Re: kern/36995 (ENHANCED_SPEEDSTEP dangerous on newer Core 2 Duo CPUs)

[jruoho%NetBSD.org@localhost]

Synopsis: ENHANCED_SPEEDSTEP dangerous on newer Core 2 Duo CPUs

State-Changed-From-To: open->closed
State-Changed-By: jruoho%NetBSD.org@localhost
State-Changed-When: Tue, 22 Mar 2011 09:59:14 +0000
State-Changed-Why:

I will close this; the issues with est(4) are unlikely to be fixed at this
point. Please reopen if you think otherwise.

> Proper fix: Unknown; is there a feature flag we can check when we
> calculate est frequencies to ignore the highest value?

There is no proper way to fix this within est(4). Note also that the MSR
values should not be set blindly on new Intel CPUs; besides the target MHz   
values, there are also certain enable/disable flags within the same register.