linux-kernel - RE: [patch] speed up single bio

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Message-ID: <000001c71b16$4ca91b90$d134030a@amr.corp.intel.com>
Date:	Fri, 8 Dec 2006 14:14:58 -0800
From:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
To:	"'Jens Axboe'" <jens.axboe@...cle.com>
Cc:	"'linux-kernel'" <linux-kernel@...r.kernel.org>
Subject: RE: [patch] speed up single bio_vec allocation

> 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

- Ken
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