Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753915AbZIHHKi (ORCPT ); Tue, 8 Sep 2009 03:10:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753876AbZIHHKh (ORCPT ); Tue, 8 Sep 2009 03:10:37 -0400 Received: from mail-pz0-f184.google.com ([209.85.222.184]:51179 "EHLO mail-pz0-f184.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753862AbZIHHKf (ORCPT ); Tue, 8 Sep 2009 03:10:35 -0400 Subject: Re: question on sched-rt group allocation cap: sched_rt_runtime_us Mime-Version: 1.0 (Apple Message framework v1075.2) Content-Type: text/plain; charset=us-ascii; format=flowed; delsp=yes From: Anirban Sinha In-Reply-To: Date: Tue, 8 Sep 2009 00:10:32 -0700 Cc: Anirban Sinha , Anirban Sinha Content-Transfer-Encoding: 7bit Message-Id: <7D542E15-CEA4-43CD-AB4E-48ED103EE7B9@anirban.org> References: <36bbf267-be27-4c9e-b782-91ed32a1dfe9@g1g2000pra.googlegroups.com> <1252218779.6126.17.camel@marge.simson.net> <1252306486.7423.72.camel@marge.simson.net> To: linux-kernel@vger.kernel.org, Ingo Molnar , Peter Zijlstra , Dario Faggioli , Mike Galbraith X-Mailer: Apple Mail (2.1075.2) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1863 Lines: 60 On 2009-09-07, at 9:44 AM, Anirban Sinha wrote: > > > > -----Original Message----- > From: Mike Galbraith [mailto:efault@gmx.de] > Sent: Sun 9/6/2009 11:54 PM > To: Anirban Sinha > Cc: Lucas De Marchi; linux-kernel@vger.kernel.org; Peter Zijlstra; > Ingo Molnar > Subject: RE: question on sched-rt group allocation cap: > sched_rt_runtime_us > > On Sun, 2009-09-06 at 17:18 -0700, Anirban Sinha wrote: > > > > > > > Dunno. Fly or die little patchlet (toss). > > > > > sched: allow the user to disable RT bandwidth aggregation. > > > > Hmm. Interesting. With this change, my results are as follows: > > > > rt_runtime/rt_period % of reg iterations > > > > 0.2 100% > > 0.25 100% > > 0.3 100% > > 0.4 100% > > 0.5 82% > > 0.6 66% > > 0.7 54% > > 0.8 46% > > 0.9 38.5% > > 0.95 32% > > > > > > This results are on a quad core blade. Does it still makes sense > > though? > > Can anyone else run the same tests on a quadcore over the latest > > kernel? I will patch our 2.6.26 kernel with upstream fixes and rerun > > these tests on tuesday. > > I tested tip (v2.6.31-rc9-1357-ge6a3cd0) with a little perturbation > measurement proglet on an isolated Q6600 core. Thanks Mike. Is this on a single core machine (or one core carved out of N)? We may have some newer patches missing from the 2.6.26 kernel that fixes some accounting bugs. I will do a review and rerun the test after applying the upstream patches. Ani -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/