Have you used cpu pinning? Do you attach a screen to your "NAS" box or you connect remotely? If using remote connection, what is it, VNC, Spice or some other? Did you enable HugePages? How much memory the VM had allocated? <div class="gmail_quote">On Sep 6, 2015 12:50 PM, "Jon Panozzo" <<a href="mailto:jonp@lime-technology.com">jonp@lime-technology.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello vfio users! A common question folks seem to have is what sort of performance they can expect out of a VM for gaming as compared to that of a physical machine. My company makes a linux-based OS that features the capabilities of a NAS and a virtualization host using KVM, which has been tuned for maximum compatibility with vfio GPU assignment. In a recent blog post, I've shown benchmark testing results in comparing a physical machine to a virtual one using the same hardware and with varying VM configurations. I even put together a video clip showing a side by side comparison of the benchmarks as they ran in real time, allowing you to visually see the difference in each test. Thought this might be of interest to some of you, do here's the link: <a href="http://lime-technology.com/gaming-on-a-nas-you-better-believe-it/" target="_blank">http://lime-technology.com/gaming-on-a-nas-you-better-believe-it/</a> Tl;Dr: I achieved up to 98% of bare metal. Regards, Jonathan Panozzo Lime Technology, Inc. _______________________________________________ vfio-users mailing list <a href="mailto:vfio-users@redhat.com">vfio-users@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/vfio-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a> </blockquote></div>