linux-kernel - Re: READ SCSI cmd seems to fail on SATA optical devices...

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Date:	Wed, 15 Nov 2006 16:28:09 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Phillip Susi <psusi@....rr.com>
Cc:	Tejun Heo <htejun@...il.com>, Mathieu Fluhr <mfluhr@...o.com>,
	Arjan van de Ven <arjan@...radead.org>, jgarzik@...ox.com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: READ SCSI cmd seems to fail on SATA optical devices...

On Wed, 15 Nov 2006 11:17:29 -0500
Phillip Susi <psusi@....rr.com> wrote:

> The original patch memsets the entire buffer only to copy over most of 
> it right after.  Could you amend the patch so that it memcpys first, 
> then memsets only the remainder of the buffer?  No sense wasting cpu 
> cycles.

Look at the generated code - its faster to memset the entire CDB as Tejun
is doing than actually bother to think about it.

Alan
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