高并发、大流量网卡调优

周五晚上LVS集群的一台LB由于CPU单核耗尽挂掉了，最后查到原因是网卡调优没有生效，今天查了一下网卡调优的资料，感谢同事higkoo给我讲解了一下这方面的东西，下面是关于我们公司网卡调优的相关知识，欢迎大家共同探讨，让我们的机器跑的更high。

1、Broadcom的网卡建议关闭GRO功能

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ethtool -K eth0 gro off ethtool -K eth1 gro off ethtool -K eth2 gro off ethtool -K eth3 gro off

2、关闭irqbalance服务并手动分配网卡中断

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service irqbalance stop chkconfig irqbalance off # 查看网卡中断号 grep ethx /proc/interrupts # 分配到每颗颗CPU核上 cat /proc/irq/{84,85,86,87,88,89,90,91,92,93}/smp_affinity echo 1 > /proc/irq/84/smp_affinity echo 2 > /proc/irq/85/smp_affinity echo 4 > /proc/irq/86/smp_affinity echo 8 > /proc/irq/87/smp_affinity echo 10 > /proc/irq/88/smp_affinity echo 20 > /proc/irq/89/smp_affinity echo 40 > /proc/irq/90/smp_affinity echo 80 > /proc/irq/91/smp_affinity echo 100 > /proc/irq/92/smp_affinity echo 200 > /proc/irq/93/smp_affinity PS:smp_affinity的值可以用下面脚本算哈，此脚本来自：http://rfyiamcool.blog.51cto.com/1030776/1335700 #!/bin/bash # echo "统计cpu的16进制" [ $# -ne 1 ] && echo ‘$1 is Cpu core number’ && exit 1 CCN=$1 echo “Print eth0 affinity” for((i=0; i<${CCN}; i++)) do echo ============================== echo "Cpu Core $i is affinity" ((affinity=(1<<i))) echo "obase=16;${affinity}" | bc done 使用方法：sh 脚本名字 空格 cpu核数

3、开启网卡的RPS功能 （Linux内核2.6.38或以上版本支持）

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# Enable RPS (Receive Packet Steering) rfc=4096 cc=$(grep -c processor /proc/cpuinfo) rsfe=$(echo $cc*$rfc | bc) sysctl -w net.core.rps_sock_flow_entries=$rsfe for fileRps in $(ls /sys/class/net/eth*/queues/rx-*/rps_cpus) do echo fff > $fileRps done for fileRfc in $(ls /sys/class/net/eth*/queues/rx-*/rps_flow_cnt) do echo $rfc > $fileRfc done tail /sys/class/net/eth*/queues/rx-*/{rps_cpus,rps_flow_cnt}

献上一个完整的脚本：

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vi /opt/sbin/change_irq.sh #!/bin/bash ethtool -K eth0 gro off ethtool -K eth1 gro off ethtool -K eth2 gro off ethtool -K eth3 gro off service irqbalance stop chkconfig irqbalance off cat /proc/irq/{84,85,86,87,88,89,90,91,92,93}/smp_affinity echo 1 > /proc/irq/84/smp_affinity echo 2 > /proc/irq/85/smp_affinity echo 4 > /proc/irq/86/smp_affinity echo 8 > /proc/irq/87/smp_affinity echo 10 > /proc/irq/88/smp_affinity echo 20 > /proc/irq/89/smp_affinity echo 40 > /proc/irq/90/smp_affinity echo 80 > /proc/irq/91/smp_affinity echo 100 > /proc/irq/92/smp_affinity echo 200 > /proc/irq/93/smp_affinity # Enable RPS (Receive Packet Steering) rfc=4096 cc=$(grep -c processor /proc/cpuinfo) rsfe=$(echo $cc*$rfc | bc) sysctl -w net.core.rps_sock_flow_entries=$rsfe for fileRps in $(ls /sys/class/net/eth*/queues/rx-*/rps_cpus) do echo fff > $fileRps done for fileRfc in $(ls /sys/class/net/eth*/queues/rx-*/rps_flow_cnt) do echo $rfc > $fileRfc done tail /sys/class/net/eth*/queues/rx-*/{rps_cpus,rps_flow_cnt} chmod +x /opt/sbin/change_irq.sh echo "/opt/sbin/change_irq.sh" >> /etc/rc.local PS：记得修改网卡中断号，别直接拿来用哦