Re: Dynamic configure max_cstate

Len Brown
2009-07-28T19:25:27Z

> Entering a deep C state can cause strange things to timers: some of
> them, especially tsc, become unreliable.

The Nehalem family CPU has a non-stop constant-frequency TSC.

The measurements that Yanmin quotes show that the TSC
is the lowest overhead timesource in the system.

thanks,
Len Brown, Intel Open Source Technology Center