Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763275AbXEPUQr (ORCPT ); Wed, 16 May 2007 16:16:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757277AbXEPUQk (ORCPT ); Wed, 16 May 2007 16:16:40 -0400 Received: from agminet01.oracle.com ([141.146.126.228]:34332 "EHLO agminet01.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758640AbXEPUQk (ORCPT ); Wed, 16 May 2007 16:16:40 -0400 Date: Wed, 16 May 2007 16:14:14 -0400 From: Chris Mason To: Andrew Morton Cc: Chuck Ebbert , linux-kernel@vger.kernel.org Subject: Re: filesystem benchmarking fun Message-ID: <20070516201414.GF26766@think.oraclecorp.com> References: <20070516144205.GV26766@think.oraclecorp.com> <464B2AC2.10206@redhat.com> <20070516171156.GY26766@think.oraclecorp.com> <20070516112515.b6f247b2.akpm@linux-foundation.org> <20070516191339.GA26766@think.oraclecorp.com> <20070516123342.714a11d8.akpm@linux-foundation.org> <20070516195359.GE26766@think.oraclecorp.com> <20070516130413.1fd391bf.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070516130413.1fd391bf.akpm@linux-foundation.org> User-Agent: Mutt/1.5.12-2006-07-14 X-Whitelist: TRUE X-Whitelist: TRUE X-Brightmail-Tracker: AAAAAQAAAAI= Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1201 Lines: 29 On Wed, May 16, 2007 at 01:04:13PM -0700, Andrew Morton wrote: > > The good news is that if you let it run long enough, the times > > stabilize. The bad news is: > > > > create dir kernel-86 222MB in 15.85 seconds (14.03 MB/s) > > create dir kernel-87 222MB in 28.67 seconds (7.76 MB/s) > > create dir kernel-88 222MB in 18.12 seconds (12.27 MB/s) > > create dir kernel-89 222MB in 19.77 seconds (11.25 MB/s) > > well hang on. Doesn't this just mean that the first few runs were writing > into pagecache and the later ones were blocking due to dirty-memory limits? > > Or do you have a sync in there? > There's no sync, but if you watch vmstat you can clearly see the log flushes, even when the overall create times are 11MB/s. vmstat goes 30MB/s -> 4MB/s or less, then back up to 30MB/s. On the same box, my shiny new FS writes at 30MB/s the whole time. For this part of the benchmark, I think we should all be getting the same numbers. -chris - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/