irq.sh

#!/bin/bash
#
# Author: Tomas Herceg <[email protected]>
# Fixed irqbalancing maping for eth and sas, because sometimes irqbalance sucks
[ "$1" == "debug" ] && debug=true || debug=false

$debug && set -x

systemctl disable irqbalance &>/dev/null
systemctl stop irqbalance &>/dev/null
irqbalance --oneshot --foreground

$debug && set +x

tot=`cat /proc/interrupts |grep 'eth[0-9]\{1,\}-' |wc -l`
cpus=`grep -c ^processor /proc/cpuinfo`

num=$(( tot / cpus ))
[ $num -le 0 ] && num=1

i=0
j=0

$debug && echo total network interupts: $tot
$debug && echo total cpus: $cpus
$debug && echo interpupt per core: $num

for int in `cat /proc/interrupts |grep 'eth[0-9]\{1,\}-' |cut -f1 -d':'`; do
        b=`echo "obase=16; 2 ^ $j" | bc`
        echo $b > /proc/irq/$int/smp_affinity
        $debug && echo CPU:$j irq:$int
        i=$((i + 1))
        if [ $i -eq $num ]; then
                i=0
                j=$((j + 1))
        fi
done

for int in `cat /proc/interrupts |grep 'sas' |cut -f1 -d':'`; do
        b=`echo "obase=16; 2 ^ $j" | bc`
        echo $b > /proc/irq/$int/smp_affinity
        $debug && echo CPU:$j irq:$int
        i=$((i + 1))
        if [ $i -eq $num ]; then
                i=0
                j=$((j + 1))
        fi
done