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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 07548ECE587 for ; Mon, 14 Oct 2019 14:53:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D40D121835 for ; Mon, 14 Oct 2019 14:53:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="GcuQCSLc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733091AbfJNOxX (ORCPT ); Mon, 14 Oct 2019 10:53:23 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:45448 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733046AbfJNOxX (ORCPT ); Mon, 14 Oct 2019 10:53:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=aprOO2dgw1K43UzA/6LtwK92aryQcTNoIiM6Tk9Yuj0=; b=GcuQCSLcFZ4lgc/il9+oqzW/f 4gUDA7S7Z3j1/6y7jQ6vbvJ/yTshB+YvutZLbxbH42VvXA8GhmXqbu24MXfUbEx1gAHSBwk8pNxO0 QhXBbHHTtG5VRp9B5aDLijCZOmeDl+Q297LtT3NlY4DEvUV2ofghK2Xl/ebBLzJJSoqWyYwlpL5xd O2klhThUbQeYjh99M8U2dNfLzg0EzhSHj/4C4croiVT4MCZcBOB7EiRose7VfbheFjKGuu9e8oFrO /PtXVv9l9jdhywElSitniWBwbkWbakeT5IGI+MMt6gF2nneH8KPI008DHYaqVjdJslanDH8BHjgXJ 2dZSJLjZg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iK1in-0002Bn-Rb; Mon, 14 Oct 2019 14:53:18 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id C4EB4305BD3; Mon, 14 Oct 2019 16:52:21 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D959A2023039A; Mon, 14 Oct 2019 16:53:15 +0200 (CEST) Date: Mon, 14 Oct 2019 16:53:15 +0200 From: Peter Zijlstra To: Douglas RAILLARD Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, mingo@redhat.com, rjw@rjwysocki.net, viresh.kumar@linaro.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, qperret@qperret.net, patrick.bellasi@matbug.net, dh.han@samsung.com Subject: Re: [RFC PATCH v3 0/6] sched/cpufreq: Make schedutil energy aware Message-ID: <20191014145315.GZ2311@hirez.programming.kicks-ass.net> References: <20191011134500.235736-1-douglas.raillard@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191011134500.235736-1-douglas.raillard@arm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Fri, Oct 11, 2019 at 02:44:54PM +0100, Douglas RAILLARD wrote: > This has been ligthly tested with a rtapp task ramping from 10% to 75% > utilisation on a big core. Results are improved by fast ramp-up > EWMA [1], since it greatly reduces the oscillation in frequency at first > idle when ramping up. > > [1] [PATCH] sched/fair: util_est: fast ramp-up EWMA on utilization increases > Message-ID: <20190620150555.15717-1-patrick.bellasi@arm.com> > https://lore.kernel.org/lkml/20190620150555.15717-1-patrick.bellasi@arm.com/ I don't really see anything fundamentally weird here. Any actual numbers or other means of quantifying the improvement these patches bring?