RE: why kernel implement "udelay" by cpu instructions?

From: Rajat Jain
Date: Wed Nov 04 2009 - 00:47:35 EST


> I thought hrtimers allow higher-precision wakeups these days?
> Of course, if you only want to sleep for a few microseconds, the
> context switch might take longer than you want to sleep...

Yes, that is right. Sorry, I missed that. But that is purely HW
dependent - if your HW providea a high precision timer (Such as HPET on
latest Intel machines), that can be used for quicker sleeps.


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