Re: RFC: Getting rid of LTR in VMX

[Paolo Bonzini]

> > Yes.  But 150-200 clock cycles are nothing compared to the cache misses
> > you get from preemption, so I'd ignore that.  Saving 300 clock cycles on
> > userspace exits from TR+GSBASE would be about 5% on my Haswell.
> 
> That's still 5% :)

Yes, 5% on userspace exits is good (though they're rare).

OTOH, 300 clock cycles on preemption are nothing to write home about.

Paolo