Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751317AbVLECDY (ORCPT ); Sun, 4 Dec 2005 21:03:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751340AbVLECDY (ORCPT ); Sun, 4 Dec 2005 21:03:24 -0500 Received: from mail28.syd.optusnet.com.au ([211.29.133.169]:21889 "EHLO mail28.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S1751317AbVLECDX (ORCPT ); Sun, 4 Dec 2005 21:03:23 -0500 From: Con Kolivas To: Dominik Brodowski Subject: Re: fix cpufreq-ondemand by accounting skipped ticks as idle ticks [Was: [PATCH] i386 no idle HZ aka Dynticks 051203] Date: Mon, 5 Dec 2005 13:02:57 +1100 User-Agent: KMail/1.9 Cc: linux kernel mailing list , ck list , Tony Lindgren , Adam Belay , Daniel Petrini , vatsa@in.ibm.com References: <200512041737.07996.kernel@kolivas.org> <20051204122434.GB9503@dominikbrodowski.de> In-Reply-To: <20051204122434.GB9503@dominikbrodowski.de> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200512051302.58583.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 879 Lines: 19 On Sunday 04 December 2005 23:24, Dominik Brodowski wrote: > Account ticks skipped dynamically as idle ticks. > > This allows the ondemand cpufreq governor to work correctly with dyntick. Dominik one thing I noticed a while back was that ondemand also polls at a frequency that creates a timer at around 140 HZ. Tweaking the ondemand/ tunables and making it poll ten times less frequently made a big difference to this (obviously) but did obviously slow down the scaling speed - this was the frequency required to bring it to that of the background timers (<=20HZ). I see scope for this polling to be dynamic too :D Cheers, Con - 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/