Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759082AbZF2Ow1 (ORCPT ); Mon, 29 Jun 2009 10:52:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751226AbZF2OwS (ORCPT ); Mon, 29 Jun 2009 10:52:18 -0400 Received: from mga14.intel.com ([143.182.124.37]:26262 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750860AbZF2OwR (ORCPT ); Mon, 29 Jun 2009 10:52:17 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.42,309,1243839600"; d="scan'208";a="159613640" Date: Mon, 29 Jun 2009 22:51:47 +0800 From: Wu Fengguang To: Ronald Moesbergen Cc: Vladislav Bolkhovitin , Andrew Morton , "kosaki.motohiro@jp.fujitsu.com" , "Alan.Brunelle@hp.com" , "hifumi.hisashi@oss.ntt.co.jp" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "jens.axboe@oracle.com" , "randy.dunlap@oracle.com" , Bart Van Assche Subject: Re: [RESEND] [PATCH] readahead:add blk_run_backing_dev Message-ID: <20090629145147.GA29433@localhost> References: <20090620035504.GA19516@localhost> <4A3CD62B.1020407@vlnb.net> <20090629093423.GB1315@localhost> <4A489DAC.7000007@vlnb.net> <20090629125434.GA8416@localhost> <4A48BBF9.6050408@vlnb.net> <20090629131326.GA23668@localhost> <20090629132841.GA26171@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1682 Lines: 41 On Mon, Jun 29, 2009 at 10:43:48PM +0800, Ronald Moesbergen wrote: > 2009/6/29 Wu Fengguang : > > On Mon, Jun 29, 2009 at 09:13:27PM +0800, Wu Fengguang wrote: > >> On Mon, Jun 29, 2009 at 09:04:57PM +0800, Vladislav Bolkhovitin wrote: > >> > Wu Fengguang, on 06/29/2009 04:54 PM wrote: > >> > > > >> > > Why not 2.6.30? :) > >> > > >> > We started with 2.6.29, so why not complete with it (to save additional > >> > Ronald's effort to move on 2.6.30)? > >> > >> OK, that's fair enough. > > > > btw, I backported the 2.6.31 context readahead patches to 2.6.29, just > > in case it will help the SCST performance. > > > > Ronald, if you run context readahead, please make sure that the server > > side readahead size is bigger than the client side readahead size. > > I tried this patch on a vanilla kernel and no other patches applied, > but it does not seem to help. The iSCSI throughput does not go above > 60MB/s. (1GB in 17 seconds). I have tried several readahead settings > from 128KB up to 4MB and kept the server readahead at twice the client > readahead, but it never comes above 60MB/s. This is using SCST on the OK, thanks for the tests anyway! > serverside and openiscsi on the client. I get much better throughput > (90 MB/s) when using the patches supplied with SCST, together with the What do you mean by "patches supplied with SCST"? > blk_run_backing_dev readahead patch. Thanks, Fengguang -- 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/