From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4884FC00449 for ; Wed, 3 Oct 2018 16:00:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06AA42098A for ; Wed, 3 Oct 2018 16:00:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06AA42098A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=acm.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727318AbeJCWts (ORCPT ); Wed, 3 Oct 2018 18:49:48 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:39093 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726819AbeJCWts (ORCPT ); Wed, 3 Oct 2018 18:49:48 -0400 Received: by mail-pf1-f196.google.com with SMTP id c25-v6so1585960pfe.6; Wed, 03 Oct 2018 09:00:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:message-id:subject:from:to:cc:date:in-reply-to :references:mime-version:content-transfer-encoding; bh=m4YtblVfSpRmfDxEHrLlXl4LeahSkGkCCXAgaj5VQ1g=; b=Vr2WXYD2OJuBKGsb1QueAFfCFr/me9H5t/RWcf9IKixdZk3rVIxLlZ5DEVqY6HOIil lXlceV2Rv0CF4lZPYaSiEJoQB/FZIwrqrMV+2Ta310iuDoBXj51TwJjvXjSdWWGiawgX on2g/55KpCzJfHT8hPeGatKNQO2Z2S6gur01y5ZCP0y93++NTXc0fxYnCuWg3S0SWTrc guPOVN6xzS513ryn7ZoeNrIo1rzOPeP0TaWI0O2Kk5PTKDyZiyJpd6dnVp+KD9hri19h 4Ah9dUiA+Z4tiWHbfEdI8NJwbVNp0GpwphZ0pLntoRyVqdq4ma7Ib/JKxwiyR14PX3fy t6uQ== X-Gm-Message-State: ABuFfohUdDwg1ywtRZl9YQ9u9OAhmHuWO5xYDLXnxmP989d1GYz+a753 z4Yk9Ulxz0yFn2BasOz20PE= X-Google-Smtp-Source: ACcGV61NnwdWrRZu6g1Q/HB9ucckXzHsDeLBN6moqhECfXXBVYRnES5ziMpIE2xpKOllYxqgpcuCvg== X-Received: by 2002:a63:fe13:: with SMTP id p19-v6mr1934213pgh.265.1538582448343; Wed, 03 Oct 2018 09:00:48 -0700 (PDT) Received: from ?IPv6:2620:15c:2cd:203:5cdc:422c:7b28:ebb5? ([2620:15c:2cd:203:5cdc:422c:7b28:ebb5]) by smtp.gmail.com with ESMTPSA id u9-v6sm5804193pfi.104.2018.10.03.09.00.47 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 Oct 2018 09:00:47 -0700 (PDT) Message-ID: <1538582446.205649.22.camel@acm.org> Subject: Re: [PATCH] block: BFQ default for single queue devices From: Bart Van Assche To: Paolo Valente , Oleksandr Natalenko Cc: Jens Axboe , Linus Walleij , linux-block , linux-mmc , linux-mtd@lists.infradead.org, Pavel Machek , Ulf Hansson , Richard Weinberger , Artem Bityutskiy , Adrian Hunter , Jan Kara , Andreas Herrmann , Mel Gorman , Chunyan Zhang , linux-kernel , 'Paolo Valente' via bfq-iosched , Mark Brown Date: Wed, 03 Oct 2018 09:00:46 -0700 In-Reply-To: <6AF8CEDE-2720-4206-900A-1A9B914A8FF0@linaro.org> References: <20181002124329.21248-1-linus.walleij@linaro.org> <05fdbe23-ec01-895f-e67e-abff85c1ece2@kernel.dk> <1eca41df95ff660eb247a3de666adeb4@natalenko.name> <6AF8CEDE-2720-4206-900A-1A9B914A8FF0@linaro.org> Content-Type: text/plain; charset="UTF-7" X-Mailer: Evolution 3.26.2-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2018-10-03 at 17:55 +-0200, Paolo Valente wrote: +AD4 The problem, in particular, is that bfq is a complex beast, fighting +AD4 against a jungle of I/O issues. You have to be really into bfq, even +AD4 to just know all of its features+ACE This is a problem by itself. I don't know anyone who wants to have to deal with I/O scheduler tunables. Bart.