From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757312AbXIZN6R (ORCPT ); Wed, 26 Sep 2007 09:58:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752657AbXIZN6D (ORCPT ); Wed, 26 Sep 2007 09:58:03 -0400 Received: from E23SMTP02.au.ibm.com ([202.81.18.163]:56871 "EHLO e23smtp02.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751948AbXIZN6B (ORCPT ); Wed, 26 Sep 2007 09:58:01 -0400 Date: Wed, 26 Sep 2007 16:47:44 +0530 To: Jaswinder Singh Cc: hufey , linux-kernel@vger.kernel.org, mingo@elte.hu, dmitry.adamushko@gmail.com, a.p.zijlstra@chello.nl, randy.dunlap@oracle.com, efault@gmx.de, akpm@linux-foundation.org, vatsa@linux.vnet.ibm.com, dhaval@linux.vnet.ibm.com Subject: Re: realtime preemption performance difference Message-ID: <20070926111744.GA18438@in.ibm.com> Reply-To: Ankita Garg References: <3f9a31f40709240448h4a9e8337t437328b5c675ecd5@mail.gmail.com> <88dfed9d0709241427v329aeed9jfbc298666ac483c8@mail.gmail.com> <3f9a31f40709260011i1416d287h5d0da001dd77fbfb@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3f9a31f40709260011i1416d287h5d0da001dd77fbfb@mail.gmail.com> User-Agent: Mutt/1.5.13 (2006-08-11) From: ankita@in.ibm.com (Ankita Garg) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi Jaswinder, On Wed, Sep 26, 2007 at 12:41:57PM +0530, Jaswinder Singh wrote: > hello hufey, > > I am not using montavista kernel, I am using standard linux kernel. > > Realtime is known by worst case latencies. Ingo and team are claiming > for realtime support so their should be some samples and performance > numbers, > You can obtain several -rt testcases from the RT wiki: http://rt.wiki.kernel.org/index.php/Main_Page Here we have testcases/benchmarks for measuring scheduling latencies, priority preemption, signaling latencies, etc and other important information on the patchset. Hope this helps! > Can someone please share their samples and/or numbers. > > Thank you, > > Jaswinder Singh. > > On 9/25/07, hufey wrote: > > On 9/24/07, Jaswinder Singh wrote: > > > Hi all, > > > > > > I want to check performance difference by using realtime preemption patch : > > > > > > http://www.kernel.org/pub/linux/kernel/projects/rt/ > > > > > > Please let me know from where I can download samples to test realtime > > > preemption performance difference. > > > > > > > As far as I know, some embedded linux vendors such as MontaVista > > provide kernel patch to export some interfaces to measure realtime > > performance. > > > > > Can someone please share performance numbers for your hardware:- > > > > > > 1. Interrupt latency > > > 2. Task switching time > > > 3. hard-realtime scheduling latency > > > > > > Thank you, > > > > > > Jaswinder Singh. > > > - > > > 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/ > > > > > > - > 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/ > -- Regards, Ankita Garg (ankita@in.ibm.com) Linux Technology Center IBM India Systems & Technology Labs, Bangalore, India