From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936832Ab0COVOt (ORCPT ); Mon, 15 Mar 2010 17:14:49 -0400 Received: from karif.server-speed.net ([188.40.51.140]:39798 "EHLO karif.server-speed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S936780Ab0COVOr (ORCPT ); Mon, 15 Mar 2010 17:14:47 -0400 X-Greylist: delayed 479 seconds by postgrey-1.27 at vger.kernel.org; Mon, 15 Mar 2010 17:14:47 EDT Message-ID: <4B9EA162.2000706@server-speed.net> Date: Mon, 15 Mar 2010 22:06:42 +0100 From: Florian Pritz Organization: Server-Speed Network User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100301 Shredder/3.0.3 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org CC: sxxe@gmx.de, thomas@archlinux.org Subject: Bad performance after suspend on Intel i7 and i5 X-Enigmail-Version: 1.0 OpenPGP: id=4CE1C13E; url=http://bluewind.at/stuff/other/0x4ce1c13e-pub.asc Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, When I run make -j12 (on a kernel tree) all 8 cores are at 100% each. (Can also be tested with stress -c 8 or any multithreaded program) After a suspend2ram (using pm-suspend) only one single core is at 100% and the others are somewhere between 0% and 10% though not 100% like before. This bug is reproduceable on at least 3 machines, running on i7-920, i7-860 and i5-520M. Tested kernels are 2.6.33-ARCH (config [1]) , 2.6.32.9-ARCH and 2.6.34-rc1-00005-g522dba7 (only be me; config [2]). /proc/cpuinfo shows 8 cpus before and after suspend. My own hardware: CPU: Intel i7-920 Board: Gigabyte GA-EX58-UD4P [3] RAM: 8GB Arch: x86_64 (all 3) Distribution: Archlinux (all 3) I don't know of any older good kernel, so sadly can't bisect anything. Thanks for looking into that issue. [1] http://repos.archlinux.org/wsvn/packages/kernel26/trunk/config.x86_64?rev=70484&peg=70484 [2] http://flo.xssn.at/~flo/tmp/kernel-config [3] http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=2986 -- Greetings, Florian Pritz -- {flo,bluewind}@server-speed.net