Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757271Ab0GMVAW (ORCPT ); Tue, 13 Jul 2010 17:00:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:18037 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752796Ab0GMVAV (ORCPT ); Tue, 13 Jul 2010 17:00:21 -0400 From: Jeff Moyer To: Vivek Goyal Cc: Corrado Zoccolo , axboe@kernel.dk, Linux-Kernel Subject: Re: [PATCH 0/2] cfq-iosched: fixing RQ_NOIDLE handling. References: <20100713195650.GA21044@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, 13 Jul 2010 17:00:16 -0400 In-Reply-To: (Jeff Moyer's message of "Tue, 13 Jul 2010 16:30:23 -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 Content-Length: 885 Lines: 26 Jeff Moyer writes: > This, of course, raises the question of why the blk_yield patches didn't > run into the same problem. Looking back at some saved traces, I don't > see WBS (write barrier sync) requests, so I wonder if barriers weren't > supported by my last storage system. So, I tested Corrado's approach with -o nobarrier, and here are the results: fs_mark: 363.291 files/sec fio: 38.5 MB/s I don't have time to analyze the data right now, and it's 600MB worth of binary output. If you want, I can upload a representative sample somewhere, let me know. Anyway, I'll post an analysis tomorrow. Cheers, Jeff -- 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/