Re: Performance overhead of get_cycles_sync

[Ingo Molnar]

* Andi Kleen <ak@xxxxxxx> wrote:

> Ingo Molnar <mingo-X9Un+BFzKDI@xxxxxxxxxxxxxxxx> writes:
> 
> > the TSC clocksource (and hence the vsyscall code) is turned off on 
> > systems that fail the TOD/CLOCK portion of this test:
> 
> Which is not on core2 which was the question about. And if it was 
> turned off it wouldn't use get_cycles_sync() at all.

it is turned off on core2 too:

 # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
 acpi_pm

	Ingo
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