linux-kernel - Re: cpufreq affects traffic control rates

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Message-ID: <Pine.LNX.4.64.0708291725000.24730@fbirervta.pbzchgretzou.qr>
Date:	Wed, 29 Aug 2007 17:26:24 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
cc:	DervishD <lkml@...vishd.net>,
	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: cpufreq affects traffic control rates


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
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