Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S942045AbcJSQ7j (ORCPT ); Wed, 19 Oct 2016 12:59:39 -0400 Received: from mail-oi0-f46.google.com ([209.85.218.46]:36678 "EHLO mail-oi0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941180AbcJSQ7h (ORCPT ); Wed, 19 Oct 2016 12:59:37 -0400 MIME-Version: 1.0 In-Reply-To: References: From: =?UTF-8?Q?J=C3=B6rg_Otte?= Date: Wed, 19 Oct 2016 18:59:35 +0200 Message-ID: Subject: Re: [4.9-rc1] Build-time 2x slower To: Linus Torvalds Cc: "Rafael J. Wysocki" , Michal Marek , Sedat Dilek , 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 u9JGxhDD019563 Content-Length: 1164 Lines: 34 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. Jörg