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a977c40095
The last changes made the calibration loop 250ms long which is far too much. Try to do that more clever. Experiments have shown that using a 10ms delay for the PIT based calibration gives us a good enough value. If we have a reference (HPET/PMTIMER) and the result of the PIT and the reference is close enough, then we can break out of the calibration loop on a match right away and use the reference value. Otherwise we just loop 3 times and decide then, which value to take. One caveat is that for virtualized environments the PIT calibration often does not work at all and I found out that 10us is a bit too short as well for the reference to give a sane result. The solution here is to make the last loop longer when the first two PIT calibrations failed. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> |
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