From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265692AbUGJQSq (ORCPT ); Sat, 10 Jul 2004 12:18:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265789AbUGJQSq (ORCPT ); Sat, 10 Jul 2004 12:18:46 -0400 Received: from mail001.syd.optusnet.com.au ([211.29.132.142]:32898 "EHLO mail001.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S265692AbUGJQSo (ORCPT ); Sat, 10 Jul 2004 12:18:44 -0400 Message-ID: <40F016D9.8070300@kolivas.org> Date: Sun, 11 Jul 2004 02:18:33 +1000 From: Con Kolivas User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040626) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Con Kolivas Cc: ck kernel mailing list , linux-kernel@vger.kernel.org Subject: Re: [announce] [patch] Voluntary Kernel Preemption Patch References: <20040709182638.GA11310@elte.hu> <20040709195105.GA4807@infradead.org> <20040710124814.GA27345@elte.hu> <40F0075C.2070607@kolivas.org> In-Reply-To: <40F0075C.2070607@kolivas.org> 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="------------enig781F0FF94E94B8AA84B38746" 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) --------------enig781F0FF94E94B8AA84B38746 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Con Kolivas wrote: > 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 Ooops forgot to mention this was running reiserFS 3.6 on software raid0 2x IDE with cfq elevator. Con --------------enig781F0FF94E94B8AA84B38746 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 iD8DBQFA8BbbZUg7+tp6mRURAiJFAJ91HSd22Q8acctC3+mMBSW9zyAEAACcDWNG wFSo3KbA2e/RpvmAUeiGWbk= =YwDv -----END PGP SIGNATURE----- --------------enig781F0FF94E94B8AA84B38746--