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

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Message-ID: <20070723183336.GA3736@roarinelk.homelinux.net>
Date:	Mon, 23 Jul 2007 20:33:36 +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 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.

Thanks,
	Manuel Lauss

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