Vojtech Pavlik wrote:
On Sat, Nov 12, 2005 at 06:21:11PM +0100, Andi Kleen wrote:
On Saturday 12 November 2005 10:22, Vojtech Pavlik wrote:
Is there any advantage to using 64-bit HPET?
Yes - it can tolerate long delays between ticks, e.g. caused by noidletick /
debuggers / target probes / smm etc. At least the first case will be fairly
important soon.
A 32-bit 14 MHz HPET counter will overflow in approximately 5 minutes. I
don't think going 64-bit makes sense for noidletick, but for debuggers,
etc, it could make a good sense indeed.
It's read is even slower
Why? The read should be on cache line granuality and there shouldn't
be any difference in theory.
I'll try to measure this. Indeed, in theory there shouldn't be a
significant difference.
Doesn't this depend on the atomic nature of the 64-bit read? If it is really two 32-bit reads one
would need to do extra work to make sure the two parts belong together.
--
George Anzinger [email protected]
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
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