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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
@psycho23
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psycho23 commented May 6, 2017

$ cat /proc/irq/*/smp_affinityff
0f
0f
0f
0f
0f
0f
0c

$ echo $[2 ** 0] $[2 ** 1] $[2 ** 2] $[2 ** 3]
1 2 4 8

@psycho23
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psycho23 commented May 6, 2017

$ printf '%02x %02x %02x %02x' "$[2 ** 0]" "$[2 ** 1]" "$[2 ** 2]" "$[2 ** 3]"
01 02 04 08

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