Application redraw issue over Citrix and Terminal Server

Hi All,
We provide a client-server application which connects to a SQL Server database. The middle-tier is hosted on an application server (Windows Server 2008 R2) which in turn connects to the SQL Server database. The fat client can either be installed on user laptops/desktops
or published using Citix/Terminal services.
We have a long standing issue which frankly I just cannot fathom. A customer has published the client via Citrix to users and using roaming profiles. If an employee is using the application in London, the roaming profile is created on a server in London and
connects to the middle-tier in London. If an employee is using the application in Glasgow, the roaming profile is created in Edinburgh and the user connects to the middle-tier in London. The customer is also using DFS
The roaming profile consists of the 'My Documents', 'My Pictures', 'My Videos', 'My Music' and 'Windows' folder. Distributed File System (DFS) is used for roaming profile folder replication between offices. See http://technet.microsoft.com/en-gb/library/cc732863%28v=ws.10%29.aspx
The Edinburgh users are experiencing application redraw issue where the interface loads in chunks. For example, when a user scrolls up and down or left and right, the data loads immediately (from SQL Server) but the interface (GUI) loads in blocks. You can
actually see each segment of the GUI components loading. The issue also occurs if connecting via a Terminal Server where the application is also installed.
For London users, it all works fine. If an Edinburgh user comes to London, they have no issues.
The network connection is super fast between the various offices.
The application is built using C++ and Delphi and uses the GDI API to draw the objects.
Any guidance is appreciated.

Hello partner,
Thanks for contacting Microsoft. This is Sophia who is going to help with this issue. From your description, I learnt that users from Edinburgh have application redraw issue. However, London users worked fine. Please let me know if I misunderstand your purpose.
Based on the information, it seems that the issue located in the middle-tier in London. Could you try building a middle-tier in Edinburgh and then test how the issue goes?
Besides, based on my experience and research, by default the allocation of the bandwidth is 70 percent for graphics data and 30 percent for virtual channel data, meaning when bandwidth usage is under pressure, graphics data is guaranteed to get 70 percent
of the available bandwidth. And we can tweak the settings a bit for some scenarios. To change the settings, we can set registry values. Please reference the information below.
===========================================================================================================================================
Note: For these settings to take effect, the computer must be restarted.
Following 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 disables the new flow control algorithm, making it essentially First-In-First-Out (FIFO) for all packet requests. This provides results similar to Windows Server
2003. (The 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 creates an 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: If set to 1, this value bases the bandwidth allocation on post-compression bandwidth usage. The default for this value is 0, which means that the bandwidth distribution is applied
on pre-compressed data.
For more information about RDP Bandwidth, please reference the article below.
================================================
Bandwidth Allocation for Terminal Server connections over RDP
http://blogs.msdn.com/b/rds/archive/2007/04/09/bandwidth-allocation-for-terminal-server-connections-over-rdp.aspx
Top 10 RDP Protocol Misconceptions – Part 1
http://blogs.msdn.com/b/rds/archive/2009/03/03/top-10-rdp-protocol-misconceptions-part-1.aspx
If you have any concerns about the action plan above, feel free to let me know.
Best regards,
Sophia Sun
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Message was edited by:
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