linux-kernel - Re: [BUG] firewire: mass-storage i/o-problems

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Date:	Mon, 23 Jul 2007 20:44:05 +0200
From:	Manuel Lauss <mano@...rinelk.homelinux.net>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Andreas Messer <andreas.messer@...d-mail.uni-wuerzburg.de>,
	linux-kernel@...r.kernel.org, linux1394-devel@...ts.sourceforge.net
Subject: Re: [BUG] firewire: mass-storage i/o-problems

On Mon, Jul 23, 2007 at 08:33:36PM +0200, Manuel Lauss wrote:
> On Mon, Jul 23, 2007 at 01:34:28PM +0200, Stefan Richter wrote:
> > Manuel Lauss wrote:
> > > I noticed the failures start when there are 2 concurrent disk accesses
> > > (copy something from fw disk on shell 1 and it runs fine; start to
> > > copy something TO the fw disk on shell 2 and a "management write failed"
> > > error appears after 1-2 sec. with the orb timeout after a looong time)
> > 
> > Most of my tests have been with a single process, but I already tested
> > several processes at once in parallel too.  But probably only on the
> > bigger machine where neither the CPU nor the PCI bus (and this might be
> > important) would become a bottleneck.  I have to test this again on the
> > smaller machines.
> 
> I think I found a way to reliably reproduce the problem (2.6.22)
> 
> NFS-export the fw disk, mount it on another host, put a movie on it,
> play it with mplayer on the other machine. Seek a little in the movie,
> locks up every time here. If it doesnt, copy data to the disk in parallel.

Actually, copying data to the disk while playing/seeking through a moviefile
which is also located on it is already enough. Forget the NFS thing...

Afterwards the firewire_sbp2 module has to be rmmod-ed and modprobed again
or it will continue to throw errors even for single reads.

I hope this helps tracking it down...

Thanks,
	Manuel Lauss
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