linux-kernel - Re: cpufreq affects traffic control rates

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Message-ID: <20070829075936.GD18688@DervishD>
Date:	Wed, 29 Aug 2007 09:59:36 +0200
From:	DervishD <lkml@...vishd.net>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: cpufreq affects traffic control rates

    Hi Stephen :)

 * Stephen Hemminger <shemminger@...ux-foundation.org> dixit:
> On Tue, 28 Aug 2007 09:51:55 +0200 DervishD <lkml@...vishd.net>
> wrote:
> >     I noticed lately that my traffic control rates were being very
> >     slow, about 40% less than expected, and finally spotted the
> >     problem: cpufreq.
> 
> 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.

    Yes, the problem is that I'm stupid and I thought I was using
jiffies, but I have CONFIG_NET_SCH_CLK_CPU. I'll rebuild my kernel ASAP
and set the proper value...

    Thanks for your help. It's embarrassing I didn't check the clock
source for the packet scheduler...

    Sorry for the noise.

    Raúl Núñez de Arenas Coronado

-- 
Linux Registered User 88736 | http://www.dervishd.net
It's my PC and I'll cry if I want to... RAmen!
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