From: Richard Scobie <richard@sauce.co.nz>
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: Tue, 13 Oct 2009 16:38:55 +1300 [thread overview]
Message-ID: <4AD3F64F.6070908@sauce.co.nz> (raw)
In-Reply-To: <66781b10910120958k4afb637ejba79e4c23900c4da@mail.gmail.com>
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)
Richard Scobie wrote:
> Started testing a similar machine yesterday - 12GB RAM LSI SAS
> controller and 16 x WD RE3 1TB SATA md RAID6.
>
> With stripe cache set to 16384, I see dd writes of around 290MB/s and
> when bumped up to 32768 (the maximum), it increases to 407MB.
An omission to the above - the machine is running
kernel-2.6.30.8-64.fc11.x86_64.
Regards,
Richard
next prev parent reply other threads:[~2009-10-13 3:38 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
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 [this message]
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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