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Linux一键性能调优神器tuned-adm|实测数据对比

  • 2026-07-01 15:28:31
Linux一键性能调优神器tuned-adm|实测数据对比

1. 什么是 tuned-adm

tuned-adm 是 Red Hat 开发的 Linux 系统性能调优守护进程。它提供了一系列预设的调优 Profile,每个 Profile 自动调整一组内核参数(CPU 调度器、内存管理、磁盘预读、网络缓冲区等),针对不同的工作负载场景进行优化。

核心价值:不需要手动修改 /etc/sysctl.conf 中的数十个参数,一条命令即可切换到适合当前工作负载的内核配置。Profile 之间的切换是动态的,不影响运行中的服务。

2. 常用 Profile

3. 基本用法

# 查看当前 Profiletuned-adm active          # → latency-performance# 列出所有可用 Profiletuned-adm list# 切换 Profiletuned-adm profile throughput-performance# 查看推荐 Profile(系统自检后推荐)tuned-adm recommend      # → virtual-guest (如果在 VM 内)# 关闭所有调优(恢复出厂内核参数)tuned-adm off# 检查 tuned 服务状态systemctl status tuned

4. 各 Profile 修改了哪些参数?

5. 实测:4 种 Profile 性能对比

测试平台:ceph01, 2× Xeon Gold 6140 (72线程), 251GB RAM, 8TB HDD (sdb)

6. 坑:network-throughput 不设 rmem_max

7. 如何选择 Profile

8. 自定义 Profile

# 1. 创建自定义 profile 目录mkdir /etc/tuned/my-throughput-netcat > /etc/tuned/my-throughput-net/tuned.conf << 'EOF'[main]summary=Custom: throughput-performance + fixed network buffersinclude=throughput-performance[sysctl]net.core.rmem_max=16777216net.core.wmem_max=16777216net.ipv4.tcp_rmem="4096 87380 16777216"net.ipv4.tcp_wmem="4096 65536 16777216"net.core.netdev_max_backlog=5000EOF# 2. 激活tuned-adm profile my-throughput-net# 3. 验证sysctl net.core.rmem_max       # 应为 16777216sysctl net.ipv4.tcp_rmem       # 末位应为 16777216

9. 总结

    1. tuned-adm 是快速切换内核调优配置的好工具。
      一条命令即可改变 CPU 调速器、调度器参数、脏页比例、磁盘预读、网络缓冲区等十余个参数。
    2. 对不同工作负载的影响不同:
      CPU 密集型任务(单线程差异 2-5%)、多核满载能力(load 从 42 到 53)、磁盘顺序读(readahead 从 128KB 到 4MB)。但对磁盘随机 IO 几乎无影响——机械瓶颈不是软件能解决的。
    3. network-throughput 有 rmem_max 陷阱:
      它设置了 16MB TCP buffer,但 net.core.rmem_max 仍为 208KB,导致大 buffer 被硬限制。这是一个常见的配置遗漏。
    4. balanced 比想象中好:
      即使使用 powersave 调速器,单线程性能仅比 latency-performance 差 2.3%。对于大多数服务器,balanced 是安全的出发点。
    5. 没有"万能最优" Profile。
      latency 用低延迟配置、throughput 用大缓冲配置、网络密集型需要手动补上 rmem_max。理解每个 Profile 改了什么,比盲目切换更重要。
    超线程真的能释放CPU算力吗?72 线程 vs 36 实测分析
    实战:用一块960G SSD做缓存,让4×8TB RAID10 iops飙升20倍
    TSO/GRO:硬件卸载如何让网速飙升17%、CPU损耗降低92%

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    1. CONNECT:[ UseTime:0.000799s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001211s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004323s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004670s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001158s ]
    6. SELECT * FROM `set` [ RunTime:0.000944s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001154s ]
    8. SELECT * FROM `article` WHERE `id` = 496802 LIMIT 1 [ RunTime:0.009928s ]
    9. UPDATE `article` SET `lasttime` = 1783027348 WHERE `id` = 496802 [ RunTime:0.014340s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.006880s ]
    11. SELECT * FROM `article` WHERE `id` < 496802 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001152s ]
    12. SELECT * FROM `article` WHERE `id` > 496802 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.017528s ]
    13. SELECT * FROM `article` WHERE `id` < 496802 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.015277s ]
    14. SELECT * FROM `article` WHERE `id` < 496802 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001415s ]
    15. SELECT * FROM `article` WHERE `id` < 496802 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001352s ]
    0.159048s