Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756842AbXH2P0d (ORCPT ); Wed, 29 Aug 2007 11:26:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753529AbXH2P00 (ORCPT ); Wed, 29 Aug 2007 11:26:26 -0400 Received: from sovereign.computergmbh.de ([85.214.69.204]:43396 "EHLO sovereign.computergmbh.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752060AbXH2P0Z (ORCPT ); Wed, 29 Aug 2007 11:26:25 -0400 Date: Wed, 29 Aug 2007 17:26:24 +0200 (CEST) From: Jan Engelhardt To: Stephen Hemminger cc: DervishD , Linux-kernel Subject: Re: cpufreq affects traffic control rates In-Reply-To: <20070828152309.7fe1ce91@freepuppy.rosehill.hemminger.net> Message-ID: References: <20070828075155.GG17475@DervishD> <20070828152309.7fe1ce91@freepuppy.rosehill.hemminger.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 928 Lines: 24 On Aug 28 2007 15:23, Stephen Hemminger wrote: >> I noticed lately that my traffic control rates were being very slow, >> about 40% less than expected, and finally spotted the problem: cpufreq. >> >> Looks like HTB puts buckets according to the requested rate but >> assuming that the CPU is running at its default clock or something like >> that. >> >Is the problem configuration of network scheduler clock? In 2.6.20 and earlier, you >could use CPU cycle counter (later kernels only use time of day). So try >switching to jiffies or gettimeofday. This should not have been removed. CPUs with constant_tsc could still be used with "CPU cycle counter" method. Jan -- - 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/