From: Arjan van de Ven <arjan@linux.intel.com>
To: Jason Baron <jbaron@redhat.com>
Cc: Jan Kasprzak <kas@fi.muni.cz>, linux-kernel@vger.kernel.org
Subject: Re: IRQ balancing on a router
Date: Fri, 03 Oct 2008 08:05:27 -0700 [thread overview]
Message-ID: <48E634B7.60002@linux.intel.com> (raw)
In-Reply-To: <20081003142941.GC3167@redhat.com>
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.
next prev parent reply other threads:[~2008-10-03 15:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-03 13:21 IRQ balancing on a router Jan Kasprzak
2008-10-03 13:38 ` Arjan van de Ven
2008-10-03 14:29 ` Jason Baron
2008-10-03 15:05 ` Arjan van de Ven [this message]
2008-10-03 14:57 ` Jan Kasprzak
2008-10-03 15:22 ` Arjan van de Ven
2008-10-07 10:29 ` Peter Zijlstra
2008-10-07 15:00 ` Nick Piggin
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