linux-kernel - Re: [RFC] export irq_set/get_affinity() for multiqueue network drivers

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Message-ID: <48B7A079.5070409@inria.fr>
Date:	Fri, 29 Aug 2008 09:08:41 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	David Miller <davem@...emloft.net>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC] export irq_set/get_affinity() for multiqueue network drivers

David Miller wrote:
> I think we should rather have some kind of generic thing in the
> IRQ layer that allows specifying the usage model of the device's
> interrupts, so that the IRQ layer can choose a default affinities.
> 
> I never notice any of this complete insanity on sparc64 because
> we flat spread out all of the interrupts across the machine.
> 
> What we don't want it drivers choosing IRQ affinity settings,
> they have no idea about NUMA topology, what NUMA node the
> PCI controller sits behind, what cpus are there, etc.  and
> without that kind of knowledge you cannot possible make
> affinity decisions properly.

As long as we get something better than the current behavior, I am fine
with it :)

Brice
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