On 4/15/21 9:24 AM, Andy Lutomirski wrote: > In the patches, *as submitted*, if you trip the XFD #NM *once* and you > are the only thread on the system to do so, you will eat the cost of a > WRMSR on every subsequent context switch.
I think you're saying: If a thread trips XFD #NM *once*, every switch to and from *that* thread will incur the WRMSR cost. The first time I read this, I thought you were saying that all threads would incur a WRMSR cost on every context switch. If that's the case, I grossly misread the patches. :)
