[8538] in linux-scsi channel archive

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Re: Bad segment list supplied to aha1542.c

daemon@ATHENA.MIT.EDU (Jens Axboe)
Tue Apr 4 13:14:20 2000

Date:	Tue, 4 Apr 2000 19:01:53 +0200
From: Jens Axboe <axboe@suse.de>
To: Eric Youngdale <eric@andante.org>
Cc: Nigel Chan <nigel.chan@alcatel.com.au>,
	linux-scsi@vger.rutgers.edu
Message-ID: <20000404190153.S5338@suse.de>
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In-Reply-To: <002701bf9e56$3818aae0$4d0310ac@fairfax.datafocus.com>; from eric@andante.org on Tue, Apr 04, 2000 at 12:52:53PM -0400

On Tue, Apr 04 2000, Eric Youngdale wrote:
>     Yes, this isn't good at all.  We will need to look and see how that 17th
> segment got into the list.

It could get in there if the write / read is big enough, nothing is
limiting the number of request segments for such hardware right now
(aside from the ll_rw_blk default MAX_SEGMENTS).

>     The limit of 16 segments is a hardware limit on the 1542.  Nothing we
> can do about it.

Do some of the other SCSI adapters have similar scatter/gather limitations?
I'm thinking if this should be a generic work-around.

-- 
*  Jens Axboe <axboe@suse.de>
*  Linux CD/DVD-ROM, SuSE Labs
*  http://kernel.dk

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