linux-kernel - Re: IO queuing and complete affinity with threads (was Re: [PATCH 0/8] IO queuing and complete affinity)

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Message-ID: <20080208082422.GB15220@kernel.dk>
Date:	Fri, 8 Feb 2008 09:24:22 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	linux-kernel@...r.kernel.org, Alan.Brunelle@...com,
	arjan@...ux.intel.com, dgc@....com
Subject: Re: IO queuing and complete affinity with threads (was Re: [PATCH 0/8] IO queuing and complete affinity)

On Fri, Feb 08 2008, Nick Piggin wrote:
> On Fri, Feb 08, 2008 at 08:59:55AM +0100, Jens Axboe wrote:
> > On Fri, Feb 08 2008, Nick Piggin wrote:
> > > And if you don't?
> > 
> > Well if you don't ask for anything, you wont get anything :-)
> > As I mentioned, the patch is a playing ground for trying various setups.
> > Everything defaults to 'do as usual', set options to setup certain test
> > scenarios.
> 
> I mean if you don't know the completing CPU.

I still don't know quite what part of that patch you are referring to
here. If you don't have queue_affinity set, queueing a new request with
the hardware is generally done on the same CPU that just completed a
request. That is true even without any patches.

-- 
Jens Axboe

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