I've implemented PVEOI a FreeBSD guest. And it works amazingly well
at reducing VM exits/entrys. On a E5-2640 Dell r720s with 1333MHz
anyway. I've a pair of E5-2630 (turbo disabled) r720s with 1600 MHz
DIMMs which PVEOI has zero effect. BIOS settings, BIOS version, RHEL7,
qemu and VM guests are all identical. Staring at the PVEOI
implementation in the host shows nothing obvious at to why PVEOI does
not just work. Is there anything anyone can think of which might cause
this behavior or lack thereof? Is it just the faster memory or the
microarchitecture (Sandy versus Ivy) and/or feature differences: the
2630 includes <f16c rdrand fsgsbase smep erms>. Any hints would be
appreciated.
Bret
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