Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S944870AbcJSP3T (ORCPT ); Wed, 19 Oct 2016 11:29:19 -0400 Received: from mail-oi0-f67.google.com ([209.85.218.67]:34330 "EHLO mail-oi0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941719AbcJSP3Q (ORCPT ); Wed, 19 Oct 2016 11:29:16 -0400 MIME-Version: 1.0 In-Reply-To: References: From: Linus Torvalds Date: Wed, 19 Oct 2016 08:29:14 -0700 X-Google-Sender-Auth: yfDC_HyXa4fs6UN6CJFqTLUxhWg Message-ID: Subject: Re: [4.9-rc1] Build-time 2x slower To: =?UTF-8?Q?J=C3=B6rg_Otte?= , "Rafael J. Wysocki" Cc: 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 u9JFTUUk018142 Content-Length: 979 Lines: 25 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. My bad. 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. 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). Linus