On February 20, 2017 2:02:53 PM PST, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > >> > 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 Oh, I would say it is... especially when it's basically free. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
