From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Hirstius Date: Wed, 06 Apr 2005 18:57:39 +0000 Subject: Re: [Gelato-technical] Serious performance degradation on a RAID Message-Id: <42543123.3080905@cern.ch> List-Id: References: <16978.62532.841151.100745@napali.hpl.hp.com> In-Reply-To: <16978.62532.841151.100745@napali.hpl.hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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 there... (It was just mentioned wrt to the fusion-mpt driver.) Andreas > --david > > >