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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 1942BC3A589 for ; Tue, 20 Aug 2019 15:19:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E39A3216F4 for ; Tue, 20 Aug 2019 15:19:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1566314352; bh=Q4tsNIwJpNT6pPk+ksybwyAjwvuVCv3Qw0XIIzLSW2M=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=MIKZN6VSD4iqpIgDCyPOff+UUh21EYi0/X12KNmKLrY/yb8NBNhojv1C3dvsQafnR m2xo1oMkiTlvDa3LtFoah52QdTcZaYVhiAAMnxj+uCFVsKm/5CTtbTqIi7LFjcv9Ik By6d2AtE9qYPZ7NudMVK9tJT1Q6hehjFldihtzdw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730370AbfHTPTI (ORCPT ); Tue, 20 Aug 2019 11:19:08 -0400 Received: from mail-qt1-f193.google.com ([209.85.160.193]:44270 "EHLO mail-qt1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730356AbfHTPTH (ORCPT ); Tue, 20 Aug 2019 11:19:07 -0400 Received: by mail-qt1-f193.google.com with SMTP id 44so6417395qtg.11; Tue, 20 Aug 2019 08:19:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=c+ytF9JRpx+c+jH7VEntcNHapqJkhUT6uddNW8eq0CI=; b=j/1N4ekm9zWh5OV8A5seiIkduZDfjViU9YztBjbBDi/ScXALSStzfFPCDm2ywBgFj8 AORxFbVW4sevVDpQebSL2W1ZojiMi+XLadvgTE3WCgc7EXGi+LOyEqH8QbHkcuPB8M6w IUTsf8zPnnBepJEIZ/O4HkfQjDt4ZNMqlk3lL6TsEqpC208NnZkb26y6clD8vPNbUxpF nzYJe9/TAMcTTEx4+jtfLT5n3UfKgN64VgK23qGqtcjtUVCFIZP5TO7t2fS5zVa60L80 1h+LaGlzWQF8Gzp8ZMe7GR4lpBYwpXxxGot+HkJHKIGWwXc7E45B5XlcOCUfhxLDy/5c DxWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:from:to:cc:subject:message-id :references:mime-version:content-disposition:in-reply-to:user-agent; bh=c+ytF9JRpx+c+jH7VEntcNHapqJkhUT6uddNW8eq0CI=; b=ZRaxFO9Q6GxP22hyqnP8HHrnzhKb1imJyGJUNGpPfFcBOar79PjNgw1tfcD20RbTDb WJFyASzegDgrS2J18/ZpXEyAgjU5JzeRLxjbkbk6GtC2PTqBzjzaV2f6DiAsutKlEhHv BAkurQlVnM0+eWWWAKzenZGr8rAZ7riD2F+Ep2XZzro35Sj4kXVzKpCn19VbxTokBnZf LbiJw/8MFbEIwDvB4pBLcJIT4pUTCby9o4Gf1skXWoBU/mMpjIXMHgug50XVGLv62j20 jDLIc5LySRy4jydgUyUhpFwddxySLiGZHQ3SuweT7Wm6XeZBf/2ZNa3LIo+ST/ufXBOl CpBA== X-Gm-Message-State: APjAAAUTj+ZqbYoBhGG9ulwNyAwQIZSciH2eIkULBWyszSrk9duT0c+/ i+HbSkU+9GKiFlARk5jCDJk= X-Google-Smtp-Source: APXvYqyWuXwXMjQGCXY671Qo8mOEainLlVJu27sHZeN0PwMV+DobUfF0v5Dvll39J+tn5aaHlVKmpw== X-Received: by 2002:a05:6214:130d:: with SMTP id a13mr14780230qvv.113.1566314346304; Tue, 20 Aug 2019 08:19:06 -0700 (PDT) Received: from localhost ([2620:10d:c091:500::1:4c8f]) by smtp.gmail.com with ESMTPSA id m9sm8417177qtp.27.2019.08.20.08.19.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 20 Aug 2019 08:19:05 -0700 (PDT) Date: Tue, 20 Aug 2019 08:19:03 -0700 From: Tejun Heo To: Paolo Valente Cc: Jens Axboe , newella@fb.com, clm@fb.com, Josef Bacik , dennisz@fb.com, Li Zefan , Johannes Weiner , linux-kernel , linux-block , kernel-team@fb.com, cgroups@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, bpf@vger.kernel.org Subject: Re: [PATCHSET block/for-next] IO cost model based work-conserving porportional controller Message-ID: <20190820151903.GH2263813@devbig004.ftw2.facebook.com> References: <20190614015620.1587672-1-tj@kernel.org> <20190614175642.GA657710@devbig004.ftw2.facebook.com> <5A63F937-F7B5-4D09-9DB4-C73D6F571D50@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Archived-At: List-Archive: List-Post: Hello, Paolo. On Tue, Aug 20, 2019 at 05:04:25PM +0200, Paolo Valente wrote: > and makes one fio instance generate I/O for each group. The bandwidth > reported above is that reported by the fio instance emulating the > target client. > > Am I missing something? If you didn't configure QoS targets, the controller is using device qdepth saturation as the sole guidance in determining whether the device needs throttling. Please try configuring the target latencies. The bandwidth you see for single stream of rand ios should have direct correlation with how the latency targets are configured. The head letter for the patchset has some examples. Thanks. -- tejun