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    SubjectRe: [PATCH 0/6] cpufreq: Add sampling window to enhance ondemand governor power efficiency

    On Thu, Dec 23, 2010 at 12:34:02PM -0500, Dave Jones wrote:
    > On Thu, Dec 23, 2010 at 12:00:20PM +0100, Dominik Brodowski wrote:
    > > Interesting approach, but seems to be quite different from what "ondemand"
    > > does at the moment. And, as David Niemi pointed out, it seems to be more
    > > Intel-specific. Therefore, what do you think about adding this different
    > > algorithm as a different governor, and keep the "ondemand" algorithm more or
    > > less as it is?
    > I'm hesitant to merge more governors. (We already have too many imo).

    AFAICS, we do have two in-kernel dynamic frequency scaling governors, one of
    which doesn't seem to get much usage (conservative)...

    > The userspace logic for automatically deciding which is the best one to use is
    > already pretty hairy, so any additional ones at this point would have to be
    > accompanied with some really compelling reasons why the existing ones can't
    > be fixed in an acceptable manner.

    Well, if the underlying alogrithm is fundamentally different -- such as when
    looking at sampling windows instead of the past one window -- this seems to
    be a "compelling" reason to me. Especially if one governor works well on
    certain platforms, and the other one works better on other platforms.


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