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
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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}"
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bc
done
使用方法：sh 脚本名字 空格 cpu核数
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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 > $fileRfc
done
tail
/sys/class/net/eth
*
/queues/rx-
*/{rps_cpus,rps_flow_cnt}
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献上一个完整的脚本：
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vi
/opt/sbin/change_irq
.sh
#!/bin/bash
ethtool
-K eth0 gro off
ethtool
-K eth1 gro off
ethtool
-K eth2 gro off
ethtool
-K eth3 gro off
service irqbalance stop
chkconfig irqbalance off
cat
/proc/irq/
{84,85,86,87,88,89,90,91,92,93}
/smp_affinity
echo
1 >
/proc/irq/84/smp_affinity
echo
2 >
/proc/irq/85/smp_affinity
echo
4 >
/proc/irq/86/smp_affinity
echo
8 >
/proc/irq/87/smp_affinity
echo
10 >
/proc/irq/88/smp_affinity
echo
20 >
/proc/irq/89/smp_affinity
echo
40 >
/proc/irq/90/smp_affinity
echo
80 >
/proc/irq/91/smp_affinity
echo
100 >
/proc/irq/92/smp_affinity
echo
200 >
/proc/irq/93/smp_affinity
# Enable RPS (Receive Packet Steering)
rfc=4096
cc=$(
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
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