From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758732Ab0FVO15 (ORCPT ); Tue, 22 Jun 2010 10:27:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:23609 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751897Ab0FVO14 (ORCPT ); Tue, 22 Jun 2010 10:27:56 -0400 From: Jeff Moyer To: Vivek Goyal Cc: Jens Axboe , linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] cfq: allow dispatching of both sync and async I/O together References: <1277149789-4493-1-git-send-email-jmoyer@redhat.com> <1277149789-4493-3-git-send-email-jmoyer@redhat.com> <4C1FC4B4.3060700@kernel.dk> <20100621232208.GA10175@redhat.com> <20100622040700.GA12502@redhat.com> <20100622131853.GB13153@redhat.com> X-PGP-KeyID: 1F78E1B4 X-PGP-CertKey: F6FE 280D 8293 F72C 65FD 5A58 1FF8 A7CA 1F78 E1B4 X-PCLoadLetter: What the f**k does that mean? Date: Tue, 22 Jun 2010 10:27:52 -0400 In-Reply-To: <20100622131853.GB13153@redhat.com> (Vivek Goyal's message of "Tue, 22 Jun 2010 09:18:53 -0400") Message-ID: User-Agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Vivek Goyal writes: > On Tue, Jun 22, 2010 at 08:45:54AM -0400, Jeff Moyer wrote: >> Vivek Goyal writes: >> >> > On Mon, Jun 21, 2010 at 07:22:08PM -0400, Vivek Goyal wrote: >> > So looks like firefox launching times have not changed much in the presence >> > of heavy buffered writting going on root disk. I will do more testing tomorrow. >> >> Was the buffered writer actually hitting disk? How much memory is on >> your system? > > I have 4G of memory in the system. I used to wait for 10-15 seconds after > writer has started and then launch firefox to make sure writes are actually > hitting the disk. > > Are you seeing different results in your testing? No, I hadn't got to testing this yet. I was just making sure the test procedure was sane (and it is). Thanks for doing the testing! -Jeff