irq_balance_habrahabr.sh

irq_balance_habrahabr.sh

#!/bin/bash

# from http://habrahabr.ru/post/108240/
ncpus=`grep -ciw ^processor /proc/cpuinfo`
test "$ncpus" -gt 1 || exit 1

n=0
for irq in `cat /proc/interrupts | grep eth | awk '{print $1}' | sed s/\://g`
do
    f="/proc/irq/$irq/smp_affinity"
    test -r "$f" || continue
    cpu=$[$ncpus - ($n % $ncpus) - 1]
    if [ $cpu -ge 0 ]
            then
                mask=`printf %x $[2 ** $cpu]`
                echo "Assign SMP affinity: eth queue $n, irq $irq, cpu $cpu, mask 0x$mask"
                echo "$mask" > "$f"
                let n+=1
    fi
done

http://www.smallo.ruhr.de/award.html is yours

cat /proc/interrupts | grep eth | awk '{print $1}' | sed s/\://g
-->
awk -F"[ :]" '/eth/{print $1}' /proc/interrupts

You can replace line 4 with this:
ncpus=$(nproc)

Thanks for feedback! But it's very draft tool and you could fix it as you want :)

Intel provides set_irq_affinity.sh with their drivers, that can do that + XPS and NUMA:
https://gist.github.com/SaveTheRbtz/8875474