In cinebench, I get 480 and 105fps on metal and 470 and 88fps in the VM. So definitely a drop there, though I wonder why openGL more than the cpu test. I have to add that in the VM, the disk was solicited a lot. Also, I'm not using any CPU pinning or anything like that. Cheers, -- Guillaume On 27 Feb 2016 13:51, Okky Hendriansyah <okky@nostratech.com> wrote: > > On February 27, 2016 at 18:31:39, mario goebbels (me@tomservo.cc) wrote: >> >> It's possible it's the IO. I had similar issues with GTA V in a VM, where its large amounts of IO, due to the game's streaming geometry and textures against my iSCSI disk, got everything in a tizzy, altho it were freezes of a few seconds only. I solved it by using iothreads. >> >> As far as hugepages go, your kernel is recent enough for transparent hugepages, so you'll be using 2MB hugepages already. >> >> In regards to the CPU flags, ditch hv_vapic. You have a Haswell, with APICv, which has less overhead in KVM. >> >> -mg > > > Hi Mario, > > I think Alex had mentioned before in one of the past thread [1], that in case of GPU passthrough (or device assignment in general), transparent hugepages is not beneficial. Instead use traditional hugepages. > > [1] https://www.redhat.com/archives/vfio-users/2015-November/msg00085.html > > Best regards, > Okky Hendriansyah