From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266004AbUGJApr (ORCPT ); Fri, 9 Jul 2004 20:45:47 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266038AbUGJApr (ORCPT ); Fri, 9 Jul 2004 20:45:47 -0400 Received: from mail022.syd.optusnet.com.au ([211.29.132.100]:38602 "EHLO mail022.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S266048AbUGJApa (ORCPT ); Fri, 9 Jul 2004 20:45:30 -0400 Message-ID: <40EF3C1C.6080206@kolivas.org> Date: Sat, 10 Jul 2004 10:45:16 +1000 From: Con Kolivas User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040626) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Peter Williams Cc: Andrew Morton , Ingo Molnar , Nick Piggin , linux kernel mailing list Subject: Re: Likelihood of rt_tasks References: <40EE6CC2.8070001@kolivas.org> <40EF2FF2.6000001@bigpond.net.au> <40EF354F.9090903@kolivas.org> <40EF3B3D.9080908@bigpond.net.au> In-Reply-To: <40EF3B3D.9080908@bigpond.net.au> X-Enigmail-Version: 0.84.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig3DCA5A60149C51E464E75860" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig3DCA5A60149C51E464E75860 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Peter Williams wrote: > Con Kolivas wrote: >> - and hitting it frequently enough will be washed over by the cpu as >> Ingo said. I dont think the order of magnitude of this change is in >> the same universe as the problem of scheduling latency that people are >> complaining of. > > > They are talking very small times. No I think you'll find some people are getting jitter and occasional latencies up to 50ms with rt tasks, as evidenced by Ingo's own testing. The problem is bigger than we'd like. Unlikely() would be pushing at worst not even microsecond differences. Con --------------enig3DCA5A60149C51E464E75860 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFA7zwcZUg7+tp6mRURAvSzAJsHC0bA1nMl3edKuO/OEYGUrSUYvgCeP4hh b1KC7IYcDuR5SQwPlqNFcvU= =Yv/L -----END PGP SIGNATURE----- --------------enig3DCA5A60149C51E464E75860--