图4.3 合理的中断绑定
set_irq_affinity脚本位于http://mirror.oa.com/tlinux/tools/set_irq_affinity.sh。
6.多队列网卡识别
#lspci -vvv
Ethernet controller的条目内容，如果有MSI-X && Enable+ && TabSize > 1，则该网卡是多队列网卡，如图4.4所示。
图4.4 lspci内容
Message Signaled Interrupts(MSI)是PCI规范的一个实现，可以突破CPU 256条interrupt的限制，使每个设备具有多个中断线变成可能，多队列网卡驱动给每个queue申请了MSI。MSI-X是MSI数组，Enable+指使能，TabSize是数组大小。
# setting up irq affinity according to /proc/interrupts
# 2008-11-25 Robert Olsson
# 2009-02-19 updated by Jesse Brandeburg
#
# > Dave Miller:
# (To get consistent naming in /proc/interrups)
# I would suggest that people use something like:
# char buf[IFNAMSIZ+6];
#
# sprintf(buf, "%s-%s-%d",
# netdev->name,
# (RX_INTERRUPT ? "rx" : "tx"),
# queue->index);
#
# Assuming a device with two RX and TX queues.
# This script will assign:
#
# eth0-rx-0 CPU0
# eth0-rx-1 CPU1
# eth0-tx-0 CPU0
# eth0-tx-1 CPU1
#
set_affinity()
{
MASK=$((1<<$VEC))
printf "%s mask=%X for /proc/irq/%d/smp_affinity " $DEV $MASK $IRQ
printf "%X" $MASK > /proc/irq/$IRQ/smp_affinity
#echo $DEV mask=$MASK for /proc/irq/$IRQ/smp_affinity
#echo $MASK > /proc/irq/$IRQ/smp_affinity
}
if [ "$1" = "" ] ; then
echo "Description:"
echo " This script attempts to bind each queue of a multi-queue NIC"
echo " to the same numbered core, ie tx0|rx0 --> cpu0, tx1|rx1 --> cpu1"
echo "usage:"
echo " $0 eth0 [eth1 eth2 eth3]"
fi
# check for irqbalance running
IRQBALANCE_ON=`ps ax | grep -v grep | grep -q irqbalance; echo $?`
if [ "$IRQBALANCE_ON" == "0" ] ; then
echo " WARNING: irqbalance is running and will"
echo " likely override this script"s affinitization."
echo " Please stop the irqbalance service and/or execute"
echo " "killall irqbalance""
fi
#
# Set up the desired devices.
#
for DEV in $*
do
for DIR in rx tx TxRx
do
MAX=`grep $DEV-$DIR /proc/interrupts | wc -l`
if [ "$MAX" == "0" ] ; then
MAX=`egrep -i "$DEV:.*$DIR" /proc/interrupts | wc -l`
fi
if [ "$MAX" == "0" ] ; then
echo no $DIR vectors found on $DEV
continue
#exit 1
fi
for VEC in `seq 0 1 $MAX`
do
IRQ=`cat /proc/interrupts | grep -i $DEV-$DIR-$VEC"$" | cut -d: -f1 | sed "s/ //g"`
if [ -n "$IRQ" ]; then
set_affinity
else
IRQ=`cat /proc/interrupts | egrep -i $DEV:v$VEC-$DIR"$" | cut -d: -f1 | sed "s/ //g"`
if [ -n "$IRQ" ]; then
set_affinity
fi
fi
done
done
done
- 看不过瘾？点击下面链接！
- 虚拟机下CentOS 6.5配置IP地址的三种方法
- 如何让红旗Linux支持fFTP服务并允许root用户登录
- CentOS 7系统怎么安装极点五笔输入法
- Ubuntu安装Transmission 2.90的方法
- linux管道及重定向详解
- 如何在Linux(CentOS)下重置MySQL根(Root)密码
