Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751925AbdHGRfj (ORCPT ); Mon, 7 Aug 2017 13:35:39 -0400 Received: from mail-wr0-f169.google.com ([209.85.128.169]:38195 "EHLO mail-wr0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751532AbdHGRfh (ORCPT ); Mon, 7 Aug 2017 13:35:37 -0400 Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: Switching to MQ by default may generate some bug reports From: Paolo Valente In-Reply-To: <20170805115404.vsrb3zuapskes3zi@techsingularity.net> Date: Mon, 7 Aug 2017 19:35:32 +0200 Cc: Christoph Hellwig , Jens Axboe , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org Message-Id: <3FBAC9F0-740C-40E5-AC16-E299E7F1D9A1@linaro.org> References: <20170803085115.r2jfz2lofy5spfdb@techsingularity.net> <1B2E3D98-1152-413F-84A9-B3DAC5A528E8@linaro.org> <20170803110144.vvadm3cc5oetf7up@techsingularity.net> <4B181ED1-8605-4156-9BBF-B61A165BE7F5@linaro.org> <20170804110103.oljdzsy7bds6qylo@techsingularity.net> <34B4C2EB-18B2-4EAB-9BBC-8095603D733D@linaro.org> <20170805115404.vsrb3zuapskes3zi@techsingularity.net> To: Mel Gorman X-Mailer: Apple Mail (2.3124) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v77HZi45021670 Content-Length: 1029 Lines: 29 > Il giorno 05 ago 2017, alle ore 13:54, Mel Gorman ha scritto: > ... > >> In addition, as for coverage, we made the empiric assumption that >> start-up time measured with each of the above easy-to-benchmark >> applications gives an idea of the time that it would take with any >> application of the same size and complexity. User feedback confirmed >> this assumptions so far. Of course there may well be exceptions. >> > > FWIW, I also have anecdotal evidence from at least one user that using > BFQ is way better on their desktop than CFQ ever was even under the best > of circumstances. I've had problems directly measuring it empirically but > this was also the first time I switched on BFQ to see what fell out so > it's early days yet. > Yeah, I'm constantly trying (without great success so far :) ) to turn this folklore into shared, repeatable tests and numbers. The latter could then be reliably evaluated, questioned or defended. Thanks, Paolo > -- > Mel Gorman > SUSE Labs