From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933383AbXCOCbL (ORCPT ); Wed, 14 Mar 2007 22:31:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933388AbXCOCbL (ORCPT ); Wed, 14 Mar 2007 22:31:11 -0400 Received: from mga01.intel.com ([192.55.52.88]:44395 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933383AbXCOCbK (ORCPT ); Wed, 14 Mar 2007 22:31:10 -0400 X-ExtLoop1: 1 X-IronPort-AV: i="4.14,286,1170662400"; d="scan'208"; a="212857118:sNHT23067996" Date: Wed, 14 Mar 2007 19:31:03 -0700 From: "Siddha, Suresh B" To: Con Kolivas Cc: linux kernel mailing list , ck list Subject: Re: RSDL v0.30 cpu scheduler for mainline kernels Message-ID: <20070315023102.GL30596@linux-os.sc.intel.com> References: <200703121058.11966.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200703121058.11966.kernel@kolivas.org> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con, On Mon, Mar 12, 2007 at 10:58:11AM +1100, Con Kolivas wrote: > There are updated patches for 2.6.20, 2.6.20.2, 2.6.21-rc3 and 2.6.21-rc3-mm2 > to bring RSDL up to version 0.30 for download here: I tried this on a Core 2 Quad cpu system(system has 4 cores on a single package). When I run SPECjbb2000 with number of threads varying from 1-8, I see ~4.5% perf regression with RSDL (compared to native 2.6.21-rc3) in the 8 threads case. This I think, is coming from increased number of context switches, when we have more than one thread(at same user priority) on the same logical cpu. Just to see the % increase in number of context switches, I ran 8 infinite loops (simple while(1); 's) and with 2.6.21-rc3 I see ~70 context switches every second, whereas with RSDL I see ~530 context switches. thanks, suresh