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Re: Any users of EST_FREQ_USERWRITE and INTEL_ONDEMAND_CLOCKMOD?



On Tue, 22 Feb 2011, Jukka Ruohonen wrote:

On Tue, Feb 22, 2011 at 09:42:07AM -0500, Jared McNeill wrote:
Fallback to ODCM if neither acpicpu nor est are available, but don't
remove it. Why would you have to add things to cpu_info? If you think you
have to add extra things to cpuinfo you need to step back and rethink what
you're doing.

The user interfaces are not compatible.[1] ODCM is entirely different thing
compared to frequency scaling technologies. It saves no power whatsoever on
all three systems I have tested it on. (If I had a lab environment, a good
hypothesis to validate empirically would be that it actually might increase
the power consumption.) Consequently, in my opinion it should stay as a
logically distinctive feature (or preferably, removed).

- Jukka.

[1] Nor would it be possible to use it in a KPI doing frequency management.

As far as user interfaces not being compatible -- estd has no problem with it. As I said, the order of preference should be:

  - ACPI
  - native EST / powernow
  - ODCM




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