[vfio-users] cpu core pinning with multiple cpus

[Alex Williamson]

On Tue, Sep 22, 2015 at 6:48 AM, Erik Adler <erik.adler at gmail.com> wrote:

> Said I would get back with some more info. For w/e reason it is just
> that one game "Tera" that has crazy bad fps. Bare metal I could have
> 80 fps. Tera could drop down to about 4 fps in . Newer games like
> Witcher 3, GTA V etc all work really really well.  This was a clean
> install of Windows 10, GTX 970. dmesg looked normal but if you want I
> can post it.


Ok, since Tera is free to play, I spent some time on this and unfortunately
I think our friends at Nvidia are to blame.  I tried the game on a Quadro
VM with lesser hardware than your GTX970 and I can hit about 80fps looking
at the ground or sky, looking out across the newbie training area this
drops into the 40s.  Then I shutdown the VM, disabled the hyper-v
extensions, specifically hv_time, and tried again.  The frame rate is more
or less cut in half and graphics settings barely seem to make a
difference.  My guess is that since this is a multiplayer network game,
it's really hammering on the time source for all the network packets and
using a paravirt time source makes a massive difference.
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