From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752305Ab3AUWni (ORCPT ); Mon, 21 Jan 2013 17:43:38 -0500 Received: from hydra.sisk.pl ([212.160.235.94]:48573 "EHLO hydra.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751287Ab3AUWnh (ORCPT ); Mon, 21 Jan 2013 17:43:37 -0500 From: "Rafael J. Wysocki" To: Olivier Doucet Cc: Borislav Petkov , linux-kernel@vger.kernel.org Subject: Re: Performance issue since 3.2.6 Date: Mon, 21 Jan 2013 23:49:34 +0100 Message-ID: <18379918.sbmR7uiKVn@vostro.rjw.lan> User-Agent: KMail/4.9.5 (Linux/3.8.0-rc4; KDE/4.9.5; x86_64; ; ) In-Reply-To: References: <2462618.rQxKXSuBtr@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit 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 Monday, January 21, 2013 03:26:10 PM Olivier Doucet wrote: > >> FYI, I benchmarked a new version with : > >> CONFIG_PM_RUNTIME=y > >> CONFIG_PM=y > >> > >> but the performance loss is still present. > > > > In that case it is not quite likely that the commit you bisected to > > really introduced the problem, because it doesn't change things for > > CONFIG_PM=y. > > > > Does reverting that commit still help? > > I tested several combinations. Results follows : > 3.2.6 (base) + CONFIG_PM unset => BAD > 3.2.6 (base) + CONFIG_PM=y => BAD > 3.2.6 (base) + patch reverted + CONFIG_PM=y => BAD > 3.2.6 (base) + patch reverted + CONFIG_PM unset => GOOD I see. Two bugs, then. > So if I understand right, the targeted patch introduced the bug when > CONFIG_PM is unset, but there is an other bug when this var is set. > I'll try to track this commit. Thanks a lot! Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.