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

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Message-Id: <1180438319.19517.150.camel@localhost.localdomain>
Date:	Tue, 29 May 2007 21:31:59 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
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, 2007-05-29 at 13:11 +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.

And the joke is that not only the HW can do scatter & gather but you
also have an iommu ...

Ben.


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