linux-kernel - Re: [PATCH 1/2] Avoid bio

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Message-ID: <Pine.LNX.4.64.0807031946580.21723@engineering.redhat.com>
Date:	Thu, 3 Jul 2008 19:51:59 -0400 (EDT)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	Neil Brown <neilb@...e.de>
Subject: Re: [PATCH 1/2] Avoid bio_endio recursion

On Fri, 4 Jul 2008, Alan Cox wrote:

>> SCSI. Even the NCQ commands are done via IDE registers, not SCSI command
>> block. It seems like someone wanted to save few weeks of coding by reusing
>
> Thats really a trivial question of encoding, in all but actual
> byte encoding it is SCSI. Once you look at SAS and ATAPI it's all the
> more clear.

For SAS and ATAPI you're right - that's SCSI.

But not for SATA disks. The only thing SCSI and SATA disk have common is 
that they may process concurrently more requests. There's nothing else.

Mikulas
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