On Mon, Mar 9, 2015 at 10:44 AM, H. Peter Anvin wrote: > On 03/09/2015 09:44 AM, Linus Torvalds wrote: >> >> And remember: those zero-cost out-of-order branches turn quite >> expensive if they *ever* mispredict. Even a 5% mispredict rate is >> likely to mean "it's better to have a data dependency chain". >> >> So it could easily go either way. I'm not convinced the old code is bad at all. >> > > I'm inclined to side with Linus here. I'm hesitant to change this based > on pure speculation. > > To answer Andy's question: I do believe we need espfix for V86 mode as well. > I think we don't. Did I screw up my test? --Andy > -hpa > > -- Andy Lutomirski AMA Capital Management, LLC