• Performance Tuning for Remote Desktop Virtualization Host
  • RemoteFX Server System Memory
  • RemoteFX Server GPU Video Memory
  • RemoteFX GPU Processing Power
  • RemoteFX Root GPU Management
  • RemoteFX VGPU Management
  • RemoteFX Virtual Machine VGPU Performance
  • Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract




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    Windows System Resource Manager


    Windows System Resource Manager (WSRM) is an optional component that is available in Windows Server 2012. WSRM supports an “equal per session” built-in policy that keeps CPU usage equally distributed among all active sessions on the system. Although enabling WSRM adds some CPU usage overhead to the system, we recommend that you enable it because it helps limit the effect that high CPU usage in one session has on the other sessions on the system. This helps improve the user’s experience, and it also lets you run more users on the system because of a reduced need for a large cushion in CPU capacity to accommodate random CPU usage spikes.

    Performance Tuning for Remote Desktop Virtualization Host


    Remote Desktop Virtualization Host (RD Virtualization Host) is a role service that supports Virtual Desktop Infrastructure (VDI) scenarios and lets multiple concurrent users run Windows-based applications in virtual machines that are hosted on a server running Windows Server 2012 and Hyper-V.

    Windows Server 2012 supports two types of virtual desktops, personal virtual desktops and pooled virtual desktops.


    General Considerations

    Storage


    Storage is the most likely performance bottleneck, and it is important to size your storage to properly handle the I/O load that is generated by virtual machine state changes. If a pilot or simulation is not feasible, a good guideline is to provision one disk spindle for four active virtual machines. Use disk configurations that have good write performance (such as RAID 1 0).

    When appropriate, use SAN-based disk deduplication and caching to reduce the disk read load and to enable your storage solution to speed up performance by caching a significant portion of the image.


    Memory


    The server memory usage is driven by three main factors:

    • Operating system overhead

    • Hyper-V service overhead per virtual machine

    • Memory allocated to each virtual machine

    For a typical knowledge worker workload, guest virtual machines running Window 8 should be given 512 MB of memory as the baseline. However, dynamic Memory will likely increase the guest virtual machine’s memory to about 800 MB, depending on the workload.

    Therefore, it is important to provide enough server memory to satisfy the memory that is required by the expected number of guest virtual machines, plus allow a sufficient amount of memory for the server.  


    CPU


    When you plan server capacity for an RD Virtualization Host, the number of virtual machines per physical core will depend on the nature of the workload. As a starting point, it is reasonable to plan 12 virtual machines per physical core, and then run the appropriate scenarios to validate performance and density. Higher density may be achievable depending on the specifics of the workload.

    We recommend enabling hyperthreading, but be sure to calculate the oversubscription ratio based on the number of physical cores and not the number of logical processors. This ensures the expected level of performance on a per CPU basis.



    Note   It is critical to use virtual machines that have Second Level Address Translation (SLAT) support. Most servers running Windows Server 2012 will have SLAT.

    Virtual GPU


    Microsoft RemoteFX for RD Virtualization Host delivers a rich graphics experience for Virtual Desktop Infrastructure (VDI) through host-side remoting, a render-capture-encode pipeline, a highly efficient GPU-based encode, throttling based on client activity, and a DirectX-enabled virtual GPU. RemoteFX for RD Virtualization Host upgrades the virtual GPU from DirectX9 to DirectX11. It also improves the user experience by supporting more monitors at higher resolutions.

    The RemoteFX DirectX11 experience is available without a hardware GPU, through a software-emulated driver. Although this software GPU provides a good experience, the RemoteFX virtual graphics processing unit (VGPU) adds a hardware accelerated experience to virtual desktops.

    To take advantage of the RemoteFX VGPU experience on a server running Windows Server 2012, you need a GPU driver (such as DirectX11.1 or WDDM 1.2) on the host server. For more information about GPU offerings to use with RemoteFX for RD Virtualization Host, please refer to your GPU provider.

    If you use the RemoteFX VGPU in your VDI deployment, the deployment capacity will vary based on usage scenarios and hardware configuration. When you plan your deployment, consider the following:


    RemoteFX Server System Memory


    For every virtual desktop that is enabled with a VGPU, RemoteFX uses system memory in the guest operating system and in the RemoteFX server. The hypervisor guarantees the availability of system memory for a guest operating system. On the server, each VGPU-enabled virtual desktop needs to advertise its system memory requirement to the hypervisor. When the VGPU-enabled virtual desktop is starting, the hypervisor reserves additional system memory in the RemoteFX server for the VGPU-enabled virtual desktop.

    The memory requirement for RemoteFX server is dynamic because the amount of memory consumed on the RemoteFX server is dependent on the number of monitors that are associated with the VGPU-enabled virtual desktops and the maximum resolution for those monitors.


    RemoteFX Server GPU Video Memory


    Every VGPU-enabled virtual desktop uses the video memory in the GPU hardwareon the host server to render the desktop. In addition to rendering, the video memory is used by a codec to compress the rendered screen. The amount of memory needed is directly based on the amount of monitors that are provisioned to the virtual machine.

