Symptoms or Error

Customers running XenServer 6.2 with GPU pass-through, or NVIDIA GRID GPU visualization (vGPU) may notice that when running Microsoft Internet Explorer within a VM, it does not make use of hardware GPU acceleration, for example, for HTML5 applications. Other applications within the virtual machine are able to use the GPU without any issues

Solution

Citrix and Microsoft have worked together to diagnose the causes of this issue and have determined that the hardware definition represented to Internet Explorer in XenServer 6.5 is correct. Customers who wish to take advantage of hardware GPU acceleration for Internet Explorer should therefore upgrade to XenServer 6.5 when possible.

Problem Cause

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Internet Explorer disables GPU hardware acceleration and falls back to software rendering when it detects that it is running “in a remote desktop session” (see How to enable or disable software rendering in Internet Explorer). In XenServer 6.2, the hardware flags provided to VMs do not include all the necessary parameters for Internet Explorer to determine that hardware GPU acceleration is available even if a hardware GPU is present. Specifically, Internet Explorer must be able to detect the presence of Second Level Address Translation (SLAT) which while supported by XenServer 6.2, is not flagged to virtual machines in the way expected.

Additional Resources

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Microsoft KB 2528233 - How to Enable or Disable Software Rendering in Internet Explorer