Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754535AbYAQMrM (ORCPT ); Thu, 17 Jan 2008 07:47:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751298AbYAQMq4 (ORCPT ); Thu, 17 Jan 2008 07:46:56 -0500 Received: from metis.extern.pengutronix.de ([83.236.181.26]:48098 "EHLO metis.extern.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756777AbYAQMqx (ORCPT ); Thu, 17 Jan 2008 07:46:53 -0500 Date: Thu, 17 Jan 2008 13:46:47 +0100 From: Luotao Fu To: Wolfgang Grandegger Cc: Steven Rostedt , LKML , RT , Ingo Molnar , Thomas Gleixner Subject: Re: 2.6.24-rc8-rt1 Message-ID: <20080117124647.GK5859@pengutronix.de> Mail-Followup-To: Wolfgang Grandegger , Steven Rostedt , LKML , RT , Ingo Molnar , Thomas Gleixner References: <1200544050.318.18.camel@localhost.localdomain> <478F2A46.5070506@grandegger.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="zH41lVBEV8cLJnCl" Content-Disposition: inline In-Reply-To: <478F2A46.5070506@grandegger.com> X-PGP-Key-ID: 0xE5325261 X-URL: http://www.pengutronix.de/ X-Sent-From: Pengutronix Entwicklungszentrum Nord - Hildesheim X-IRC: #ptxdist @freenode X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-Impressum: Pengutronix - Linux Solutions for Science and Industry Handelsregister: Amtsgericht Hildesheim, HRA 2686 Hannoversche Str. 2, 31134 Hildesheim, Germany Phone: +49-5121-206917-0 | Fax: +49-5121-206917-9 Inhaber: Dipl.-Ing. Robert Schwebel X-Message-Flag: See Message Headers for Impressum X-Uptime: 13:40:06 up 10 days, 4:29, 1 user, load average: 0.69, 0.61, 0.68 User-Agent: Mutt/1.5.16 (2007-06-11) X-SA-Exim-Connect-IP: 10.1.0.69 X-SA-Exim-Mail-From: l.fu@pengutronix.de X-SA-Exim-Scanned: No (on metis.extern.pengutronix.de); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2018 Lines: 63 --zH41lVBEV8cLJnCl Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Wolfgang, On Thu, Jan 17, 2008 at 11:13:26AM +0100, Wolfgang Grandegger wrote: > Steven Rostedt wrote: > It builds and runs fine on my Icecube-MPC5200 board, now also with the > latency tracer enabled. That's great. Still, "cyclictest -n -p80 -i1000" > reports latencies up to 400 us and therefore I tried to trigger and save > a high latency trace using: >=20 > # ./cyclictest -n -p80 -i1000 -b400 > 1.21 0.33 0.11 4/42 1048 >=20 > T: 0 ( 914) P:80 I:1000 C: 38726 Min: 61 Act: 107 Avg: 106 > Max: 377 > [ 91.042169] ( cyclictest-914 |#0): new 39733427 us user-latenc= y. > bash-3.00# cat /proc/latency_trace > trace.log >=20 I tested 2.6.24-rc8-rt1 on our phytec phyCORE-MPC5200B-tiny. I runned cycli= ctest with exactly the same parameter as you used and made some non-rt Workload w= ith "hackbench 5" in a while 1 loop and a "ping -f" from a host machine. I run = the test for about 3 hours and could not push the latency to higher than 220 us. (The latency tracer is also turned on in kernel). Could you please send me = your kernelconfig privately? cheers Luotao Fu --=20 Dipl.-Ing. Luotao Fu | Phone: +49-5121-206917-3 Pengutronix - Linux Solutions for Science and Industry Entwicklungszentrum Nord http://www.pengutronix.de --zH41lVBEV8cLJnCl Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFHj040iruQY+UyUmERAoIUAJ4kJ6+H8iWtWoqg9X0RDq8uFXqDPQCeJT18 7ykRHYirV77EzkuphzvN7ro= =JFyf -----END PGP SIGNATURE----- --zH41lVBEV8cLJnCl-- -- 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/