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From: Jim Crilly <>
To: Rob Turk <>
Subject: Re: AIC7xxx panic
Date: 07 Oct 2001 07:28:57 -0400	[thread overview]
Message-ID: <1002454137.284.6.camel@warblade> (raw)
In-Reply-To: <9ppc3l$cde$>
In-Reply-To: <1002451051.3718.20.camel@warblade>  <9ppc3l$cde$>

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.


On Sun, 2001-10-07 at 06:48, Rob Turk wrote:
> "Jim Crilly" <> 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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  parent reply	other threads:[~2001-10-07 11:30 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-10-07 10:37 Jim Crilly
2001-10-07 10:48 ` Rob Turk
2001-10-07 11:28 ` Jim Crilly [this message]
2001-10-07 12:21   ` David M. Grimes
2001-10-07 14:48     ` Gérard Roudier
2001-10-08  2:31       ` Jim Crilly
2001-10-09  0:51         ` David M. Grimes
2001-10-09 11:47           ` Alan Cox
2001-10-09  2:21       ` Justin T. Gibbs

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