Re: [Gelato-technical] Serious performance degradation on a RAID withkernel 2.6.11

From: Andreas Hirstius <>
Date: 2005-04-07 04:57:39
David Mosberger wrote:

>>>>>>On Wed, 06 Apr 2005 10:33:07 +0200, Andreas Hirstius <> said:
>  Andreas> But the driver in questions is 3w-9xxx and there have been
>  Andreas> no chances at all in this driver between 2.6.10 and
>  Andreas> 2.6.12-rc1. The changed driver in -rc2 still has the
>  Andreas> problem.  And I've tried the driver built-in and as a
>  Andreas> module (default)...
>Are you sure the problem is due to the driver and not RAID0?  What if
>you dd directly from the underlying device?
To make sure it's not the md/raid I just took the driver/md directory 
from 2.6.9 and 2.6.10 and used it in 2.6.11 ==> no change in behaviour ...
(The changes in md.c are minor and there are no changes in raid0.c 
between .10 and .11 anyway)

As I say on the webpage, a dd on the underlying devices works fine...

It might still be a higher level interface to the md, that's wrong.

And I'm not saying that it's the 3w-9xx driver!! It hasn't changed 
between 2.6.10 and 2.6.11, so pretty much impossible to introduce bugs 
(It was just mentioned wrt to the fusion-mpt driver.)


>	--david
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Received on Wed Apr 6 14:58:02 2005

This archive was generated by hypermail 2.1.8 : 2005-08-02 09:20:37 EST