http://bugzilla.kernel.org/show_bug.cgi?id=10658
------- Comment #69 from len.br...@intel.com 2009-02-25 14:46 -------
Martin, Matthew, Thomas,
Thank you for your tenacity.
I do now agree that it is worth the risk to try to deploy
this w/o DMI, for there will be other boxes like this one.
As Zhang-Rui poined out, I staged Matthew's latest patch
for 2.6.30. Martin, hopefully your old laptop
is still available to test and benefit from this patch?
The main things I wonder about right now are:
1. is polling really necessary?
The observation in comment #64 suggests that on this box
it should not be necessary. Notify(0x80) on the thermal zone
is a thermal zone status change, which is exactly we should need
to re-evaluate the temperature and compare to trip points.
Martin, it would be interesting to discover at what temperature
you start seeing these events.
2. observability
We should probably print something when we manufacture a _PSV
and we should occasionally print a warning when throttling is invoked.
It is a risk that we may over-throttle and impact performance
more than we need to. Note that this will behave differently
for the CPU_FREQ=y and n cases. In the former, we try to exhaust
the P-states before using T-states. In the later, we run at HFM
and use T-states from there.
3. default constants
_TZP in the ACPI spec is defined to have a minimum value of 30 seconds.
(and a maximum of 5 minutes). We are defaulting to poll every 10 sec.
and I wonder if that is it more often than necessary. _TSP is basically
a guess. I don't have any better suggestions, but we should probably
at least comment that these are guesses.
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