linux-kernel - Re: IRQ balancing on a router

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Date:	Fri, 03 Oct 2008 08:05:27 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Jason Baron <jbaron@...hat.com>
CC:	Jan Kasprzak <kas@...muni.cz>, linux-kernel@...r.kernel.org
Subject: Re: IRQ balancing on a router

Jason Baron wrote:
>> one of the hard cases for irqbalance is that irqbalance doesn't have a
>> way to find out the actual cpu time spend in the handlers. For
>> networking it makes an estimate just based on the number of packets
>> (which is better than nothing)... but that breaks down if you have an
>> non-symmetry in CPU costs per packet like you have.
>>
>> The good news is that irqthreads at least have the potential to solve
>> this "lack of information"; if not, we could consider doing a form of
>> microaccounting for irq handlers....
>>
>>
> 
> perhaps, this could be addressed using tracepoints. The currently
> proposed ones are at the beginning and end of 'handle_IRQ_event()'. See:
> http://marc.info/?l=linux-kernel&m=121616099830280&w=2
> 
something that you always need should not be a tracepoint.

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