Re: TSC calibration sometimes not correct with RT patch.

[Ingo Molnar]

* Henri Hunnekens <henrihunnekens@xxxxxxxxx> wrote:

> I've seen that the calbration of the TSC timer was not always done 
> correctly, which resulted in incorrect timers.
> 
> I found out that local_irq_disable is used before the calibration is 
> started. However with the RT patch applied this does not mean that the 
> interrupts are disabled and therefore the calibration may fails when 
> it's interrupted by an interrupt. Correct me if I'm wrong.

local_irq_disable() still disables interrupts, even in PREEMPT_RT. So 
the problem should be elsewhere. Can you see similar problems on .22-rt 
too? The hrt code saw a number of updates there.

	Ingo
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