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Subject: Re: AIC7xxx panic
From: Jim Crilly <noth@noth.is.eleet.ca>
To: Rob Turk <r.turk@chello.nl>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <9ppc3l$cde$1@ncc1701.cistron.net>
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	<9ppc3l$cde$1@ncc1701.cistron.net>
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Date: 07 Oct 2001 07:28:57 -0400
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Both disks on the controller are Seagate Cheetahs, the one being worked
during the panic is a ST39204LW, the other disk is a ST318451LW.

I did have TCQ enabled and I left it at the default of 255, I'll try a
lower value tomorrow, since it's so late.

Jim

On Sun, 2001-10-07 at 06:48, Rob Turk wrote:
> "Jim Crilly" <noth@noth.is.eleet.ca> wrote in message
> news:cistron.1002451051.3718.20.camel@warblade...
> > I got a reproducible panic while running dbench simulating 25+ clients,
> > the new aic7xxx driver panics with "Too few segs for dma mapping.
> > "Increase AHC_NSEG". The partition in question is FAT32 and on a
> > different disk than /, I'm not using HIGHMEM. I am using XFS and the
> > preempt patches, but I don't think they're related to the panic.
> >
> > The odd thing, is if I run dbench in the same manner on my / partition,
> > which is on a different disk on the same controller, it goes fine. It
> > seems, to my untrained eye anyway, to be a bad interaction between the
> > vfat driver and the aic7xxx driver.
> >
> > I'm using the old aic7xxx driver right now and it's fine, has anyone
> > else seen anything like this?
> >
> > Jim
> 
> Since this seems to fail on just one disk, it might have to do with one of the
> disk characteristics, like command queue depth. Did you enable Tagged Command
> Queueing, and if so, can you try playing around with the maximum depth?
> 
> Rob
> 
> 
> 
> 
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