[Xen-devel] ac_timer accuracy

[kuas <ku4s@xxxxxxxxxxxxxxxxxxxxx>]

Hello,

I am trying to schedule some task within Xen. I am trying to find out
the smallest period that can be scheduled using ac_timer. I haven't been
able to understand it. I believe the timing are done in ns. The smallest
period that I can see the timer expired is around 1400 ns. But I have
never been able to actually schedule it to expired that short. There is
a variable TIMER_SLOP which is in 50000 ns. Is this the smallest timer
value that can be set in the timer?

I wonder if any other Xen developer has ever tried using this and know
the behavior. Is there any other way I can get a small and accurate
timer in Xen environment? Thanks in advance.

kuas



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