From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751981AbZHaOHV (ORCPT ); Mon, 31 Aug 2009 10:07:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751501AbZHaOHV (ORCPT ); Mon, 31 Aug 2009 10:07:21 -0400 Received: from mga14.intel.com ([143.182.124.37]:56955 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751012AbZHaOHU (ORCPT ); Mon, 31 Aug 2009 10:07:20 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.44,271,1249282800"; d="scan'208";a="182354744" Date: Mon, 31 Aug 2009 22:07:13 +0800 From: Wu Fengguang To: Fernando Silveira Cc: "linux-kernel@vger.kernel.org" Subject: Re: I/O and pdflush Message-ID: <20090831140713.GA24185@localhost> References: <6afc6d4a0907111027w76234c8fv11ab77864515fdb0@mail.gmail.com> <20090712080410.GA8512@localhost> <6afc6d4a0908281448s537aa315jcb79b27453cf4279@mail.gmail.com> <20090829101247.GA20786@localhost> <20090829102126.GA22409@localhost> <6afc6d4a0908310624j47f9d8c7h47d98ecd95811883@mail.gmail.com> <20090831140006.GA23668@localhost> <20090831140113.GA24005@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090831140113.GA24005@localhost> 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 On Mon, Aug 31, 2009 at 10:01:13PM +0800, Wu Fengguang wrote: > On Mon, Aug 31, 2009 at 10:00:06PM +0800, Wu Fengguang wrote: > > Hi Fernando, > > > > What's your SSD's IO parameters? Ie. output of this command: > > > > grep -r . /sys/block/sda/queue/ > > > > Please replace 'sda' with your SSD device name. > > Oh I guess it's sdc: > > grep -r . /sys/block/sdc/queue/ BTW, would you run "iostat -x 1 5" (which will run 5 seconds) when doing I/O in ideal throughput, and when in 25MB/s thoughput state? Thanks, Fengguang