winsrv.dll!StartCreateSystemThreads problem - csrss.exe high I/O

Hi,

I've a problem on one Windows 2003 R2 server.
One csrss.exe process produces extremly high I/O ~100 MB/s.
Server is unusable slow.

The problem is this thread:
winsrv.dll!StartCreateSystemThreads
It creates a lot of taskswitches.
I googled it and found hints about Terminal server, I installed these
hotfixes but they didn't help.
The Csrss.exe process in a terminal-server session continuously consumes
more than 50 percent of CPU
resources on a Windows Server 2003-based terminal server
http://support.microsoft.com/kb/934330
You experience slow performance and high CPU utilization on a Windows
Server 2003 Terminal Server
http://support.microsoft.com/?kbid=937375

The security log is full of Event ID 538 & 540, all domain controllers log
on and log off on this host round robin.
DOMAIN\DC01$
DOMAIN\DC02$
DOMAIN\DC03$
....
DOMAIN\DC04$
and than again
DOMAIN\DC01$
DOMAIN\DC02$
DOMAIN\DC03$
....
DOMAIN\DC04$

3-4 logons per second, logon type is 3

The server is used for matrix42 Empirum (management software)

What can I do to narrow it down?

greetings
Carsten
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