![]() ![]() As much as possible, previously sent bitmaps are reused resulting in lower bandwidth. Intelligent bitmap matching for a bitmap-only provider.Thinwire+(Compability mode): Thinwire Compatibility Mode uses new screen decomposition and caching techniques, which achieve low bandwidth usage and high server scalability without compromising the end-user experience. The codec runs completely on the server CPU (not in GPU) and allows for a desktop with desktop composition (Aero in Win7) to be delivered to any device although at the cost of additional server side CPU. Therefore this graphics mode is the default setting instead of the legacy mode in XenApp and XenDesktop 5.6. ![]() The encoder used in previous versions of XenApp and XenDesktop cannot be loaded in Windows 8 and is not optimized for Server 2012. H.264 Enhanced SuperCodec, initially part of HDX 3D Pro, the H.264 encoder is now part of the enhanced HDX SuperCodec graphics mode and allows for the delivery of Windows 8 and Server 2012 desktops. DCR is also now available on Mac end-points with Receiver 11.9. With Receiver 4.2 DCR will leverage an H.264 adaptive display. With existing Windows Receivers 3.x to 4.1 DCR can leverage adaptive graphics similar to those found in XenDesktop 5.x (JPEG). (Disabling Aero in Win 7 will also disable DCR.) DCR in XenDesktop 7.6 has several improvements that lower its bandwidth requirements, including adaptive graphics. Therefore, DCR should be disabled for WAN users accessing a XenDesktop 7.5 and below VDA. Prior to XenDesktop 7.6, DCR required significantly more bandwidth because it did not leverage any adaptive settings (it is fixed quality). DCR was set as the default option for desktop VDAs because desktop composition cannot be disabled with Windows 8 and above. DCR offloads DirectX commands used by the Desktop Windows Manager to the user’s Windows device which reduces CPU load on the server. ![]() It might be useful to get a basic understanding of the differences between those HDX Graphics modes so from the Citrix Consulting: HDX 7.X: Do You Know Your Graphics Mode? article:ĭesktop Composition Redirection (DCR) is based on the Aero Redirection feature introduced with XenDesktop 5.x. The difference in the two tests came from a change in the HDX graphic modes, the default is based on the installed VDA and can obviously be changed by using the Citrix policies. Between those two tests (we executed multiple runs of the same test to verify results) we saw a noticeable difference between the two scenarios while we only changed the VDA in the golden image. ![]() The setup Will was using was based on XenDesktop 7.9 with Nutanix AHV and the latest AOS version and LoginVSI to do some performance testing. The test was run with version 7.6 of the Citrix VDA but because the official support for AHV comes with XenDesktop 7.9 we requested to install the corresponding VDA (v7.9) on his golden image. This was the start of more research and an interesting discussion with Citrix. HDX Graphics modes, we all love them for being so flexible and most of us know it can impact the user experience but we noticed that choosing the right HDX Graphics mode can impact your desktop density too.ĭuring some of the benchmarking by the performance team of Nutanix (Thanks a million Will Strickland!) we ran in to density differences when the Citrix Virtual Delivery Agent got upgraded from version 7.6 to 7.9. ![]()
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