From: "Holger Hoffstaette" <holger.hoffstaette@googlemail.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: btrfs scrub ioprio
Date: Tue, 26 Nov 2013 01:50:15 +0100 [thread overview]
Message-ID: <pan.2013.11.26.00.50.14.749597@googlemail.com> (raw)
In-Reply-To: 5292C7F7.8010200@jrs-s.net
On Sun, 24 Nov 2013 22:45:59 -0500, Jim Salter wrote:
> TL;DR scrub's ioprio argument isn't really helpful - a scrub murders
> system performance til it's done.
>
> My system:
>
> 3.11 kernel (from Ubuntu Saucy)
I don't run Ubuntu, but *maybe* they use the deadline IO scheduler by
default, which does not handle IO priorities (by design). So maybe make
sure your devices don't say "deadline" in /sys/block/sdX/queue/scheduler,
and if they do, set them to cfq.
-h
next prev parent reply other threads:[~2013-11-26 0:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-25 3:45 btrfs scrub ioprio Jim Salter
2013-11-25 12:25 ` Austin S Hemmelgarn
2013-11-25 12:55 ` Jim Salter
2013-11-25 13:05 ` Austin S Hemmelgarn
2013-11-26 0:50 ` Holger Hoffstaette [this message]
2014-01-19 13:49 ` Kai Krakow
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