Subject: Re: r8169 (+others ?) and note_interrupt performance hit on 2.6.30.x

From: Michal Soltys <[email-masked]>
Date: Sun, 26 Jul 2009 12:50:28 +0200

Francois Romieu wrote:
> Michal Soltys <[email-masked]> :
> [...]
>> I did some quick oprofile, and noticed one new call -
>> note_interrupt - which wasn't present in the earlier kernel,
>> taking majority of the cpu time, relatively to the rest, e.g.:
>>
>> samples  cum. samples  %        cum. %     symbol name
>> 90984    90984         42.8695  42.8695    note_interrupt
> 
> May be some screaming irq.
> 
> Do your /proc/interrupts look the same with both kernels ?
> 

Yes - nothing unusual there, and amount of interrupts on the interface 
corresponds to pps. The rest is roughly idle.