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Re: [vfio-users] Hyper-v enlightments on recent NVIDIA drivers?





2015-12-05 19:02 GMT+08:00 Ruben Torrero Marijnissen <ruben torrero gmail com>:
Hi,

I installed last week a Windows 10 guest on my flaming new Skylake
build, on top of my Arch Linux install. After doing some reading, I
understood I had to disable any Hyper-V enlightment and make KVM run in
'hidden' mode, so my Nvidia drivers wouldn't shut down.

However, just for the curiosity, I googled for a while and found the
last version that didn't check for KVM presence and tested the
different performance with and without Hyper-V enlightments: Oddly,
Unigine benchmark doesn't show almost *any* performance gain, but with
several games, the difference can be as big as 50% in heavily loaded
scenarios. My guess on this games that rely more on the GPU won't see
much improvements, but games that also use I/O and CPU extensively will
see a big improvement. Any idea what other reasons there could be?

IME, if you didn't add any signs in -cpu tag, or if you deleted any Hvper-V signs in VM XML file, it will disabled Hyper-V functions.

And, there are many games will got unstable performance without Hyper-V, especially online games and games that use a lot of mappings.
I got huge performance differences on 3DMark tests. With Hyper-V, I can got about 103xx, BUT i got only 95xx when I disabled Hyper-V.

If Hyper-V checker has removed since newest driver, it's a good news, but still need to test it.
Also, some graphic cards only can use previous driver, especially using in old OS.  
 
I also read in a forum (https://lime-technology.com/forum/index.php?top
ic=43824.0
) that Alex Williamson is working on a QEMU patch to allow
Windows guests to use Hyper-V enlightments without Nvidia beeing able
to detect is. Is this true?. Where could I follow the development /
test it?

You can get that patch by downloading QEMU with git version. 

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