From: Wakko Warner <wakko@animx.eu.org>
To: Johan de Jong <jrdejong@gmail.com>
Cc: linux-kernel@vger.kernel.org, Thomas Schmitt <scdbackup@gmx.net>
Subject: Re: SCSI sr driver: parallel writes to optical serialized which hurts performance (sr_mutex)
Date: Sat, 5 Mar 2016 16:25:17 -0500 [thread overview]
Message-ID: <20160305212517.GA6030@animx.eu.org> (raw)
In-Reply-To: <CAHrxqh3pGJzVoxtgNgmbVSdwXSiH2cLGYpU4R2+eDEEfaHxi7A@mail.gmail.com>
Johan de Jong wrote:
> In the mean time I have applied and tested the 2013 patch by Otto Meta:
>
> http://marc.info/?l=linux-scsi&m=135705061804384&w=2
>
> which, in short, replaces mutex_lock(&sr_mutex) (global mutex), that
> was introduced in 2010 to replace lock_kernel(), by per-device mutexes
> and allowing concurrent ioctl(SG_IO) in different processes with
> different sr devices.
There seems to be a few patches floating around. I've had one running on
3.3.0 for a long time w/o any issues. I'm currently using the one from Tim
Small (Search for subject Fix performance burning or extracting audio etc.
from multiple optical drives.) on 4.x (where x is 3-4) and a 3.14.something
without any issues.
I still have the emails from Tim. My current usage is 2 systems with 3
burners from the same source.
next prev parent reply other threads:[~2016-03-05 21:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-01 11:00 SCSI sr driver: parallel writes to optical serialized which hurts performance (sr_mutex) Johan de Jong
2016-03-05 20:15 ` Johan de Jong
2016-03-05 20:47 ` Thomas Schmitt
2016-03-07 12:13 ` One Thousand Gnomes
2016-03-07 13:11 ` Thomas Schmitt
2016-03-05 21:25 ` Wakko Warner [this message]
2016-03-05 21:36 ` Johan de Jong
2016-03-06 2:06 ` Wakko Warner
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