From: Christoph Hellwig <hch@infradead.org>
To: mark delfman <markdelfman@googlemail.com>
Cc: Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: Re: xfs > md 50% write performance drop on .30+ kernel?
Date: Mon, 12 Oct 2009 21:33:52 -0400 [thread overview]
Message-ID: <20091013013352.GA24869@infradead.org> (raw)
In-Reply-To: <66781b10910120958k4afb637ejba79e4c23900c4da@mail.gmail.com>
On Mon, Oct 12, 2009 at 05:58:20PM +0100, mark delfman wrote:
> Hi... in recent tests we are seeing a 50% drop in performance from
> XFS>MD on a 2.6.30 kernel (compared to a 2.6.28 kernel)
>
> In short: Performance to MD0 direct = circa 1.7GBsec (see below), via
> xfs circa 850MBsec. On previous system (2.6.28) there was no drop in
> performance (in fact often an increase).
>
> I am hopefully that this is simply a matter of barriers etc on the
> newer kernel and MD, but we have tried many options and nothing seems
> to change this so would very much appreciate advice.
Did barrier support for RAID0 got introduced in 2.6.30?
next prev parent reply other threads:[~2009-10-13 1:33 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-12 16:58 xfs > md 50% write performance drop on .30+ kernel? mark delfman
2009-10-12 18:40 ` Richard Scobie
2009-10-13 1:33 ` Christoph Hellwig [this message]
2009-10-13 1:57 ` NeilBrown
2009-10-13 11:06 ` mark delfman
2009-10-13 11:09 ` Majed B.
[not found] ` <66781b10910130412x309d9de2l574ba12a9ed4100a@mail.gmail.com>
2009-10-13 11:15 ` Majed B.
2009-10-13 11:29 ` mark delfman
2009-10-13 14:30 ` Asdo
2009-10-13 15:13 ` mark delfman
2009-10-13 15:15 ` mark delfman
2009-10-13 22:52 ` Christoph Hellwig
2009-10-14 19:34 ` mark delfman
2009-10-27 10:28 ` Thomas Fjellstrom
2009-10-27 11:11 ` Thomas Fjellstrom
2010-01-02 6:54 ` fibre raid
2009-10-13 3:38 ` Richard Scobie
2009-10-13 10:21 ` Asdo
2009-10-13 10:34 ` Mikael Abrahamsson
2009-10-13 14:49 ` Asdo
2009-10-13 19:53 ` Richard Scobie
2009-10-13 21:52 ` mark delfman
2009-10-13 18:49 ` Greg Freemyer
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