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in reference to:"Remote Desktop Services (Terminal Services) Team Blog This Blog Email Syndication RSS 2.0 Atom 1.0 Search var WLSearchBoxConfiguration= { "global":{ "serverDNS":"www.bing.com", "market":"en-US" }, "appearance":{ "autoHideTopControl":false, "width":600, "height":400, "theme":"Blue" }, "scopes":[ { "type":"web", "caption":"Remote Desktop Services (Terminal Services) Team Blog", "searchParam":"site:blogs.msdn.com/rds/" } , { "type":"web", "caption":"Web", "searchParam":"" } ] } Tags API Application Compatibility App-V Audio Authentication Author: Ahmed Tolba Author: Al Henriquez Author: Alex Balcanquall Author: Anubhav Kushwaha Author: Archan Das Author: Aruna Somendra Author: Ayesha Mascarenhas Author: Christa Anderson Author: Costin Hagiu Author: David Liu Author: Elton Saul Author: Gaurav Daga Author: George Zhu Author: Gopikrishna Kannan Author: Huei Wang Author: Ivan Brugiolo Author: James Baker Author: Janani Venkateswaran Author: Jiazhi Ou Author: Kashif Mehmood Author: Kaustubh Bansal Author: Kevin London Author: Klaas Langhout Author: Mahadev Alladi Author: Mahesh Lotlikar Author: Maxim Oustiougov Author: Mayuri Kandra Author: Munindra Das Author: Nadim Abdo Author: Nelly Porter Author: Olga Ivanova Author: Pushkar V. 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On a low bandwidth connection these applications compete for available bandwidth. As a result, important graphics data, such as the location of a window the user moves on the desktop, has to compete with data transmitted in the background, like a print job or a file copy. This problem manifests itself most severely when printing a large document over a low bandwidth connection. The printer data competes for available bandwidth with the video rendering, thus deteriorating the graphics rendering significantly. In Vista (and Longhorn Server) we fix this by introducing a simple scheme wherein a fixed percentage of bandwidth is allocated to video, and the rest goes to virtual channel traffic (this means all kind of redirections). By default this allocation is 70% for Video and 30% for virtual channel data, meaning when bandwidth usage is under pressure video data is guaranteed to get 70% of the available bandwidth. Although this scheme does solve the problem effectively, there could be some scenarios that might want to tweak it a bit. There are some registry values that can be set to tweak these settings. <Note these are unsupported settings so all the legal disclaimers apply!> A reboot is required for these setting to take effect. Below is the list of registry values that affect the bandwidth allocation behavior. These are all DWORD values under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermDD FlowControlDisable: When set to 1 this value will disable new flow control algorithm; making it essentially FIFO (First-In-First-Out) for all packet requests. This provides results similar to win2k3. (Default for this value is 0). FlowControlDisplayBandwidth / FlowControlChannelBandwidth: These two values together determine the bandwidth distribution between display and virtual channels. You can set these values in the range of 0-255. For example setting FlowControlDisplayBandwidth = 100 and FlowControlChannelBandwidth = 100 will make the equal bandwidth distribution between video and VCs. The default is 70 for FlowControlDisplayBandwidth and 30 for FlowControlChannelBandwidth, thus making the default distribution equal to 70-30. FlowControlChargePostCompression: This value if set to 1 bases the bandwidth allocation on post-compression bandwidth usage. Default for this value is 0 - meaning the bandwidth distribution is applied on Pre-Compressed data."
- Remote Desktop Services (Terminal Services) Team Blog : Bandwidth Allocation for Terminal Server connections over RDP (view on Google Sidewiki)
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