On Thu, Apr 06, 2017 at 10:31:46AM -0700, Linus Torvalds wrote: > But maybe "monitor" is really cheap. I suspect it's microcoded, > though, which implies "no". On my IVB-EP (will also try on something newer): MONITOR ~332 cycles MWAIT ~224 cycles (C0, explicitly invalidated MONITOR) So yes, expensive.
