Xen users - Jan 2009 - "Out of Memory" phenomenon with Xen 3.03 on Dual Pentium III

I have setup a Dual Pentium III server (4 GB RAM) with CentOS 5.2  
32Bit and Xen 3.03. Now I have a weird phenomenon:

I have 2 virtual machines running, using 1.25 GB of RAM together. xm  
list shows dom0 using 2.2 GB. I cannot start another virtual machine;  
if I try, I get the error:

ERROR Out of memory: xc_dom_boot_mem_init: can''t allocate low memory  
for domain

I do not have this phenomenon with CentOS 32 Bit and Xen 3.03 on other  
machines (mostly xeon processors without hardware virtualization).

Is this a known problem on this old platform? Is there some  
configuration that can be used to work around it?

Thanks for any hint or help.

Dirk 


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