Re: RAID-1 performance under 2.4 and 2.6

[Bart Van Assche]

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