4 ms·

I don't have any specific info, but I would be very surprised if this MSR setting wasn't on a per-core basis. So only cores that are currently running code that

I don't have any specific info, but I would be very surprised if this MSR setting wasn't on a per-core basis. So only cores that are currently running code that requires x86-TSO would be running in that mode.

saagarjha 6y ago
Per core, yes. It gets set on entry and exit from the kernel for threads that have been marked as needing it.