PCI pass through is the ability of a virtualized guest system to directly access PCI hardware. Pass through for dedicated GPUs has just recently been added to the Linux kernel-based virtual machine. Soon afterward, users began to find that switching on nested page tables (NPT), a technology intended to provide hardware acceleration for virtual machines, had the opposite effect on AMD platforms and slowed frame rate down to a crawl.
Annoyed by this [gnif] set out to to fix the problem. His first step was to run graphics benchmarks to isolate the source of the problem. Having identified the culprit …read more http://pje.fyi/PyXG6D