XenServer6.2 ) GPU Memory Mapping Issue

How to Resolve GPU Memory Mapping Issues in XenServer
http://support.citrix.com/article/CTX139834
Dom0で

Unix.Unix_error(20, "open", "/sys/bus/pci/drivers/nvidia/bind")

とか出るときは、
BIOSで

Change Memory Mapped I/O above 4GB to Disabled.

しよう。

参考） XenServer Forum
Every 4th guest fails with error 'vgpu exited unexpectedly'
http://discussions.citrix.com/topic/351335-every-4th-guest-fails-with-error-vgpu-exited-unexpectedly/