Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934166AbYAaSM0 (ORCPT ); Thu, 31 Jan 2008 13:12:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759315AbYAaSMS (ORCPT ); Thu, 31 Jan 2008 13:12:18 -0500 Received: from emroute1.ornl.gov ([160.91.4.119]:45613 "EHLO emroute1.ornl.gov" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754212AbYAaSMR (ORCPT ); Thu, 31 Jan 2008 13:12:17 -0500 Date: Thu, 31 Jan 2008 13:12:15 -0500 From: David Dillow Subject: Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel In-reply-to: To: Bart Van Assche Cc: landman@scalableinformatics.com, Vladislav Bolkhovitin , James.Bottomley@hansenpartnership.com, linux-scsi@vger.kernel.org, rdreier@cisco.com, linux-kernel@vger.kernel.org, "Nicholas A. Bellinger" , fujita.tomonori@lab.ntt.co.jp, scst-devel@lists.sourceforge.net, akpm@linux-foundation.org, FUJITA Tomonori , torvalds@linux-foundation.org Message-id: <1201803135.21160.8.camel@lap75545.ornl.gov> Organization: Oak Ridge National Laboratory MIME-version: 1.0 X-Mailer: Evolution 2.12.3 (2.12.3-1.fc8) Content-type: text/plain Content-transfer-encoding: 7bit References: <20080130083239E.fujita.tomonori@lab.ntt.co.jp> <20080130195635T.tomof@acm.org> <1201785938.7280.105.camel@haakon2.linux-iscsi.org> <47A1EE54.6000005@vlnb.net> <47A1F67C.4020300@scalableinformatics.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1168 Lines: 33 On Thu, 2008-01-31 at 18:08 +0100, Bart Van Assche wrote: > If anyone has a suggestion for a better test than dd to compare the > performance of SCSI storage protocols, please let it know. xdd on /dev/sda, sdb, etc. using -dio to do direct IO seems to work decently, though it is hard (ie, impossible) to get a repeatable sequence of IO when using higher queue depths, as it uses threads to generate multiple requests. You may also look at sgpdd_survey from Lustre's iokit, but I've not done much with that -- it uses the sg devices to send lowlevel SCSI commands. I've been playing around with some benchmark code using libaio, but it's not in generally usable shape. xdd: http://www.ioperformance.com/products.htm Lustre IO Kit: http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-20-1.html -- Dave Dillow National Center for Computational Science Oak Ridge National Laboratory (865) 241-6602 office -- 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/