> On Apr 15, 2021, at 10:00 AM, Dave Hansen <dave.han...@intel.com> wrote: > > 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.
Indeed. My sentence was missing a few words at the end. > > 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. :)
