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Date: Thu, 14 Dec 2006 21:23:44 +0100 From: Jens Axboe <jens.axboe@...cle.com> To: "Chen, Kenneth W" <kenneth.w.chen@...el.com> Cc: 'linux-kernel' <linux-kernel@...r.kernel.org> Subject: Re: [patch] speed up single bio_vec allocation On Fri, Dec 08 2006, Chen, Kenneth W wrote: > > Chen, Kenneth wrote on Wednesday, December 06, 2006 10:20 AM > > > Jens Axboe wrote on Wednesday, December 06, 2006 2:09 AM > > > This is what I had in mind, in case it wasn't completely clear. Not > > > tested, other than it compiles. Basically it eliminates the small > > > bio_vec pool, and grows the bio by 16-bytes on 64-bit archs, or by > > > 12-bytes on 32-bit archs instead and uses the room at the end for the > > > bio_vec structure. > > > > Yeah, I had a very similar patch queued internally for the large benchmark > > measurement. I will post the result as soon as I get it. > > > Jens, this improves 0.25% on our db transaction processing benchmark setup. > The patch tested is (on top of 2.6.19): > http://marc.theaimsgroup.com/?l=linux-kernel&m=116539972229021&w=2 Ok, well it's not much but if it's significant it's not too bad either :-) Some tests I ran locally showed it being _slower_, which is a little odd. They were basically hammering requests through the block layer with a null end. -- Jens Axboe - 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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