Hello all.
Interesting think:
Have PC that do NAT. Bandwidth about 600 mbs.
Have 4 CPU (2xCoRe 2 DUO "HT OFF" 3.2 HZ).
irqbalance in kernel is off.
nat2 ~ # cat /proc/irq/217/smp_affinity
00000001
nat2 ~ # cat /proc/irq/218/smp_affinity
00000003
Load SI on CPU0 and CPU1 is about 90%
Good... try do
echo ffffffff > /proc/irq/217/smp_affinity
echo ffffffff > /proc/irq/218/smp_affinity
Get 100% SI at CPU0
Question Why?
I listen that if use IRQ from 1 netdevice to 1 CPU i can get 30%
perfomance... but i have 4 CPU... i must get more perfomance if i cat
"ffffffff" to smp_affinity.
picture looks liks this:
0-3 CPU get over 50% SI.... bandwith up.... 55% SI... bandwith up...
100% SI on CPU0....
I remember patch to fix problem like it... patched function
e1000_clean... kernel on pc have this patch (2.6.24-rc7-git2)... e1000
driver work much better (i up to 1.5-2x bandwidth before i get 100% SI),
but i think that it not get 100% that it can =)
Thanks for answers and sorry for my English
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