linux-kernel - Re: RFC: [PATCH] Add a sysfs entry queue/ignore

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Date:	Sun, 11 Sep 2011 07:08:29 +0200
From:	Greg KH <greg@...ah.com>
To:	Anthony DeRobertis <aderobertis@...rics.net>
Cc:	Linux-kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: RFC: [PATCH] Add a sysfs entry queue/ignore_flushes.

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
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