linux-kernel - Re: RAID-1 performance under 2.4 and 2.6

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Message-ID: <e2e108260803260415w64fa4feave44560dd7ac7cbdb@mail.gmail.com>
Date:	Wed, 26 Mar 2008 12:15:57 +0100
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Emmanuel Florac" <eflorac@...ellique.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: RAID-1 performance under 2.4 and 2.6

On Wed, Mar 26, 2008 at 12:07 PM, Emmanuel Florac
<eflorac@...ellique.com> wrote:
> Le Wed, 26 Mar 2008 09:42:19 +0100
>  "Bart Van Assche" <bart.vanassche@...il.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.
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