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=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_MED 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 5DAECECE560 for ; Fri, 14 Sep 2018 19:06:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F226A2146E for ; Fri, 14 Sep 2018 19:06:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=kernel-dk.20150623.gappssmtp.com header.i=@kernel-dk.20150623.gappssmtp.com header.b="JW+vjphJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F226A2146E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.dk 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 S1727749AbeIOAWU (ORCPT ); Fri, 14 Sep 2018 20:22:20 -0400 Received: from mail-it0-f68.google.com ([209.85.214.68]:55333 "EHLO mail-it0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726787AbeIOAWU (ORCPT ); Fri, 14 Sep 2018 20:22:20 -0400 Received: by mail-it0-f68.google.com with SMTP id d10-v6so3976089itj.5 for ; Fri, 14 Sep 2018 12:06:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=mQFPS94BnKD57gUiTfyHX78cEwS1VVYuF5uvjetV0bM=; b=JW+vjphJxMlZ9PcGD2weKveYvm1yVcRLD+Kml21wN2Yk2Hu6cFZUpKQ32xFYK2Gzl/ dDACLJZZGc1GHlVxHR66Oqw3PGwo4R0rwRlVWOIk9/IMkn2lXXRgRMAs3xlDMaSe3G1e 1hW9zfbiOxyYTGo3Dv0n9HWjI6bfAzAulGhqRVFXSQ8AaNVgQrf0p4gOgIQ6A7n3IO23 D/WWtRGJXcBnTkZ5/oZJYk8V3UIuuSCE8tBYtUfJ/NNBZSMMiKQVLBHvWwYOpzVDF9Bf oXNH4wfhsVeJU2lNderS/lCgfGrSIsJd41hcou7FPzL8WVg4buz/3pZEfzJaHhOg5z6w bq3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=mQFPS94BnKD57gUiTfyHX78cEwS1VVYuF5uvjetV0bM=; b=GzsAH32J1/wAe28Nz332aL2lTxMlYUYCthRn2TISXWCcAHGt5KpPneuR2n3TJKzRhq o21SW3OHkP4al2ij4kxQ2USwQY6+BydvUmz7yqrKw0oF0NRc/E0X8kpaF/tilNs0DVS2 xSHJB2UnWmaSyyRoRnRKxX70mde1lRr/LaCeRBSyY2h9FI1RJMT0UJTuJPT/pfOANSD4 0UF1M9jPIaXAi+AI+TvWwWabhfOWooosHLrJnN/haJ03Tx79x76oPvT0l+IqCeysQN33 CRgbd9uU8BvkjcXAuvtVtDuQvS0F6I2ip/Woo+WNxw3qt/yowGuIi6lPqKNwb+dhh2Db F8Dg== X-Gm-Message-State: APzg51BxdLf3nV6rrUwiZKJSM4ZFuhfyevBnnQ1aWNJ1A9+tvRtrzzwP o9oY42Xo1TGD6sp+65E6ffHnsQ== X-Google-Smtp-Source: ANB0VdZtFhUSzYs8MBGFkrJ5FSwyBdZbQZuMOBIumhq5n6Pxg0XqHDxt25CGJpdgHNgQB8BvYrDHlg== X-Received: by 2002:a24:ecc1:: with SMTP id g184-v6mr2595791ith.79.1536951991318; Fri, 14 Sep 2018 12:06:31 -0700 (PDT) Received: from [192.168.1.56] ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id v14-v6sm2762047iog.42.2018.09.14.12.06.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Sep 2018 12:06:30 -0700 (PDT) Subject: Re: [PATCH BUGFIX/IMPROVEMENT 0/3] bfq: one fix and two important improvements for throughput To: Paolo Valente Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ulf.hansson@linaro.org, linus.walleij@linaro.org, broonie@kernel.org, bfq-iosched@googlegroups.com, oleksandr@natalenko.name References: <20180914142309.6789-1-paolo.valente@linaro.org> From: Jens Axboe Message-ID: Date: Fri, 14 Sep 2018 13:06:29 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: <20180914142309.6789-1-paolo.valente@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 9/14/18 8:23 AM, Paolo Valente wrote: > Hi Jens, > the second and third patch in this series provide two important > improvements in bfq's ability to boost throughput with random I/O. The > benefits of the second patch concern I/O control, and are described in > detail in this LWN article [1] (and briefly in the commit message > itself). The benefits of the other patch should be > straightforward. Finally, the first patch fixes an I/O-control bug, > found while making the second patch. > > These patches modify somehow core operations of bfq, so, before > submitting them, I have tested them a lot, and have had them tested by > other people too. In particular, during these months, they have been > tested in systems ranging from PCs to development platforms. Applied for 4.20, thanks Paolo. -- Jens Axboe