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Message-ID: <20080208073859.GE9730@wotan.suse.de> Date: Fri, 8 Feb 2008 08:38:59 +0100 From: Nick Piggin <npiggin@...e.de> To: Jens Axboe <jens.axboe@...cle.com> 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 Thu, Feb 07, 2008 at 07:25:45PM +0100, Jens Axboe wrote: > Hi, > > Here's a variant using kernel threads only, the nasty arch bits are then > not needed. Works for me, no performance testing (that's a hint for Alan > to try and queue up some testing for this variant as well :-) Well this stuff looks pretty nice (although I'm not sure whether the softirq->thread changes are a good idea for performance, I guess we'll see). You still don't have the option that the Intel patch gave, that is, to submit on the completer. I guess that you could do it somewhat generically by having a cpuid in the request queue, and update that with the completing cpu. At least they reported it to be the most efficient scheme in their testing, and Dave thought that migrating completions out to submitters might be a bottleneck in some cases. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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