Subject: Re: How is user space notified of CPU speed changes?
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: jonathan@jonmasters.org
Cc: Lee Revell <rlrevell@joe-job.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Robert Love <rml@novell.com>
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On Sul, 2004-10-24 at 00:35, Jon Masters wrote:
> Out of sheer interest, you said you had an example box which did this.
> I've never actually seen a modern SMP setup with different cock
> frequencies (even accepting it's possible) - can you give me a more
> modern example? I'm sure they're out there, I've just missed it, and I
> have to confess to not being aware that Linux supported this kind of
> setup.

The classic setups were dual PIII type systems - common FSB clock but
different multipliers for the processors. A lot of dual slot 1 boards
ended up with weird processor combinations.

Modern systems that don't tie the tsc include the big IBM 440 series
systems.

Alan

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