From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Emmanuel Florac <eflorac@intellique.com>
Cc: Wakko Warner <wakko@animx.eu.org>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: Burning multiple DVDs at one time
Date: Sat, 17 Mar 2012 13:47:56 +0100 [thread overview]
Message-ID: <20120317134756.7a9ea99c@stein> (raw)
In-Reply-To: <20120317115324.10b39bb7@galadriel.home>
On Mar 17 Emmanuel Florac wrote:
> Le Sat, 17 Mar 2012 09:56:44 +0100 vous écriviez:
>
> > This is likely due to serialization by a global mutex in the sr
> > driver. Have a look at thread "[PATCH] [SCSI] sr: fix multi-drive
> > performance, remove BKL replacement" from February.
> > https://lkml.org/lkml/2012/2/28/230
>
> When was this regression introduced? I have a dedicated cd burning
> machine running 2.6.35.x, and it works great with 4 drives at a time.
BKL was replaced by sr_mutex in 2.6.37-rc1.
Wakko, you could try the patch from the mentioned thread and see whether
it fixes your problem. But be aware that the patch opens possible race
conditions between processes that access the same optical drive, e.g.
applications vs. udisks-daemon. (I haven't noticed anything bad during the
period of using the patch though.)
--
Stefan Richter
-=====-===-- --== =---=
http://arcgraph.de/sr/
next prev parent reply other threads:[~2012-03-17 12:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-15 22:53 Burning multiple DVDs at one time Wakko Warner
2012-03-17 8:56 ` Stefan Richter
2012-03-17 10:53 ` Emmanuel Florac
2012-03-17 12:47 ` Stefan Richter [this message]
2012-03-17 14:22 ` Wakko Warner
2012-03-17 15:28 ` Stefan Richter
2012-03-18 13:30 ` Wakko Warner
2012-03-18 14:01 ` Stefan Richter
2012-04-28 16:02 ` Wakko Warner
2012-04-28 16:55 ` Stefan Richter
-- strict thread matches above, loose matches on Subject: below --
2012-03-09 3:04 Wakko Warner
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