David Airlie and others at Red Hat have been investing a lot into Virgil 3D and with Fedora 24 all of the pieces are falling into place for easily making use of the feature. If you are unfamiliar with Virgil 3D from our past articles on the matter, visit the project site.
Phoronix reader and forum member Dagger has done some of his own tests using Virgil 3D and comparing the results on the same system to the host. Tests were done with Fedora 24 Beta. Details can be found via this thread for Phoronix Premium members.
He did his OpenGL benchmarking on the host and from the QEMU VM via the Phoronix Test Suite, of course, and uploaded the data to OpenBenchmarking.org.
You can find his initial data via this OpenBenchmarking.org result file. The system table does indicate some differences in the software configuration, but nevertheless the results are wildly different:
There's certainly a lot of overhead to Virgil or other areas to make improvements to with its kernel driver and Gallium3D code.
Some of the results though aren't quite as bad... Then again, there isn't any guest driver yet for Microsoft Windows, so there wouldn't be too much point of using Virgil with your Linux client for gaming when you could just run the game on your Linux host. But at least Virgil is good enough for handling modern Linux desktops!
Continue on at OpenBenchmarking.org to look at this preliminary independent data. It's still on my TODO list to try out Virgil 3D on Fedora 24 and compare the performance with different graphics drivers to that of VMware / VirtualBox using their 3D guest driver implementations. Thanks to Dagger for sharing these early results from his system!