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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160305212517.GA6030@animx.eu.org \
--to=wakko@animx.eu.org \
--cc=jrdejong@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=scdbackup@gmx.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox