CPU亲和性

http://blog.youkuaiyun.com/turkeyzhou/article/details/7528182
http://www.tuicool.com/articles/jiY7Zn

脚本如下：

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\n” $DEV$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