From: Greg KH <greg@kroah.com>
To: Anthony DeRobertis <aderobertis@metrics.net>
Cc: Linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: RFC: [PATCH] Add a sysfs entry queue/ignore_flushes.
Date: Sun, 11 Sep 2011 07:08:29 +0200 [thread overview]
Message-ID: <20110911050829.GA15269@kroah.com> (raw)
In-Reply-To: <4E6A783D.9040708@metrics.net>
On Fri, Sep 09, 2011 at 04:34:05PM -0400, Anthony DeRobertis wrote:
> I have an Oracle workload that ran quite fast under 2.6.32 due to mdraid
> not supporting barriers. 2.6.33 slowed it down very substantially, and
> its remains slow in 3.1. (Oracle is running on raw LVM logical volumes,
> not filesystems, so ext4 barrier=0 doesn't help).
>
> This patch adds a sysfs attribute to allow flush/fua to to turned off
> (ignored) on a per-block-device basis. I have tested it on both a VM and
> real hardware.
>
> I'm not sure that queue_flags is the best place to put the bit, seems
> like it may more logically go in flush_flags, but everything else is in
> queue_flags.
>
> I'm not subscribed, but will be looking for replies via list archives.
> Feel free to CC me.
If you add/remove/change sysfs attributes, you also need to do the same
to Documentation/ABI.
thanks,
greg k-h
next prev parent reply other threads:[~2011-09-11 5:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-09 20:34 RFC: [PATCH] Add a sysfs entry queue/ignore_flushes Anthony DeRobertis
2011-09-11 5:08 ` Greg KH [this message]
2011-09-12 15:43 ` Anthony DeRobertis
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