Jan Kiszka wrote:
> Sebastian Smolorz wrote:
>> Jan Kiszka wrote:
>>> This patch may do the trick: it uses the inverted tsc-to-ns function
>>> instead of the frequency-based one. Be warned, it is totally untested
>>> inside Xenomai, I just ran it in a user space test program. But it
>>> may give an idea.
>> Your patch needed two minor corrections (ns instead of ts in functions
>> xnarch_ns_to_tsc()) in order to compile. A short run (30 minutes) of
>> latency -t1 seems to prove your bug-fix: There seems to be no drift.
> That's good to hear.
>> If I got your patch correctly, it doesn't make xnarch_tsc_to_ns more
>> precise but introduces a new function xnarch_ns_to_tsc() which is also
>> less precise than the generic xnarch_ns_to_tsc(), right?
> Yes. It is now precisely the inverse imprecision, so to say. :)
>> So isn't there still the danger of getting wrong values when calling
>> xnarch_tsc_to_ns() not in combination with xnarch_ns_to_tsc()?
> Only if the user decides to implement his own conversion. Xenomai with
> all its skins and both in kernel and user space should always run
> through the xnarch_* path.
OK, would you commit the patch?
Xenomai-core mailing list