Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757208AbcJTIBr (ORCPT ); Thu, 20 Oct 2016 04:01:47 -0400 Received: from mail-qk0-f195.google.com ([209.85.220.195]:33984 "EHLO mail-qk0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752274AbcJTIBp (ORCPT ); Thu, 20 Oct 2016 04:01:45 -0400 MIME-Version: 1.0 Reply-To: sedat.dilek@gmail.com In-Reply-To: References: <2198826.9suuMCzPZN@vostro.rjw.lan> From: Sedat Dilek Date: Thu, 20 Oct 2016 10:01:44 +0200 Message-ID: Subject: Re: [4.9-rc1] Build-time 2x slower To: =?UTF-8?Q?J=C3=B6rg_Otte?= Cc: "Rafael J. Wysocki" , Linus Torvalds , "Rafael J. Wysocki" , Michal Marek , Ming Lei , LKML Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id u9K820F1023473 Content-Length: 2582 Lines: 62 On Thu, Oct 20, 2016 at 9:57 AM, Jörg Otte wrote: > 2016-10-19 22:55 GMT+02:00 Rafael J. Wysocki : >> On Wednesday, October 19, 2016 06:59:35 PM Jörg Otte wrote: >>> 2016-10-19 17:29 GMT+02:00 Linus Torvalds : >>> > On Wed, Oct 19, 2016 at 4:07 AM, Jörg Otte wrote: >>> >> >>> >> Additional info: I usally use schedutil governor. >>> >> If I switch to performance governor problems go away. >>> >> Maybe a cpufreq problem? >>> > >>> > Oh, I completely misread the original bug report, and then didn't read >>> > your confirmation email right. >>> > >>> > I thought you had a slower build of the different kernels (when >>> > building on the same kernel), and that the _build_ itself had slowed >>> > down for some reason. But you're actually saying that doing the _same_ >>> > build actually takes longer when running on 4.9-rc1. >>> >>> Exactly! >>> >>> Btw: ondemand governor is also good. >>> >>> > There are a few small cpufreq changes there in between commit >>> > 29fbff8698fc (that you reported was fine - please tell me I got _that_ >>> > right, at least?) and 4.9-rc1. >>> >>> Perfect! That's what I mean. >>> >>> > Adding Rafael to the cc. >>> > >>> > That said, none of them look all that likely to me. It *would* be good >>> > if you could bisect it a bit (perhaps not fully, but a couple of >>> > bisection steps to narrow down what area it is). >>> >>> I try that tomorrow. >> >> Well, please try commit ef98988ba369 (Merge tag 'pm-extra-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm) which is the >> merge introducing the late cpufreq changes. If the issue is there, please >> try to revert commit 899bb6642f2a (cpufreq: skip invalid entries when searching >> the frequency) which is the only cpufreq one that may matter for the schedutil >> governor (and I have one fix for that commit queued up already). >> > > I first tried the merge but git said I'm already uptodate (my tree > is at 1a1891d Merge tag 'for-f2fs-4.9-rc2' of > git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs already) > I guess Rafael meant try his latest linux-pm Git tree with branch and look if the problem still exists. > Then I did the revert of 899bb6642f2a and > that worked fine for me. > Thanks for the feedback! Hope I can try the revert and in a 2nd run the possible fix pending in Rafael's linux-pm.git#linux-next. - Sedat - [1] https://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git/patch/?id=f7a7a80ae30521b65a6dfc98df45d3ec9e238d73