linux-kernel - Re: [patch 6/7] ps3: ROM Storage Driver

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Message-ID: <20070530101348.GD24586@lst.de>
Date:	Wed, 30 May 2007 12:13:49 +0200
From:	Christoph Hellwig <hch@....de>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Christoph Hellwig <hch@....de>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: [patch 6/7] ps3: ROM Storage Driver

On Tue, May 29, 2007 at 01:11:41PM +0200, Geert Uytterhoeven wrote:
> > This looks very inefficient.  Just set sg_tablesize of your driver
> > to 1 to avoid getting mutiple segments.
> 
> The disadvantage of setting sg_tablesize = 1 is that the driver will get small
> requests (PAGE_SIZE) most of the time, which is very bad for performance.

If you set .clustering = 1 in your host template you will frequently
get larger requests.

For any sane hypervisor or hardware the copy should be worth
than that.  Then again a sane hardware or hypervisor would support
SG requests..

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