Hi,
There are a lot of messages/threads out there about bad performance
while using AMDs Ryzen with KVM GPU passthrough. It revolves all on
enabling/disabling npt, while enabled overall VM performance is nice but
the GPU performance gives me about 20% (and a lot of drops to zero GPU
usage, while CPU/Disk/Ram also doing nothing) compared to npt disabled.
But while npt is disabled overall VM performance is like beeing on 4x86
with floppy disk as only storage. (Ex. it takes 2 seconds just to open
startmenu while host and vm are in idle, and neither CPU pinning,
changing CPU model, changing storage device nor using hugepages changed
anything).
So everything I read pointed to a bug in the npt implementation?
Anything I could do to get closer to the "thing" issuing this?
Best Regards
efeu
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