Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752841AbYJ0J3e (ORCPT ); Mon, 27 Oct 2008 05:29:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752088AbYJ0J3X (ORCPT ); Mon, 27 Oct 2008 05:29:23 -0400 Received: from mail.gmx.net ([213.165.64.20]:37845 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750863AbYJ0J3X (ORCPT ); Mon, 27 Oct 2008 05:29:23 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX19q8zdwj+5qs19mJHzL3SCg1MwR0Vik8PoKgc4Obn 0TveBRDeLsAtYh Subject: Re: [tbench regression fixes]: digging out smelly deadmen. From: Mike Galbraith To: Jiri Kosina Cc: Andrew Morton , Peter Zijlstra , David Miller , rjw@sisk.pl, Ingo Molnar , s0mbre@tservice.net.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org In-Reply-To: References: <20081024.221653.23695396.davem@davemloft.net> <1224914333.3822.18.camel@marge.simson.net> <1224917623.4929.15.camel@marge.simson.net> <20081025.002420.82739316.davem@davemloft.net> <1225010790.8566.22.camel@marge.simson.net> <1225011648.27415.4.camel@twins> <20081026021153.47878580.akpm@linux-foundation.org> Content-Type: text/plain Date: Mon, 27 Oct 2008 10:29:17 +0100 Message-Id: <1225099757.9642.2.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.22.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.64 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1222 Lines: 34 On Sun, 2008-10-26 at 20:03 +0100, Jiri Kosina wrote: > On Sun, 26 Oct 2008, Andrew Morton wrote: > > > > > > 208.4 MB/sec -- vanilla 2.6.16.60 > > > > > 201.6 MB/sec -- vanilla 2.6.20.1 > > > > > 172.9 MB/sec -- vanilla 2.6.22.19 > > > > > 74.2 MB/sec -- vanilla 2.6.23 > > > > > 46.1 MB/sec -- vanilla 2.6.24.2 > > > > > 30.6 MB/sec -- vanilla 2.6.26.1 > > > > > I.e. huge drop for 2.6.23 (this was with default configs for each > > > > > respective kernel). > > Was this when we decreased the default value of > > /proc/sys/vm/dirty_ratio, perhaps? dbench is sensitive to that. > > 2.6.28 gives 41.8 MB/s with /proc/sys/vm/dirty_ratio == 50. So small > improvement, but still far far away from the throughput of pre-2.6.23 > kernels. How many clients? dbench 160 -t 60 2.6.28-smp (git.today) Throughput 331.718 MB/sec 160 procs (no logjam) Throughput 309.85 MB/sec 160 procs (contains logjam) Throughput 392.746 MB/sec 160 procs (contains logjam) -Mike -- 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/