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=-1.0 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 D1492C43441 for ; Thu, 15 Nov 2018 02:56:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9BD7C22360 for ; Thu, 15 Nov 2018 02:56:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9BD7C22360 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=rjwysocki.net 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 S1728333AbeKONCZ (ORCPT ); Thu, 15 Nov 2018 08:02:25 -0500 Received: from cloudserver094114.home.pl ([79.96.170.134]:49957 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725895AbeKONCZ (ORCPT ); Thu, 15 Nov 2018 08:02:25 -0500 Received: from 64.114.255.114 (64.114.255.114) (HELO aspire.rjw.lan) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.83.148) id 2012e768b2f7a9c1; Thu, 15 Nov 2018 03:56:25 +0100 From: "Rafael J. Wysocki" To: Giovanni Gherdovich Cc: Linux PM , Doug Smythies , Srinivas Pandruvada , Peter Zijlstra , LKML , Frederic Weisbecker , Mel Gorman , Daniel Lezcano Subject: Re: [RFC/RFT][PATCH v5] cpuidle: New timer events oriented governor for tickless systems Date: Thu, 15 Nov 2018 03:56:33 +0100 Message-ID: <9662418.c5ysHFetnm@aspire.rjw.lan> In-Reply-To: <1541877001.17878.5.camel@suse.cz> References: <102783770.7hZjAahU8c@aspire.rjw.lan> <1541877001.17878.5.camel@suse.cz> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday, November 10, 2018 8:10:01 PM CET Giovanni Gherdovich wrote: > On Thu, 2018-11-08 at 18:25 +0100, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki > > Subject: [PATCH] cpuidle: New timer events oriented governor for tickless systems > > [cut] > [NOTE: the tables in this message are quite wide, ~130 columns. If this > doesn't get to you properly formatted you can read a copy of this message at > the URL https://beta.suse.com/private/ggherdovich/teo-eval/teo-eval.html ] > > > Hello Rafael, > > I have results for v3 and v5. Regarding v4, I made a mistake and didn't get > valid data; as I saw v5 coming shortly after, I didn't rerun v4. > > I'm replying to the v5 thread because that's where these results belong, but > I'm quoting your text from the v2 email at > https://lore.kernel.org/lkml/4168371.zz0pVZtGOY@aspire.rjw.lan so that's > easier to follow along. Thanks for the results, much appreciated! > The quick summary is: > > ---> sockperf on loopback over UDP, mode "throughput": > this had a 12% regression in v2 on 48x-HASWELL-NUMA, which is completely > recovered in v3 and v5. Good stuff. That's good news, thanks! > ---> dbench on xfs: > this was down 16% in v2 on 48x-HASWELL-NUMA. On v5 we're at a 10% > regression. Slight improvement. What's really hurting here is the single > client scenario. > > ---> netperf-udp on loopback: > had 6% regression on v2 on 8x-SKYLAKE-UMA, which is the same as what > happens in v5. > > ---> tbench on loopback: > was down 10% in v2 on 8x-SKYLAKE-UMA, now slightly worse in v5 with a 12% > regression. As in dbench, it's at low number of clients that the results > are worst. Note that this machine is different from the one that has the > dbench regression. Clearly, playing with the pattern detection part of the governor alone is not sufficient to make all of the workloads happy at the same time. > A more detailed report follows below. > > I maintain my original opinion from v2 that this governor is largely > performance-neutral and I'm not overly worried about the numbers above: OK, fair enough. Cheers, Rafael