From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: Re: Ext3 sequential read performance drop 2.6.29 -> 2.6.30,2.6.31,... Date: Tue, 3 Nov 2009 05:06:45 -0500 Message-ID: <20091103100645.GA13118@infradead.org> References: <20091013120955.6bd5844b@smartjog.com> <20091102135554.b10ece3e.akpm@linux-foundation.org> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-fsdevel@vger.kernel.org, linux-raid@vger.kernel.org, Laurent CORBES , linux-kernel@vger.kernel.org To: device-mapper development Return-path: Content-Disposition: inline In-Reply-To: <20091102135554.b10ece3e.akpm@linux-foundation.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com List-Id: linux-fsdevel.vger.kernel.org On Mon, Nov 02, 2009 at 01:55:54PM -0800, Andrew Morton wrote: > On Tue, 13 Oct 2009 12:09:55 +0200 > Laurent CORBES wrote: > > > Hi all, > > > > While benchmarking some systems I discover a big sequential read performance > > drop using ext3 on ~ big files. The drop seems to be introduced in 2.6.30. I'm > > testing with 2.6.28.6 -> 2.6.29.6 -> 2.6.30.4 -> 2.6.31.3. > > Seems that large performance regressions aren't of interest to this > list :( No sure which list you mean, but dm-devel is for dm, not md. We're also seeing similarly massive performance drops with md and ext3/xfs as already reported on the list. Someone tracked it down to writeback changes as usual, but there it got stuck.