Messages in this thread | | | Date | Mon, 20 Feb 2017 17:02:53 -0500 (EST) | From | Paolo Bonzini <> | Subject | Re: RFC: Getting rid of LTR in VMX |
| |
> > 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
| |