Anders Blomdell wrote: > 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). >
Great. Someone should go out and choke a few hardware developers again for being that short-sighted. So the PM timer is the most robust one, just a bit slow. Jan
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