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Date: Wed, 18 Aug 2004 15:22:09 +0300
From: Maxim Sobolev <sobomax@portaone.com>
Organization: Porta Software Ltd
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To: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au>
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cc: Colin Percival <colin.percival@wadham.ox.ac.uk>
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Subject: Re: Enhanced SpeedStep driver available
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Wilkinson, Alex wrote:

> 	0n Tue, Aug 17, 2004 at 04:57:24PM +0300, Maxim Sobolev wrote: 
> 	
> 	Well, TCC is not that different from ESS. The only difference is that it 
> 	operates with percentages, not with absolute frequences and that there 
> 	are fewer steps available. Therefore, it should be fairly easy to add 
> 	support for TCC as well.
> 
> Trying to follow this thread. Can you please elaborate on the acronyms: 
> TCC and ESS.

TCC == Thermal Control Circuit, special circuit found in p4 CPUs, which 
allows to control processor trottling, effectively controlling power 
consumption and performance. Usually is controlled automatically to 
prevent CPU overheating, but it is possible to control it from software.

ESS == Enhanced Speed Step, special technology in Centrino CPUs, which 
allows to control frequency at which CPU runs again to control power 
consumption and performance.

-Maxim