From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261270AbVFLXE6 (ORCPT ); Sun, 12 Jun 2005 19:04:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261278AbVFLXE6 (ORCPT ); Sun, 12 Jun 2005 19:04:58 -0400 Received: from gateway-1237.mvista.com ([12.44.186.158]:19184 "EHLO av.mvista.com") by vger.kernel.org with ESMTP id S261270AbVFLXE5 (ORCPT ); Sun, 12 Jun 2005 19:04:57 -0400 Subject: Re: PREEMPT_RT vs ADEOS: the numbers, part 1 From: Sven-Thorsten Dietrich To: Andrea Arcangeli Cc: Karim Yaghmour , Ingo Molnar , Kristian Benoit , linux-kernel@vger.kernel.org, paulmck@us.ibm.com, bhuey@lnxw.com, tglx@linutronix.de, pmarques@grupopie.com, bruce@andrew.cmu.edu, nickpiggin@yahoo.com.au, ak@muc.de, dwalker@mvista.com, hch@infradead.org, akpm@osdl.org, rpm@xenomai.org In-Reply-To: <20050612222011.GG5796@g5.random> References: <42AA6A6B.5040907@opersys.com> <20050611191448.GA24152@elte.hu> <42AB662B.4010104@opersys.com> <20050612222011.GG5796@g5.random> Content-Type: text/plain Date: Sun, 12 Jun 2005 16:03:41 -0700 Message-Id: <1118617421.12889.71.camel@sdietrich-xp.vilm.net> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2005-06-13 at 00:20 +0200, Andrea Arcangeli wrote: > On Sat, Jun 11, 2005 at 06:31:07PM -0400, Karim Yaghmour wrote: > > The logger used two TSC values. One prior to shooting the interrupt to the > > target, and one when receiving the response. Responding to an interrupt > > Real life RT apps would run the second rdtsc in user space and not > kernel space, right? > > And thanks for your benchmarking efforts! Real-life RT apps are not benchmarks! There is not requirement for them to run in user space or in kernel space. The choice is left to the application designer.