From: "Jose R. Santos" Subject: Re: seekwatcher IO visualization Date: Thu, 9 Aug 2007 22:01:11 -0500 Message-ID: <20070809220111.24d782cd@gara> References: <20070809205355.GB6689@schatzie.adilger.int> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org To: Andreas Dilger Return-path: Received: from e4.ny.us.ibm.com ([32.97.182.144]:54233 "EHLO e4.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751699AbXHJDDv (ORCPT ); Thu, 9 Aug 2007 23:03:51 -0400 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e4.ny.us.ibm.com (8.13.8/8.13.8) with ESMTP id l7A33png013118 for ; Thu, 9 Aug 2007 23:03:51 -0400 Received: from d01av01.pok.ibm.com (d01av01.pok.ibm.com [9.56.224.215]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v8.4) with ESMTP id l7A33ohM439310 for ; Thu, 9 Aug 2007 23:03:51 -0400 Received: from d01av01.pok.ibm.com (loopback [127.0.0.1]) by d01av01.pok.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l7A33oo9000926 for ; Thu, 9 Aug 2007 23:03:50 -0400 In-Reply-To: <20070809205355.GB6689@schatzie.adilger.int> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Thu, 9 Aug 2007 14:53:55 -0600 Andreas Dilger wrote: > I saw on #linuxfs today some graphs and movies by Chris Mason showing > the poor IO locality for ext3 compared to btrfs and XFS. It would be > interesting to run this with ext4+mballoc+delalloc, and a separate > one with the FLEXBG feature enabled to see how that improves the > seeking/locality. > > http://oss.oracle.com/~mason/seekwatcher/ > > Cheers, Andreas > -- > Andreas Dilger > Principal Software Engineer > Cluster File Systems, Inc. > I was planing to use seekwatcher to look at fsck activity when using FLEX_BG since I'm already seeing noticeable improvements by using this feature alone. We can try other workloads and see how ext4 compares. -JRS