From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266284AbUGJPMx (ORCPT ); Sat, 10 Jul 2004 11:12:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266289AbUGJPMx (ORCPT ); Sat, 10 Jul 2004 11:12:53 -0400 Received: from mail014.syd.optusnet.com.au ([211.29.132.160]:2542 "EHLO mail014.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S266284AbUGJPMv (ORCPT ); Sat, 10 Jul 2004 11:12:51 -0400 Message-ID: <40F0075C.2070607@kolivas.org> Date: Sun, 11 Jul 2004 01:12:28 +1000 From: Con Kolivas User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040626) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Arjan van de Ven Subject: Re: [announce] [patch] Voluntary Kernel Preemption Patch References: <20040709182638.GA11310@elte.hu> <20040709195105.GA4807@infradead.org> <20040710124814.GA27345@elte.hu> In-Reply-To: <20040710124814.GA27345@elte.hu> 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="------------enig716F2272FD1B1949B88F87A1" 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) --------------enig716F2272FD1B1949B88F87A1 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit I've conducted some of the old fashioned Benno's latency test on this patch in various sysctl configurations. This was done on top of a different tree but everything else was kept static. I have to preface these results by saying I don't really get the 50ms size latencies normally but I'm usually unable to get better than 3ms so I wasn't sure what to expect. Only the both preempt off showed any "outlying" results with one spike of ~20ms but the rest of the time being ~3ms. Enabling both forms of preempt seemed to help a little but nothing drastic, and never below 1ms. It was not universal that the latencies were better, but there was a trend towards better latency. I suspect that those who are getting huge latencies may see a bigger change with this patch than I did. http://ck.kolivas.org/latency/ Con --------------enig716F2272FD1B1949B88F87A1 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 iD8DBQFA8AdgZUg7+tp6mRURAoDbAJ4jShS/xYL4Zslpl9plqS2metWl9gCfSpDI HV5m8tq2mCXcDjacPdAwM+A= =xAsE -----END PGP SIGNATURE----- --------------enig716F2272FD1B1949B88F87A1--