From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761916AbcJSUsn convert rfc822-to-8bit (ORCPT ); Wed, 19 Oct 2016 16:48:43 -0400 Received: from cloudserver094114.home.net.pl ([79.96.170.134]:60979 "HELO cloudserver094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754105AbcJSUsm (ORCPT ); Wed, 19 Oct 2016 16:48:42 -0400 From: "Rafael J. Wysocki" To: =?ISO-8859-1?Q?J=F6rg?= Otte Cc: Linus Torvalds , "Rafael J. Wysocki" , Michal Marek , Sedat Dilek , Ming Lei , LKML Subject: Re: [4.9-rc1] Build-time 2x slower Date: Wed, 19 Oct 2016 22:55:36 +0200 Message-ID: <2198826.9suuMCzPZN@vostro.rjw.lan> User-Agent: KMail/4.11.5 (Linux/4.8.0-rc2+; KDE/4.11.5; x86_64; ; ) In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8BIT Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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). Thanks, Rafael