From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752060Ab1JIRik (ORCPT ); Sun, 9 Oct 2011 13:38:40 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:43879 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751850Ab1JIRij (ORCPT ); Sun, 9 Oct 2011 13:38:39 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.3-dev To: Robert Kubrick Cc: Mike Galbraith , linux-kernel@vger.kernel.org Subject: Re: 2.6.32 / RH 6.1 scheduler bloated In-Reply-To: Your message of "Sun, 09 Oct 2011 10:26:22 EDT." <8AF29618-6746-484D-B773-AED31FBA714D@gmail.com> From: Valdis.Kletnieks@vt.edu References: <35C27021-40FC-4127-BC82-9F86FA9D624A@gmail.com> <1318140213.6216.40.camel@marge.simson.net> <8AF29618-6746-484D-B773-AED31FBA714D@gmail.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1318181914_103142P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Sun, 09 Oct 2011 13:38:34 -0400 Message-ID: <109116.1318181914@turing-police.cc.vt.edu> X-Mirapoint-Received-SPF: 198.82.161.152 auth3.smtp.vt.edu Valdis.Kletnieks@vt.edu 2 pass X-Junkmail-Status: score=10/50, host=zidane.cc.vt.edu X-Junkmail-Signature-Raw: score=unknown, refid=str=0001.0A020208.4E91DC1D.0006,ss=1,fgs=0, ip=71.62.120.57, so=2010-07-22 22:03:31, dmn=2009-09-10 00:05:08, mode=single engine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1318181914_103142P Content-Type: text/plain; charset=us-ascii On Sun, 09 Oct 2011 10:26:22 EDT, Robert Kubrick said: > Will try this, but I have older kernel version running on the same > hardware, with the same boot parameters, and showing a more > reasonable 2us wakeup latency. Still high, but coming out of idle can > be slow as you say. > But 10us?? My first guess is that earlier kernels were dropping into a lower sleep state that only took 2us to wake up, but newer kernels go into a deeper sleep state that takes longer to wake up from... --==_Exmh_1318181914_103142P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFOkdwacC3lWbTT17ARAq72AKC06jA/UByAuFyA1bHHQB/gKQFK9wCg+Mlu PtqOPADCYnoCEr1c8TZwh28= =opaH -----END PGP SIGNATURE----- --==_Exmh_1318181914_103142P--