Sorry for little information and mistakes in letter. Jesse Brandeburg
ask for all my questions. In future i will try to be more accurate then
write letters and post more info.
Please not think that it disrespect for you. Its simple language barrier =(
On 18-02-2008 10:18, Badalian Vyacheslav wrote:
Hello all.
Hi,
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 think you should show here /proc/interrupts in all these cases.
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 =)
If some patch works for you, and you can show here its advantages,
you should probably add here some link and request for merging.
BTW, I wonder if you tried to check if changing CONFIG_HZ makes any
difference here?
Regards,
Jarek P.
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