Date: Tue, 09 Nov 2010 14:17:11 +0100 From: "Svein Skogen (Listmail account)" <svein-listmail@stillbilde.net> To: freebsd-questions@freebsd.org Subject: Re: Per core frequency control Message-ID: <4CD949D7.6030003@stillbilde.net> In-Reply-To: <201011091256.51140.naylor.b.david@gmail.com> References: <201011091256.51140.naylor.b.david@gmail.com>
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On 09.11.2010 11:56, David Naylor wrote:
> Hi,
>
> I was reading through cpufreq(4) and in the bugs section it mentions that per
> core (or CPU) frequency control is not supported. That all cores/CPUs have to
> be at the same speed.
>
> What is the reason for that?
>
> Is it an infrastructure problem with FreeBSD or has it just not been
> implemented?
>
> And how will the recent work on event timers (and a "tickless" kernel) impact
> on this problem?
You did read the "symmetric" part of "symmetric multi processor" didn't you?
It's a limitation of the technology. One clock.
//Svein
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