On Wed, Jun 28, 2017 at 2:53 PM, Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> wrote: > > > On 6/29/17 00:26, Steven Walter wrote: >>> >>> So, I'm trying to reproduce this issue on the Ryzen system w/ the >>> following >>> setup: >>> >>> * Host kernel v4.11 (with this patch >>> https://lkml.org/lkml/2017/6/23/295) >>> >>> * guest VM RHEL7.3 >>> >>> * guest graphic driver = radeon >>> >>> * qemu-system-x86_64 --version >>> QEMU emulator version 2.9.50 (v2.9.0-1659-g577caa2-dirty) >>> >>> * kvm-amd npt=1 >>> >>> * dGPU is 08:00.0 VGA compatible controller: Advanced Micro Devices, >>> Inc. >>> [AMD/ATI] Tobago PRO [Radeon R7 360 / R9 360 OEM] (rev 81) >>> >>> * qemu-system-x86_64 -smp 4 -enable-kvm -M q35 -m 4096 -cpu host -bios >>> /usr/share/qemu/bios.bin -device >>> ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 >>> -drive file=/sandbox/vm-images/rhel7.3.qcow2,if=virtio,id=disk0 -net none >>> -vga none -nodefaults -device >>> >>> vfio-pci,host=08:00.0,x-vga=on,addr=0.0,multifunction=on,bus=root.1,romfile=/sandbox/vm-images/vbios.rom >>> -usb -device usb-host,hostbus=3,hostport=1 -device >>> usb-host,hostbus=3,hostport=3 -device vfio-pci,host=0000:08:00.1 -device >>> vfio-pci,host=0000:09:00.0 >>> >>> With this setup, I am able to pass-through the dGPU and run the following >>> test: >>> * Starting up the guest w/ full GNOME GUI on the attached monitor. >>> * glxgears (running @ 60 FPS) >>> * Playing 1080p HD video on Youtube >>> >>> I am not noticing issues here. What kind of test are you running in the >>> guest VM? >> >> Try running the open source game "torcs" inside the VM. I think >> you'll find that there's a very noticeable performance different >> between npt=1 and npt=0 > > > Hm.. actually torcs seems to be running fine w/ npt=1 setup. Although I > think my driving skill is ~20% worse :( > > S Hi Suravee, Did you get a chance to test this again with a more graphically intense program such as the Unigine Heaven benchmark? This is still a massive issue in the community. Thanks, Sarnex
