Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751824Ab0KNFOQ (ORCPT ); Sun, 14 Nov 2010 00:14:16 -0500 Received: from mail-qw0-f46.google.com ([209.85.216.46]:36417 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750708Ab0KNFON (ORCPT ); Sun, 14 Nov 2010 00:14:13 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=FgRwKe2SfGxk1on8Th8zysZwGTKMGI3aWky6a8EvFZ5owyx7BGVT/ak4vogsZUNj4r udmCiw3zdLuk+ozzvYqpyTLbTfmXWfHgAcihmLFKEI+YZ6NDt+YXb4dB2VEiyFj0NHxs po/qT6j62NO5P2saJNJzTNOigXi0F0ZXXHKsI= Date: Sun, 14 Nov 2010 00:14:07 -0500 From: tmhikaru@gmail.com To: Peter Zijlstra Cc: Venkatesh Pallipadi , Damien Wyart , Chase Douglas , Ingo Molnar , tmhikaru@gmail.com, Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later) Message-ID: <20101114051406.GA2050@roll> References: <1287788622-25860-1-git-send-email-venki@google.com> <1288001573.15336.52.camel@twins> <1288097074.15336.211.camel@twins> <1288101958.15336.284.camel@twins> <1288381343.1988.12.camel@laptop> <20101109185516.GQ8332@bombadil.infradead.org> <1289329348.2191.69.camel@laptop> <20101110034507.GV8332@bombadil.infradead.org> <1289390424.2191.98.camel@laptop> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="cNdxnHkX5QqsyA0e" Content-Disposition: inline In-Reply-To: <1289390424.2191.98.camel@laptop> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2735 Lines: 68 --cNdxnHkX5QqsyA0e Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Nov 10, 2010 at 01:00:24PM +0100, Peter Zijlstra wrote: > On Tue, 2010-11-09 at 22:45 -0500, Kyle McMartin wrote: > > On Tue, Nov 09, 2010 at 08:02:28PM +0100, Peter Zijlstra wrote: > > > Right, I tested it myself yesterday and got similar results. Does the > > > 'simple' patch from a few posts back work for people? > > > > >=20 > > Apparently it doesn't make a large amount of difference. :/ >=20 > Crud, ok, back to basics it is.. thanks for testing! Much like the other tester, this doesn't make any difference at all for me, load fluctuates semi randomly as it did before with an average after 20 mins of around 0.8 with the machine idle. I have to wonder, is there currently a reason NOT to revert this commit? Does this commit that's causing problems for myself and other people actually fix problems for some people that existed before? I just want to know why there seems to be a struggle to fix the current implementation rather than backing out the change that caused the problem I'm dealing with and then trying to work from there. If you've forgotten, I'm talking specifically about this commit: [74f5187ac873042f502227701ed1727e7c5fbfa9] sched: Cure load average vs NO_H= Z woes We've gone through two kernel releases with this commit, and I think I'm understandably curious why it's not been reverted if it's causing problems with no solution in sight. Note that I'm currently running 2.6.35.8 with CONFIG_NO_HZ unset with no problems with the load average, so at least that works properly, and proves that I'm not being affected by some other quirk at least... Machine's only been up ten minutes or so, but here's the uptime data anyway for the curious: 00:10:02 up 12 min, 4 users, load average: 0.00, 0.11, 0.14 Tim McGrath --cNdxnHkX5QqsyA0e Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEVAwUBTN9wHpEncCrqzVruAQKlqAf+KzXtWCLKKuoDFm19V/ZXylExc44Gny8A hpZ4vHjIss+fbWkv97XdiYrxRbsGCPfUC9ngWJzcymNn93Z9bhDP1O8ROgFze3Lb 1TQ2B1xiasPh2Bq+0jtkQSyjlp60wyTFsb/eWwSq+qlcs1Jfo4Uzhb3FuvVPR/BT tevi3oxF1CSVKHXAZ8Dn+kmSJDV62/3cYlFHizaKiD5WoTqcyrzs/aspVEcoWJYw OkFxNKY2T7scHKJqXcno04Jcave7V9+TwxsZX8w8qWWwH1d7mCmeg4SAPv69yBOg lAS/Iyf5btR+0j8pKA7oqTZTf+Yh/wIiihHAGI24MMQlRPsgVG8Ykw== =Lqe7 -----END PGP SIGNATURE----- --cNdxnHkX5QqsyA0e-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/