linux-kernel - Re: [PATCH] libata-sff: fix 32-bit PIO regression

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Message-ID: <49905D08.4050302@ru.mvista.com>
Date:	Mon, 09 Feb 2009 19:42:48 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, alan@...rguk.ukuu.org.uk, rjw@...k.pl
Subject: Re: [PATCH] libata-sff: fix 32-bit PIO regression

Hugh Dickins wrote:

>>>Yes, looks nice, and works for me.  My only criticism would be,
>>>minor issue unchanged by your patch, that actually "slop" isn't
>>>unlikely enough to deserve an "unlikely" - slop of 1 or 3 is
>>>unlikely, but slop of 2 is quite common.

>> Common on what types of ATAPI commands? I can hardly believe that they are
>>common on the block I/O...

> When I checked (mounting and listing a CD), about 34% of
> commands had slop 2.

    Hm, that probably involved the raw block reads. I don't remember the raw 
sector length off-hand but it may well be just even, not divisble by 4.

> But you're right, now I try copying
> a large file, there's no slop involved in that at all.

> Hugh

MBR, Sergei
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