    The video memory that is reserved varies based on the number of monitors and the system screen resolution. Some users may require a higher screen resolution for specific tasks. There is greater scalability with lower resolution settings if all other settings remain constant.


    RemoteFX Processor


    The hypervisor schedules the RemoteFX server and the VGPU-enabled virtual desktops on the CPU. Unlike the system memory, there isn’t information that is related to additional resources that RemoteFX needs to share with the hypervisor. The additional CPU overhead that RemoteFX brings into the VGPU-enabled virtual desktop is related to running the VGPU driver and a user-mode Remote Desktop Protocol stack.

    In the RemoteFX server, the overhead is increased, because the system runs an additional process (rdvgm.exe) per VGPU-enabled virtual desktop. This process uses the graphics device driver to run commands on the GPU. The codec also uses the CPUs for compressing the screen data that needs to be sent back to the client.

    More virtual processors mean a better user experience. We recommend allocating at least two virtual CPUs per VGPU-enabled virtual desktop. We also recommend using the x64 architecture for VGPU-enabled virtual desktops because the performance on x64 virtual machines is better compared to x86 virtual machines.

    RemoteFX GPU Processing Power


    For every VGPU-enabled virtual desktop, there is a corresponding DirectX process running on the RemoteFX server. This process replays all the graphics commands that it receives from the RemoteFX virtual desktop onto the physical GPU. For the physical GPU, it is equivalent to simultaneously running multiple DirectX applications.

    Typically, graphics devices and drivers are tuned to run a few applications on the desktop. RemoteFX stretches the GPUs to be used in a unique manner. To measure how the GPU is performing on a RemoteFX server, performance counters have been added to measure the GPU response to RemoteFX requests.

    Usually when a GPU resource is low on resources, Read and Write operations to the GPU take a long time to complete. By using performance counters, administrators can take preventative action, eliminating the possibility of any downtime for their end users.

    The following performance counters are available on the RemoteFX server to measure the virtual GPU performance:


    RemoteFX Graphics


    • Frames Skipped/Second - Insufficient Client Resources:
      Number of frames skipped per second due to insufficient client resources

    • Graphics Compression Ratio:
      Ratio of the number of bytes encoded to the number of bytes input

    RemoteFX Root GPU Management


    • Resources: TDRs in Server GPUs:
      Total number of times that the TDR times out in the GPU on the server

    • Resources: Virtual machines running RemoteFX:
      Total number of virtual machines that have the RemoteFX 3D Video Adapter installed

    • VRAM: Available MB per GPU:
      Amount of dedicated video memory that is not being used

    • VRAM: Reserved % per GPU:
      Percent of dedicated video memory that has been reserved for RemoteFX

    RemoteFX Software


    • Capture Rate for monitor [1-4]:
      Displays the RemoteFX capture rate for monitors 1-4

    • Compression Ratio:
      Deprecated in Windows 8 and replaced by Graphics Compression Ratio.

    • Delayed Frames/sec:
      Number of frames per second where graphics data was not sent within a certain amount of time

    • GPU response time from Capture:
      Latency measured within RemoteFX Capture (in microseconds) for GPU operations to complete

    • GPU response time from Render:
      Latency measured within RemoteFX Render (in microseconds) for GPU operations to complete

    • Output Bytes:
      Total number of RemoteFX output bytes

    • Waiting for client count/sec:
      Deprecated in Windows 8 and replaced by Frames Skipped/Second - Insufficient Client Resources

    RemoteFX VGPU Management


    • Resources: TDRs local to virtual machines:
      Total number of TDRs that have occurred in this virtual machine (TDRs that the server propagated to the virtual machine are not included)

    • Resources: TDRs propagated by Server:
      Total number of TDRs that occurred on the server and that have been propagated to the virtual machine

    The following performance counters are present on the virtual desktop to measure the virtual GPU performance:

    RemoteFX Virtual Machine VGPU Performance


    • Data: Invoked presents/sec:
      Total number (in seconds) of present operations to be rendered to the desktop of the virtual machine per second

    • Data: Outgoing presents/sec:
      Total number of present operations sent by the virtual machine to the server GPU per second

    • Data: Read bytes/sec:
      Total number of read bytes from the RemoteFX server per second

    • Data: Send bytes/sec:
      Total number of bytes sent to the RemoteFX server GPU per second

    • DMA: Communication buffers average latency (sec):
      Average amount of time (in seconds) spent in the communication buffers

    • DMA: DMA buffer latency (sec):
      Amount of time (in seconds) from when the DMA is submitted until completed

    • DMA: Queue length:
      DMA Queue length for a RemoteFX 3D Video Adapter

    • Resources: TDR timeouts per GPU:
      Count of TDR timeouts that have occurred per GPU on the virtual machine

    • Resources: TDR timeouts per GPU engine:
      Count of TDR timeouts that have occurred per GPU engine on the virtual machine

    In addition to the RemoteFX VGPU performance counters, users can measure the GPU utilization by using the new Process Explorer feature, which shows video memory usage and the GPU utilization.
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    Performance Tuning Guidelines for Windows Server 2012 April 12, 2013 Abstract

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