Hi, my host system is linux-4.4.0 with qemu-2.5.0 and a 4-core i7. Linux is booted with isolcpus=1-3,5-7 to reserve 3 cores + threads for the Windows 10 VM. The VM's 3 cores(2 threads each) are pinned to the respective physical core/thread. The iothread is pinned to 1-3,5-7.
When i start a simple "openssl speed" in the VM and use the task manager to pin it to a single cpu, it work's just the way I expect it to work: 1 cpu has 100% usage, visible in both guest's task manager and host's top. But when I start a game, for instance Diablo 3 or CoD Black Ops III, and also use the task manager to pin it to a single cpu, the cpu usage shown in guest's task manager differs from the one shown in host's top: the guest shows 1 cpu with 100% usage, as expected, but the host shows all 6 cpus with 100% usage. It only happens with games. If you use other multi-threaded programs without 3D, for instance prime95, the cpu usage in guest's task manager is equal to the one in top. I can only assume vfio is somehow causing this additional cpu usage, but a it seems to be.... to much. Did someone else experience this or can enlighten me on what qemu/vfio is doing with additional cpu time? Regards, Friedrich _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
