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Date: Wed, 6 Nov 2002 19:05:03 -0500
From: Adam Kropelin <akropel1@rochester.rr.com>
To: Patrick Mansfield <patmans@us.ibm.com>
Cc: Jens Axboe <axboe@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: 2.5.46: ide-cd cdrecord (almost) success report
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On Wed, Nov 06, 2002 at 03:52:35PM -0800, Patrick Mansfield wrote:
> On Wed, Nov 06, 2002 at 06:33:25PM -0500, Adam Kropelin wrote:
> > On Wed, Nov 06, 2002 at 10:11:44AM -0800, Patrick Mansfield wrote:
> 
> > > What queue depth is the AIC setting?
> > > 
> > > SCSI in 2.5.x no longer copies the request, so if you have a queue
> > > depth larger than the allocated requests there might not be
> > > any free requests left for the blk layer to play with.
> > > 
> > > AIC default queue depth is 253 (with 2.5.46 queue depth can be set to 1
> > 
> > Are you talking tcq depth here? Best as I can tell, 2.5.46 defaults to
> > 16. Lowering it to 2 doesn't seem to help.
> 
> CONFIG_SCSI_AIC7XXX=y
> CONFIG_AIC7XXX_CMDS_PER_DEVICE=253
> CONFIG_AIC7XXX_RESET_DELAY_MS=15000

Ok, that is indeed the setting I was changing. I've been carrying this
same .config with my for $BIGNUM kernel versions so I must have lowered
it to 16 sometime in the past.

Even setting queue depth to 1 didn't affect the cdrecord problem.

--Adam
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