linux-kernel - Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense buffer

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Message-ID: <84144f020905250115m1dffb51er51f8f339ab58a704@mail.gmail.com>
Date:	Mon, 25 May 2009 11:15:42 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
	akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense 
	buffer

On Mon, May 25, 2009 at 10:30 AM, Jens Axboe <jens.axboe@...cle.com> wrote:
> Fold the sense buffer into the command, thereby eliminating a slab
> allocation and free per command.
>
> Signed-off-by: Jens Axboe <jens.axboe@...cle.com>

Interesting. I wonder how this affects the SLAB vs. SLUB regression
people are seeing on high end machines in OLTP benchmarks.

                                      Pekka
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