From: "Bart Van Assche" <bart.vanassche@gmail.com>
To: "Emmanuel Florac" <eflorac@intellique.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: RAID-1 performance under 2.4 and 2.6
Date: Wed, 26 Mar 2008 12:15:57 +0100 [thread overview]
Message-ID: <e2e108260803260415w64fa4feave44560dd7ac7cbdb@mail.gmail.com> (raw)
In-Reply-To: <20080326120713.24cb8093@harpe.intellique.com>
On Wed, Mar 26, 2008 at 12:07 PM, Emmanuel Florac
<eflorac@intellique.com> wrote:
> Le Wed, 26 Mar 2008 09:42:19 +0100
> "Bart Van Assche" <bart.vanassche@gmail.com> écrivait:
>
> > Keep in mind that the above test tests two subsystems at the same
> > time: RAID-1 + the filesystem on top of it.
>
> I'm using XFS usually, and I've also checked against the raw devices
> and it looks the same (2.4 still faster). I must add that the difference
> is somewhat reduced when using a single disk drive vs. RAID-1,
> obviously due to different buffering policy in the RAID subsystem.
You are welcome to post the numbers you obtained with dd for direct
I/O on a RAID-1 setup for 2.4 versus 2.6 kernel.
Bart.
next prev parent reply other threads:[~2008-03-26 11:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-25 18:43 Emmanuel Florac
2008-03-25 22:00 ` Chris Snook
2008-03-25 22:09 ` Emmanuel Florac
2008-03-25 22:47 ` Bill Davidsen
2008-03-25 23:13 ` Chris Snook
2008-03-25 23:42 ` Bill Davidsen
2008-03-26 8:05 ` Emmanuel Florac
2008-03-26 8:25 ` "J.A. Magallón"
2008-03-27 21:49 ` Bill Davidsen
2008-03-26 16:51 ` Chris Snook
2008-03-26 16:39 ` Chris Snook
2008-07-16 14:52 ` Pádraig Brady
2008-07-16 18:18 ` Chris Snook
2008-03-26 7:15 ` Bart Van Assche
2008-03-26 7:56 ` Emmanuel Florac
2008-03-27 21:53 ` Bill Davidsen
2008-03-28 7:44 ` Bart Van Assche
2008-03-28 12:04 ` Bill Davidsen
2008-03-25 22:37 ` Bill Davidsen
2008-03-26 8:42 ` Bart Van Assche
2008-03-26 11:07 ` Emmanuel Florac
2008-03-26 11:15 ` Bart Van Assche [this message]
2008-03-26 12:36 ` Emmanuel Florac
2008-03-26 13:22 ` Bart Van Assche
2008-03-27 22:03 ` Bill Davidsen
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