run "xm list" and you see memory allocations to each domain.
If you run "xm mem-set " you should be able to allocate that memory to domain 0 (if it needs it)

xm mem-set 0 512

Would allocate 512MB to domain 0.

On Mon, 2007-03-05 at 16:39 -0400, John Sanabria wrote:

Hi,

i had installed the last updates for FC6 in a machine with 1 Giga of RAM.
The machine's ip is 136.145.116.88.

------------------------------------------------------
[root@dhcp-crl-116-88 ~]# free
             total       used       free     shared    buffers     cached
Mem:        962032     281512     680520          0      16116     191412
-/+ buffers/cache:      73984     888048
Swap:      2031608          0    2031608
[root@dhcp-crl-116-88 ~]# uname -a
Linux dhcp-crl-116-88.ece.uprm.edu 2.6.19-1.2911.6.4.fc6xen #1 SMP Sat Feb

24 14:57:17 EST 2007 i686 i686 i386 GNU/Linux
------------------------------------------------------

now, i execute a "xm create xentemplate_6 -c", and voila! i lost approx
250 Mbytes of PHYSICAL RAM, :-(
------------------------------------------------------
[root@dhcp-crl-116-88 ~]# free
             total       used       free     shared    buffers     cached
Mem:     -> 764928 <-  375796     389132          0      17536     281980
-/+ buffers/cache:      76280     688648
Swap:      2031608          0    2031608
------------------------------------------------------

then, shutdown the virtual machine, and i did not get back the lost 250
Mbytes of RAM.
anybody knows how to get back my physical memory after to shutdown the
virtual machine? is that behavior a bug?

if i run two virtual machines, my physical memory is reduced until 512 MB
of Physical RAM. At this time, the only way to get 1Gbyte of RAM is
rebooting the machine :-(.

Thanks a lot for your suggestions.

http://ece.uprm.edu/~s047267
http://del.icio.us/josanabr
http://blog-grid.blogspot.com

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