Jan Kiszka wrote:
Jan Kiszka wrote:

...
What about other time sources on x86? Which systems already have HPET
these days, and does this source not suffer from frequency scaling? I
once read that HPET is quite easy to program, is this true? IOW, would
it be worth considering to add this to the HAL?


There are actually only few registers:

http://www.intel.com/hardwaredesign/hpetspec_1.pdf

Even a replacement for the TSC is available ("Main Counter"), but I
guess that some effort will be required to replace all direct usages of
rdtsc in the current Xenomai code, right?
And unfortunately they aren't guaranteed to survive S3 sleep, which laptops spend a lot of time in (around 50% when doing coantrol at 100 Hz).

--
Anders

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