Allan,

/3GB switch caused a lot of problems on a Citrix server one time since the 
Citrix sessions still use Kernel process space and it is very easy to run out 
especially with /3GB and no more sessions can be created even though there is 
plenty of RAM available. A "consultant" told us that this was the best way to 
handle this server and of course management said to do it.  After that, I spend 
a fair amount time learning all of the issues involving memory and Citrix so 
that I could "advise" management on what really worked.

Todd

Further complicated because the 32-bit Windows splits the memory into a "user 
space" and a "kernel space".  The user space is available to applications and 
the kernel space is used by Windows itself and device drivers.  By default up 
to 2GB will be allocated to user space.  If you put the /3GB switch in the 
boot.ini file, you change that to allow 3GB to be available to user 
applications.  This is often done with single-purpose machines (servers) that 
do little else but run one piece of software, such as SQL Server, in order to 
give more RAM to the software.

Allan

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