Xen users - Jun 2005 - Xen can''t use all the memory in my system ?

Hello people,
I have problems when I try to use the total amount of memory that I have in 
my system. It has 128Mb and when I create two Debian VM I get this:
XENmaster:/etc/xen# xm list
Name Id Mem(MB) CPU State Time(s) Console
Debian2 1 31 0 -b--- 47.1 9601
Debian3 2 31 0 -b--- 49.6 9602
Domain-0 0 26 0 r---- 1012.9

I have limited the VM''s memory to 32 Mb. The VM config files are like
this:

kernel = "/boot/vmlinuz-2.6.11-xenU"
memory = 32
name = "Debian2"
nics = 1
ip = "192.168.50.198 <http://192.168.50.198>"
disk = [ ''file:/vmDebian2,sda1,w'',
''file:/vmDebianSwap2,sda2,w'' ]

If I try to rise those 32Mb to fit the real memory in my system I get a 
message saying that It can not allocate that memory. I don''t really
know
why. 



PS: I''ve got something better:

XENmaster:/etc/xen# xm list
Name Id Mem(MB) CPU State Time(s) Console
Debian2 1 31 0 -b--- 47.4 9601
Debian3 2 31 0 -b--- 49.9 9602
Domain-0 0 26 0 r---- 1018.7
ttylinux1 3 15 0 -b--- 0.7 9603


But I still have 23 Mb of free memory, why can''t I use it ? 

Thank you!! 
Regards, Miguel.


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