[vfio-users] posted interrupts

[Joshua Lee]

I'm not clear if posted interrupts, a feature of Broadwell-EP, is available
on both E5 1xxx V4 and E5 2xxx V4, or just E5 2xxx V4? Intel's marketing
literature seems to stress the latter family of processors as having it,
but reviews on sources such as Anandtech do not mention anything but
Broadwell-EP E5 Xeons having it in general.

Also, a second question, what amount of performance increase in GPU
performance could one expect for a KVM/QEMU virtual machine with PCIE VGA
passthrough using the posted interrupt feature of Broadwell-EP Xeons, using
say a 1620 V4, 1630 V4, or 1650 V4, assuming those have the feature (if
not, insert a frequency-optimized E5 2xxx instead) versus say a i7-5820k?
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