From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Richter Subject: Re: Burning multiple DVDs at one time Date: Sat, 17 Mar 2012 13:47:56 +0100 Message-ID: <20120317134756.7a9ea99c@stein> References: <20120315225310.GB3152@animx.eu.org> <20120317095644.145d0588@stein> <20120317115324.10b39bb7@galadriel.home> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from einhorn.in-berlin.de ([192.109.42.8]:56552 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752061Ab2CQMsb convert rfc822-to-8bit (ORCPT ); Sat, 17 Mar 2012 08:48:31 -0400 In-Reply-To: <20120317115324.10b39bb7@galadriel.home> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Emmanuel Florac Cc: Wakko Warner , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org On Mar 17 Emmanuel Florac wrote: > Le Sat, 17 Mar 2012 09:56:44 +0100 vous =C3=A9criviez: >=20 > > 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=20 >=20 > 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 whethe= r 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.) --=20 Stefan Richter -=3D=3D=3D=3D=3D-=3D=3D=3D-- --=3D=3D =3D---=3D http://arcgraph.de/sr/ -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html