Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit_calibrate()

[Andi Kleen]

On Tue, Jun 02, 2015 at 11:03:26PM +0200, Thomas Gleixner wrote:
> 
> 
> On Tue, 2 Jun 2015, Andi Kleen wrote:
> 
> > > There's the code in tsc_msr.c.  It should be relatively
> > > straightforward to extend it to cover everything that intel_pstate
> > > supports.
> > 
> > That's a good idea, but we still need an always working fallback when the
> > model number is not available. So Adrian's patch is needed in any
> > case.
>  
> Nonsense. The slow calibration is already a working fallback.

Please read Adrian's description again. It's not working when the PIT read is
too slow. That is when the new algorithm is needed.

-Andi
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