From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750920AbWEHXyg (ORCPT ); Mon, 8 May 2006 19:54:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750918AbWEHXyg (ORCPT ); Mon, 8 May 2006 19:54:36 -0400 Received: from fmr20.intel.com ([134.134.136.19]:29156 "EHLO orsfmr005.jf.intel.com") by vger.kernel.org with ESMTP id S1750836AbWEHXyg (ORCPT ); Mon, 8 May 2006 19:54:36 -0400 Subject: Regression seen for patch "sched:dont decrease idle sleep avg" From: Tim Chen Reply-To: tim.c.chen@linux.intel.com To: kernel@kolivas.org, linux-kernel@vger.kernel.org Content-Type: text/plain Organization: Intel Date: Mon, 08 May 2006 16:18:18 -0700 Message-Id: <1147130298.30649.33.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-8) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con, As a result of the patch "sched:dont decrease idle sleep avg" introduced after 2.6.15, there is a 4% drop in Volanomark throughput on our Itanium test machine. Probably the following happened: Compared to previous code, this patch slightly increases the the priority boost when a job is woken up. This adds priority spread and variations to the wait time of jobs on run queue if we have a lot of similar jobs in the system. See patch: http://www.kernel.org/git/? p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e72ff0bb2c163eb13014ba113701bd42dab382fe Regards, Tim