From: Eric Sandeen Subject: Re: More testing: 4x parallel 2G writes, sequential reads Date: Wed, 07 Nov 2007 21:39:33 -0600 Message-ID: <473284F5.4010000@redhat.com> References: <47323F73.5080708@redhat.com> <20071107230905.GQ3966@webber.adilger.int> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: Eric Sandeen , ext4 development Return-path: Received: from mx1.redhat.com ([66.187.233.31]:52274 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754123AbXKHDjh (ORCPT ); Wed, 7 Nov 2007 22:39:37 -0500 Received: from int-mx1.corp.redhat.com (int-mx1.corp.redhat.com [172.16.52.254]) by mx1.redhat.com (8.13.8/8.13.1) with ESMTP id lA83dabb010547 for ; Wed, 7 Nov 2007 22:39:36 -0500 Received: from pobox-2.corp.redhat.com (pobox-2.corp.redhat.com [10.11.255.15]) by int-mx1.corp.redhat.com (8.13.1/8.13.1) with ESMTP id lA83daFk030788 for ; Wed, 7 Nov 2007 22:39:36 -0500 In-Reply-To: <20071107230905.GQ3966@webber.adilger.int> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org Andreas Dilger wrote: > The test shows ext4 finishing marginally faster in the write case, and > marginally slower in the read case. What happens if you have 4 parallel > readers? http://people.redhat.com/esandeen/seekwatcher/ext4_4_thread_par_read.png http://people.redhat.com/esandeen/seekwatcher/xfs_4_thread_par_read.png http://people.redhat.com/esandeen/seekwatcher/ext4_xfs_4_thread_par_read.png -Eric