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From: Adam James <ad@heliosphan.co.uk>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] cpufreq affects rate in, at least, htb
Date: Tue, 28 Aug 2007 22:19:36 +0000	[thread overview]
Message-ID: <20070828231936.22b9683a@localhost> (raw)
In-Reply-To: <20070828074738.GF17475@DervishD>

On Tue, 28 Aug 2007 09:47:38 +0200
DervishD <lartc@dervishd.net> wrote:

>     I've tested this and having a cpufreq that slows down the CPU
> affects the rate of HTB. My ondemand cpufreq governor scales down the
> CPU frequency about 40% and this is more or less the slowdown the rate
> suffers, 40%.

This is expected behaviour when CONFIG_NET_SCH_CLK_CPU is defined:

	Say Y here if you want to use the CPU's cycle counter as clock
	source.

	This is a cheap and high resolution clock source, but on some
	architectures it is not synchronized on all processors
	and doesn't handle cpu clock frequency changes.

>     Any known way of dealing with this without having to disable
> cpufreq?

Yes, specify a different clock source in your kernel configuration.

--atj


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  parent reply	other threads:[~2007-08-28 22:19 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-28  7:47 [LARTC] cpufreq affects rate in, at least, htb DervishD
2007-08-28 10:24 ` Andreas Mueller
2007-08-28 15:03 ` DervishD
2007-08-28 22:19 ` Adam James [this message]
2007-08-29  7:57 ` DervishD

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