From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263585AbUEWUkk (ORCPT ); Sun, 23 May 2004 16:40:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263588AbUEWUkk (ORCPT ); Sun, 23 May 2004 16:40:40 -0400 Received: from mail-relay-2.tiscali.it ([212.123.84.92]:37797 "EHLO mail-relay-2.tiscali.it") by vger.kernel.org with ESMTP id S263585AbUEWUki (ORCPT ); Sun, 23 May 2004 16:40:38 -0400 From: Lorenzo Allegrucci Organization: -ENOENT To: Jens Axboe Subject: Re: 2.6.6-mm5 oops mounting ext3 or reiserfs with -o barrier Date: Sun, 23 May 2004 22:41:13 +0200 User-Agent: KMail/1.6.2 Cc: Andrew Morton , linux-kernel@vger.kernel.org References: <200405222107.55505.l_allegrucci@despammed.com> <200405231917.52517.l_allegrucci@despammed.com> <20040523173100.GA9914@suse.de> In-Reply-To: <20040523173100.GA9914@suse.de> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200405232241.14069.l_allegrucci@despammed.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sunday 23 May 2004 19:31, Jens Axboe wrote: > It just looks odd that eg reads vary as much as they do, and that -o > barrier=1 makes -W0 reads faster (and faster then -W1 even). remove > looks reasonable for -W1, but -W0 is still faster. That is _really_ odd. I rerun all tests with noatime. Using noatime numbers look more predictable but I cannot guarantee any statistical relevance. hdparm -W1 ext3 (-o barrier=0,noatime) untar read copy remove 0m56.744s 0m22.452s 1m26.558s 0m20.683s 0m7.187s 0m1.153s 0m0.747s 0m0.101s 0m6.077s 0m3.045s 0m9.132s 0m1.907s ext3 (-o barrier=1,noatime) untar read copy remove 0m55.152s 0m21.340s 1m23.705s 0m19.369s 0m7.237s 0m1.217s 0m0.788s 0m0.077s 0m6.513s 0m3.082s 0m9.226s 0m1.507s haparm -W0 ext3 (-o barrier=0,noatime) untar read copy remove 1m55.221s 0m23.768s 2m12.458s 0m22.256s 0m7.227s 0m1.216s 0m0.756s 0m0.085s 0m6.424s 0m3.002s 0m9.085s 0m1.560s ext3 (-o barrier=1,noatime) untar read copy remove 1m56.578s 0m23.382s 2m14.117s 0m22.289s 0m7.035s 0m1.202s 0m0.766s 0m0.089s 0m6.814s 0m3.103s 0m9.141s 0m1.696s -- Lorenzo