Re: [PATCH] Re: Bad network performance over 2Gbps

[Stephen Hemminger]

Bodo Eggert wrote:
> Kok, Auke <auke-jan.h.kok@xxxxxxxxx> wrote:
>
>   
> > [X86] IRQBALANCE: Mark as BROKEN and disable by default
> >
> > The IRQBALANCE option causes interrupts to bounce all around on SMP systems
> > quickly burying the CPU in migration cost and cache misses. Mainly affected
> > are network interrupts and this results in one CPU pegged in softirqd
> > completely.
> >     
>
> If this is the problem, maybe it would help to only balance the IRQs each
> e.g. ten seconds? Unfortunately I have no SMP system to try it out.
>
>
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>   
The kernel level IRQBALANCE is useless. The userlevel irqbalance does 
the right thing,
it handles multi-core, and network devices, and all the other special cases.
*Don't use kernel level irqbalance*
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