David, This is a very interesting approach and I will put this to test next week and let you know if I experience the same results or not.
Trey -----Original Message----- From: David Burgess [mailto:apt....@gmail.com] Sent: Friday, March 19, 2010 4:43 PM To: ltsp-discuss@lists.sourceforge.net Subject: [Ltsp-discuss] mitigating the effects of RDP logon refreshes If you use ltsp (or any other rdesktop solution) for connecting to a Windows terminal server, then you will have noticed that the logon screen refreshes itself at a regular interval, something like every minute on Server 2008, and more frequently than that on R2. I assume this is because the server is killing the logon session and the client is forced to reestablish it. We have 16 thin clients connecting to a 2008 terminal server and the cumulative effect of this constant reconnecting is a baseline CPU usage averaging around 35% across all four cores (dual-dual Xeon 5...@2.66ghz), with regular spikes up to 100% on all cores simulatneously. Even between spikes, usage generally hovers somewhere above 0 in the task manager. It is bad enough that a client that is logged in and doing light web browsing will actually lower the CPU usage in some cases. This annoyed me and I went looking for a way to disable the constant reconnecting. No such luck (apparently you can rewrite gina.dll to change this behaviour). So I went looking for alternative workarounds and may have found something that helps. I downloaded Microsoft's Interrupt-Affinity Policy Tool (http://www.microsoft.com/whdc/system/sysperf/IntPolicy.mspx) and tied the NIC to a single processor. Just like that, my average CPU utilization has dropped below 10%. Looking at task mananger, I'm still getting synchronous CPU spikes across all 4 cores (mostly kernel time), but the spikes are far less frequent, with CPU usage returning to 0 in between. This result is preliminary, and of course totally unscientific, but the effect was immediate and obvious enough that it warrants some attention. I'd like to know if anybody else has tried this or other tricks to mitigate the effects of the eternally reloading Windows logon screen. db ---------------------------------------------------------------------------- -- Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _____________________________________________________________________ Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto: https://lists.sourceforge.net/lists/listinfo/ltsp-discuss For additional LTSP help, try #ltsp channel on irc.freenode.net
