From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752743Ab0JKBKE (ORCPT ); Sun, 10 Oct 2010 21:10:04 -0400 Received: from mail-qw0-f46.google.com ([209.85.216.46]:57553 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752637Ab0JKBKC (ORCPT ); Sun, 10 Oct 2010 21:10:02 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=NLx7+xxlZ5rOg9LtZJa8hj1cf/UVszWtbiWP1t7nsvTqDByIpewQvVrYSbrmY9uDaC MPBIHULND3TxbANgsCxdfTJ4QX7Q/zWEWaMWpSRmeWx2OgWpBEJM0kqYrAHEe1wr19PF qMBo9/bqqPc3Zp7cMGCsLUWzPHKMMbG536yFk= Date: Sun, 10 Oct 2010 21:09:56 -0400 From: tmhikaru@gmail.com To: linux-kernel@vger.kernel.org, Greg KH , Chase Douglas , Ingo Molnar , Peter Zijlstra Subject: Re: PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later Message-ID: <20101011010956.GA7334@roll> References: <20101001035321.GA2360@roll> <20101001094814.GA5029@roll> <20101003030254.GA4901@roll> <1286095268.2144.119.camel@laptop> <20101003121209.586f7b6b@schatten.dmk.lab> <1286107478.2144.177.camel@laptop> <20101003171823.GA19129@roll> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="a8Wt8u1KmwUX3Y2C" Content-Disposition: inline In-Reply-To: <20101003171823.GA19129@roll> User-Agent: Mutt/1.4.2.3i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --a8Wt8u1KmwUX3Y2C Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, Oct 03, 2010 at 01:18:23PM -0400, tm@ wrote: > I screwed up and sent this incorrectly to only Peter originally, resent to > everyone else too. >=20 > On Sun, Oct 03, 2010 at 02:04:38PM +0200, Peter Zijlstra wrote: > > On Sun, 2010-10-03 at 12:12 +0200, Florian Mickler wrote: > > > On Sun, 03 Oct 2010 10:41:08 +0200 > > > Peter Zijlstra wrote: > > > > > > > On Sat, 2010-10-02 at 23:02 -0400, tmhikaru@gmail.com wrote: > > > > > The load average statistic is indeed broken somehow, and I > > > > > did bisect it down to where the problem began, however there seems > > > > > to be no > > > > > performance problem related to it I can find. > > > > > > > > Chase, anything you can see broken with this stuff? > > > > > > Peter, do you think it would be worthwile to test a kernel with the > > > low load-averages in NOHZ=3Ddisable mode? The bisected commit claims = to > > > fix a NOHZ issue with the load average. So if the new figures are the > > > correct ones, they should be somehow similar to the figures before > > > with NOHZ? Or am I on the wrong track here? > > > > No, that makes sense, but there is of course the distinct possibility > > that the patch wrecked the !nohz path as well. So ideally you'd have to > > compare NOHZ=3Dn with this patch reverted and NOHZ=3Dy with this patch = in > > place. > > >=20 > That'd be easy for me to do if you want. given I use CONFIG_NO_HZ=3Dy > in my kernel .config, that's tested the 'patch already in place' path rig= ht? > I'll try setting up a kernel build with CONFIG_NO_HZ=3Dn if that's what y= ou > want me to test. I unfortunately am not entirely sure if that's what I ne= ed > to alter though, so please get back to me and let me know so I can test i= t. >=20 > Tim McGrath I haven't heard any feedback from anyone about this since I sent this message. Is there anything else I can do to help nail this problem, is it already solved, or ... what? What's going on? Tim McGrath --a8Wt8u1KmwUX3Y2C Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) iQEVAwUBTLJj5JEncCrqzVruAQLDXAf+K65TOVvV/erPJqfqZLjI5t+XKM/jizFd ex473WxKbZ0CMXwH55QeZtlnfr02BMazjph08foVnURvmkPtZyWeWgvvBeYasDJc 65qkF7e9j05FXco4Zrj5TJAr4gomejKyoPG2IRidSPehYjpBqweMkINlrQxGMELS J7m1mimO975asPA+fiWz+QmFUoomMng4XtUzJ8NNb5c/PMNdPCAtfaNWZOIcCZrn plAvUiIf6vpnO3Jn9oyK8EjzWvLwXwaS1sub1n4xUCoynF8cHh2eaZorwmRWAALD fYCs8wLpSK8jv8PViqxTobywPU2sMSF6eLdPHh4HPZOBpHg1HU68xA== =ekkj -----END PGP SIGNATURE----- --a8Wt8u1KmwUX3Y2C--