Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751086AbZIGGyv (ORCPT ); Mon, 7 Sep 2009 02:54:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750824AbZIGGyv (ORCPT ); Mon, 7 Sep 2009 02:54:51 -0400 Received: from mail.gmx.net ([213.165.64.20]:59541 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750778AbZIGGyu (ORCPT ); Mon, 7 Sep 2009 02:54:50 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX181NGYdlqs18IkOcmK15Qp6PtgEBy85/jM83CuqNY 2RdT3VnUiSfv8o Subject: RE: question on sched-rt group allocation cap: sched_rt_runtime_us From: Mike Galbraith To: Anirban Sinha Cc: Lucas De Marchi , linux-kernel@vger.kernel.org, Peter Zijlstra , Ingo Molnar In-Reply-To: References: <36bbf267-be27-4c9e-b782-91ed32a1dfe9@g1g2000pra.googlegroups.com> <1252218779.6126.17.camel@marge.simson.net> Content-Type: text/plain Date: Mon, 07 Sep 2009 08:54:46 +0200 Message-Id: <1252306486.7423.72.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.58 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1445 Lines: 50 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. 10s measurement interval results: sched_rt_runtime_us RT utilization 950000 94.99% 750000 75.00% 500000 50.04% 250000 25.02% 50000 5.03% Seems to work fine here. -Mike -- 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/