From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Schwebel Subject: Re: Which version of preempt_realtime to use? Date: Tue, 20 Jan 2009 08:49:03 +0100 Message-ID: <20090120074903.GX29067@pengutronix.de> References: <1232366467.31686.10.camel@localhost.localdomain> <49748567.30201@osadl.org> <4974E686.60105@hedrich-winders.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Carsten Emde , esn@terma.com, linux-rt-users@vger.kernel.org To: =?iso-8859-15?Q?J=FCrgen?= Mell Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:39092 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753002AbZATHta (ORCPT ); Tue, 20 Jan 2009 02:49:30 -0500 Content-Disposition: inline In-Reply-To: <4974E686.60105@hedrich-winders.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: J=FCrgen, On Mon, Jan 19, 2009 at 09:45:58PM +0100, J=FCrgen Mell wrote: > The only thing which is missing for me from the 2.6.24.7-rt series is > the patch > "x86-fpu-fix-config_preempt-y-corruption-of-application-s-fpu-stack.p= atch" > , GIT commit > 870568b39064cab2dd971fe57969916036982862 from mainline 2.6.25. This > might cause trouble with applications which are using floating point > arithmetics. Otherwise I am using the 2.6.24.7-rt series on a machine > control for a 16 axes machine and it is working mostly well. There ar= e > only some points where I get big delays (up to some milliseconds) wit= h > my timer routine, where normally delays are below 50 microseconds. Up= to > now I could not find the application ( X ??) which is causing this. Can you reproduce these long latencies with cyclictest, or does it only happen with your code? rsc --=20 Pengutronix e.K. | = | Industrial Linux Solutions | http://www.pengutronix.de/= | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 = | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-555= 5 | -- To unsubscribe from this list: send the line "unsubscribe linux-rt-user= s" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html