p)" >> "$BACKUP_FILE"
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done
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echo "✓ 备份完成"
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else
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echo "ℹ️ 检测到已存在备份文件，跳过备份"
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fi
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echo ""
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echo "📝 生成配置文件: $TUNE_FILE"
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cat > "$TUNE_FILE" <<EOF
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net.core.default_qdisc = fq
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net.ipv4.tcp_congestion_control = bbr
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net.core.rmem_max = $BUF
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net.core.wmem_max = $BUF
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net.ipv4.tcp_rmem = 4096 87380 $BUF
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net.ipv4.tcp_wmem = 4096 65536 $BUF
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EOF
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echo "⚙️ 应用配置..."
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if sysctl -p "$TUNE_FILE" >/dev/null 2>&1; then
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echo "✓ 配置应用成功"
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else
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echo "✗ 配置应用失败"
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exit 1
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fi
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echo ""
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " 当前参数"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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for p in "${PARAMS[@]}"; do
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printf "%-35s %s\n" "$p" "$(sysctl -n $p)"
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done
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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}
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restore_tune() {
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check_root
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if [ ! -f "$BACKUP_FILE" ]; then
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echo "✗ 未找到备份文件: $BACKUP_FILE"
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echo " 无法还原配置"
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exit 1
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fi
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " 还原配置"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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[ -f "$TUNE_FILE" ] && rm -f "$TUNE_FILE" && echo "✓ 已删除调优配置文件"
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echo "⚙️ 还原系统参数..."
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while IFS= read -r line; do
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key=$(echo "$line" | awk -F= '{print $1}' | xargs)
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value=$(echo "$line" | awk -F= '{print $2}' | xargs)
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if [ -n "$key" ] && [ -n "$value" ]; then
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if sysctl -w "$key=$value" >/dev/null 2>&1; then
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echo " ✓ $key"
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else
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echo " ✗ $key (失败)"
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fi
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fi
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done < "$BACKUP_FILE"
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echo ""
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " 当前参数"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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for p in "${PARAMS[@]}"; do
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printf "%-35s %s\n" "$p" "$(sysctl -n $p)"
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done
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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read -p "是否删除备份文件? (y/N): " del_backup
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if [[ "$del_backup" =~ ^[Yy]$ ]]; then
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rm -f "$BACKUP_FILE"
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echo "✓ 已删除备份文件"
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else
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echo "ℹ️ 保留备份文件: $BACKUP_FILE"
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fi
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}
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compare_params() {
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if [ ! -f "$BACKUP_FILE" ]; then
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echo "✗ 未找到备份文件: $BACKUP_FILE"
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echo " 无法对比参数"
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exit 1
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fi
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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printf "%-35s %-25s %-25s\n" "参数" "优化前" "优化后"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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for p in "${PARAMS[@]}"; do
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old=$(grep "^$p" "$BACKUP_FILE" | awk -F= '{print $2}' | xargs)
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new=$(sysctl -n $p 2>/dev/null || echo "N/A")
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printf "%-35s %-25s %-25s\n" "$p" "$old" "$new"
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done
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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}
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if [ -z "$1" ]; then
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo " TCP 调优脚本 v25.10.11"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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echo "请选择操作："
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echo " 1 - 启用 BBR 调优"
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echo " 0 - 还原默认配置"
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echo " 2 - 对比优化前后参数"
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echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
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read -p "请输入选项 (1/0/2): " choice
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case "$choice" in
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1) apply_tune ;;
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0) restore_tune ;;
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2) compare_params ;;
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*) echo "✗ 无效选项" ; exit 1 ;;
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esac
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else
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case "$1" in
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1) apply_tune ;;
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0) restore_tune ;;
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2) compare_params ;;
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*) echo "用法: $0 {1|0|2}
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1 = 启用调优
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0 = 还原配置
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2 = 对比优化前后的参数" ; exit 1 ;;
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esac
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fi
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