From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760931AbZE3Qrl (ORCPT ); Sat, 30 May 2009 12:47:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752270AbZE3Qrd (ORCPT ); Sat, 30 May 2009 12:47:33 -0400 Received: from mail-ew0-f176.google.com ([209.85.219.176]:48814 "EHLO mail-ew0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752113AbZE3Qrc convert rfc822-to-8bit (ORCPT ); Sat, 30 May 2009 12:47:32 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:cc:references:in-reply-to :mime-version:content-disposition:message-id:content-type :content-transfer-encoding; b=rmsbOYZK+pdJwkPJ46a6fY7n7IcoTQQjsfz9c9VDz2ZZAebS681ZFcbIENgJHeGDH5 XIDhIF/eY8zlWLnHwfXZBsxtZwLXAH8+AULCFdlm1rVHlncJIDsugLUSLc4Zmwy1ddLA 321U/YoiMOGYNcjJxImRnzpkvwNiujz5WPf58= From: Diego Calleja To: Andrew Morton Subject: Re: Performance regressions in 2.6.30-rc7? Date: Sat, 30 May 2009 18:51:47 +0200 User-Agent: KMail/1.11.2 (Linux/2.6.30-rc4-00187-gb4348f3; KDE/4.2.2; x86_64; ; ) Cc: linux-kernel@vger.kernel.org References: <200905282249.28592.diegocg@gmail.com> <20090529210718.bef7a9c1.akpm@linux-foundation.org> In-Reply-To: <20090529210718.bef7a9c1.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200905301851.47708.diegocg@gmail.com> Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sábado 30 Mayo 2009 06:07:18 Andrew Morton escribió: > Those regressions are huge. They appear to be on compute-intensive > workloads too. > > I wonder if some expensive debugging option turned itself on or > something silly like that. They use the vanilla kernels that ubuntu ship with their own configs, so they shouldn't be using any expensive debugging option. I've run myself two of those tests (I've not tested gnupg as I'm allergic to it). I can't reproduce any regression with 7zip, I'm however able to reproduce the regression in tiobench write latency, using 32 threads and 64 MB block size (--threads 32 --block 65536). I used ext4 (phoronix uses ext3). Random Writes File Blk Num Avg Maximum Lat% Lat% CPU Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff ---------------------------- ------ ----- --- ------ ------ --------- ----------- -------- -------- ----- 2.6.29 2000 65536 32 24.16 107.2% 0.051 0.21 0.00000 0.00000 23 Random Writes File Blk Num Avg Maximum Lat% Lat% CPU Identifier Size Size Thr Rate (CPU%) Latency Latency >2s >10s Eff ---------------------------- ------ ----- --- ------ ------ --------- ----------- -------- -------- ----- 2.6.30-rc7-00149-g3218911 2000 65536 32 23.06 178.4% 0.711 164.72 0.00000 0.00000 13