From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753883AbYHKN3l (ORCPT ); Mon, 11 Aug 2008 09:29:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753197AbYHKN30 (ORCPT ); Mon, 11 Aug 2008 09:29:26 -0400 Received: from victor.provo.novell.com ([137.65.250.26]:58796 "EHLO victor.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753035AbYHKN3Z (ORCPT ); Mon, 11 Aug 2008 09:29:25 -0400 Message-ID: <48A03E28.9040801@novell.com> Date: Mon, 11 Aug 2008 09:27:04 -0400 From: Gregory Haskins User-Agent: Thunderbird 2.0.0.16 (X11/20080720) MIME-Version: 1.0 To: Ingo Molnar CC: Mike Galbraith , LKML , Peter Zijlstra Subject: Re: [revert] mysql+oltp regression References: <1218454322.25098.24.camel@marge.simson.net> <20080811114324.GA23529@elte.hu> <48A03049.202@novell.com> <20080811124857.GD10082@elte.hu> <48A038A6.4010104@novell.com> <20080811131400.GA909@elte.hu> <48A03C6E.60303@novell.com> In-Reply-To: <48A03C6E.60303@novell.com> X-Enigmail-Version: 0.95.6 OpenPGP: id=D8195319 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig75BA6372AA88FC8A39F1D9BB" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig75BA6372AA88FC8A39F1D9BB Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Gregory Haskins wrote: > Ingo Molnar wrote: >> * Gregory Haskins wrote: >> >> =20 >>>>> Speaking of this: Another patch I submitted to you Ingo (had to do = >>>>> with updating the load_weight inside task_setprio) seems to also=20 >>>>> have this phenomenon: e.g. its technically correct but further=20 >>>>> testing has revealed negative repercussions elsewhere. So please=20 >>>>> ignore that patch (or revert if you already pulled in, but I don't = >>>>> think you have). Ill try to look into this issue as well. >>>>> =20 >>>> ok, under which thread/subject is that? Not queued in tip/sched/*=20 >>>> yet, correct? >>>> =20 >>> Here is the original thread: >>> >>> http://lkml.org/lkml/2008/7/3/416 >>> >>> I do not believe you have queued it anywhere (public anyway) yet. >>> >>> Note I have already invalidated 1/2, and now I am retracting 2/2 as=20 >>> well. (1/2 is actually a bogus patch, 2/2 is "technically correct"=20 >>> but causes ripples in the load balancer that need to be sorted out=20 >>> first. >>> =20 >> >> ok, thanks. I'm curious, what are those ripple effects? Stability or=20 >> performance? >> =20 > > Performance. I found it while working on my pi series (which fyi I=20 > should have a v2 refresh for soon, probably today...i am hoping to get = > some review feedback from you on that as well, time permitting of=20 > course ;). > > Basically the behavior I was observing was that kernel builds via=20 > distcc would cluster all the cc1 jobs on a single core. At first I=20 > thought my pi-series was screwed up, but then I realized I had applied = > the patch referenced above earlier in my development tree, and=20 > removing it allowed pi to work fine. > > I found the problem with in once boot cycle with ftrace (thanks Steve!)= =2E Hmm..Im not sure what went wrong between brain and hand above, but of=20 course I meant to say ".. within one boot cycle ..", not "with in=20 once". Heh.=20 > Basically newidle balancing was always returning "no imbalance" even = > though I had 32 cc1 threads on 1 core, and 3 idle cores. Clearly not=20 > correct! So I think that by adjusting the load up, we throw off the=20 > hysteresis built into the load averages and cause the system to=20 > incorrectly think it's balanced. TBD. > > -Greg > > >> Ingo >> =20 > > --------------enig75BA6372AA88FC8A39F1D9BB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAkigPigACgkQlOSOBdgZUxnh1gCfTrK6reNZOoeCvbYsOq9ORGr4 WzEAnAsRQtsdzmleDFPHGpU5RSK6BXJd =JVp0 -----END PGP SIGNATURE----- --------------enig75BA6372AA88FC8A39F1D9BB--