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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6FE29C43217 for ; Wed, 12 Oct 2022 08:04:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229852AbiJLIER (ORCPT ); Wed, 12 Oct 2022 04:04:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52064 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229680AbiJLIEP (ORCPT ); Wed, 12 Oct 2022 04:04:15 -0400 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06216B2D87; Wed, 12 Oct 2022 01:04:08 -0700 (PDT) Received: by mail-pf1-x42e.google.com with SMTP id f140so15834958pfa.1; Wed, 12 Oct 2022 01:04:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=bgBbUs8TofhAMyCRBKzVfzUcwrUVLCp8g4mhXCX29EI=; b=RYdBLO9dY/gqXlXYXxFu9ncK7sNQqO2zp3qjR5bFPMisLHOEPQCfgZyKsP/Qw5EfRf NpgqkFHXwjefsMRE2wqTz+DuEzSOQK9YoOgknK7fc2aPljAd6DFP1XWJh05EAHjFehSC veyjXjO5ZOfUbcQZwtQFrbBqZ6JoHZDVZfgRMp88sVhEg+rljopvmeqHnJ+fDCcRkfM6 0lhZjSyrq4jBmWJ4ygaeNhwVXXooPDXftXmB3lsiX8gkuHfhvaD0z9IU4yFOSWogCa5T 9ZGPIH61gyXj0aE43sNbWrjLQje0yXVhxpcsutyL/RolAY5yfrclLXOzhBkHIFQCKVux N+Ag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=bgBbUs8TofhAMyCRBKzVfzUcwrUVLCp8g4mhXCX29EI=; b=Uhs6Wl2gfQVEawIkSJYn6TKsZblRtlpIe5Xi9ZyBbdRFZNxpFVO6soicb4/duVaR9h m/xTCDou6knpAJ3dT5N1pMgwhqCPEM51orRnfHQSwUMM99v1+zOu3w8FEyPL5IGsfoAb w1MHjzyIRMOkeZ24sTBzBWcpmZnNUuRzJV39f3c6o0nNLIFUBvR1eFJEAMnagob34KhG WM5Jshmiv/iryk375I2hjyB50SUhJpb7vVTnZkb1+94uNKtZWjQYFKQh1zPiX8tLD4Kf Ok+bQtYvWEt6XyQKy44P+T+Oc4lG9yrwXxtOaQl1AzvzsX/GNb3vDi3zqoxOkmLgWs/Y 6XIg== X-Gm-Message-State: ACrzQf3dxFqdwQqGFsTDyos6DqAKFFqZla4/nLUl5vC2C60uQ4gnqXiK 1bGsQjCBvv+aKfIO5X60FKA= X-Google-Smtp-Source: AMsMyM5/gFPR44XKYIVSRUkh9qrb45lwI7Kt3s1rCkjgSgs2yzBwhsXyWvJp1lq+ljSddsECRDH1wg== X-Received: by 2002:a05:6a00:22d1:b0:562:5d7d:5588 with SMTP id f17-20020a056a0022d100b005625d7d5588mr30138916pfj.58.1665561847849; Wed, 12 Oct 2022 01:04:07 -0700 (PDT) Received: from localhost (2603-800c-1a02-1bae-a7fa-157f-969a-4cde.res6.spectrum.com. [2603:800c:1a02:1bae:a7fa:157f:969a:4cde]) by smtp.gmail.com with ESMTPSA id p5-20020a170902e74500b0017f73caf588sm9984934plf.218.2022.10.12.01.04.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 Oct 2022 01:04:07 -0700 (PDT) Sender: Tejun Heo Date: Tue, 11 Oct 2022 22:04:05 -1000 From: Tejun Heo To: Yu Kuai Cc: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yi.zhang@huawei.com, "yukuai (C)" Subject: Re: [PATCH -next 4/5] blk-iocost: bypass if only one cgroup issues io Message-ID: References: <20221011083547.1831389-1-yukuai1@huaweicloud.com> <20221011083547.1831389-5-yukuai1@huaweicloud.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 12, 2022 at 09:33:46AM +0800, Yu Kuai wrote: > Perhaps a suitable configuration can avoid this problem. Yeah, iocost is a throttling controller. The default parameters try to be adaptive but it really needs benchmarked parameters to work properly. Thanks. -- tejun