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

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Message-ID: <20090525104908.GV11363@kernel.dk>
Date:	Mon, 25 May 2009 12:49:08 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Boaz Harrosh <bharrosh@...asas.com>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, chris.mason@...cle.com,
	david@...morbit.com, akpm@...ux-foundation.org, jack@...e.cz,
	yanmin_zhang@...ux.intel.com, linux-scsi@...r.kernel.org,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	James Bottomley <James.Bottomley@...senpartnership.com>
Subject: Re: [PATCH 03/13] scsi: unify allocation of scsi command and sense
	buffer

On Mon, May 25 2009, Christoph Hellwig wrote:
> On Mon, May 25, 2009 at 01:33:42PM +0300, Boaz Harrosh wrote:
> > 1. If we have a machine with few type of hosts active each with it's own
> > cmnd_slab we end up with many more slabs then today. Even though at the
> > end they all happen to be of the same size. (With the pool reserves it
> > can get big also).
> 
> Note that this should be optional.  Device not having their own
> per-command structure would continue using the global pools.  Those
> that have their own per-command structures already have their own pools
> anyway.

The multiple pools of the same size "issue" can also easily be resolved
by having SCSI provide a way to setup/destroy these pools. Then it can
just reuse an existing pool, if it has the same size.

However, I doubt that this is really a real life issue that's worth
worrying about.

-- 
Jens Axboe

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