[7922] in linux-scsi channel archive
Re: request merge changes?
daemon@ATHENA.MIT.EDU (Alan Cox)
Tue Jan 25 06:01:14 2000
To: axboe@suse.de (Jens Axboe)
Date: Tue, 25 Jan 2000 02:21:05 +0000 (GMT)
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <20000125014005.D3512@suse.de> from "Jens Axboe" at Jan 25, 2000 01:40:05 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
> I was relieing on the ll_rw_block layer to correctly handle
> request merging and this was fine in 2.3.26. I would receive
> a single clustered request. In 2.3.39 I actually get two requests,
> one with the first block and a second with the remaining merged.
>
> Surely this isn't the intended effect. Comments?
Plugging appears to be broken for the scsi layer. I suspect its bust in 2.2
as well but 2.3.39 is getting the I/O out faster.
I have lots of raid folks bitching because they cant get nice 64K I/O's
from Linux which is what they all want (that or 128K I/O's). I think its
all related somewhere, but Im not a scsi layer guru
Alan
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