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I have Centos 4.1 running on Xen (Dom0), and it works fine. However,
when I try to start a new domain via xm create, I get the following
error:

Error: Error creating domain: (12, 'Cannot allocate memory')

I have 512 MB on the machine.

Here are some copies of output:

[root@persephone rc3.d]# xm list
Name Id Mem(MB) CPU State Time(s) Console
Domain-0 0 57 0 r---- 88.2

[root@persephone rc3.d]# xm info
system : Linux
host : persephone
release : 2.6.11.10-xen0
version : #1 Sun May 22 11:38:50 BST 2005
machine : i686
cores : 1
hyperthreads_per_core : 1
cpu_mhz : 400
memory : 511
free_memory : 435

[root@persephone rc3.d]# cat /etc/xen/xen.conf
kernel = "/boot/vmlinuz-2.6-xenU"
memory = 128
name = "Test"
disk = ['phy:hda5,hda5,w']
root = "/dev/hda5 ro"

After running the command, I have some seemingly zombie domains:

[root@persephone rc3.d]# xm create /etc/xen/xen.conf -c
Using config file "/etc/xen/xen.conf".
Error: Error creating domain: (12, 'Cannot allocate memory')

[root@persephone rc3.d]# xm list
Name Id Mem(MB) CPU State Time(s) Console
Domain-0 0 57 0 r---- 90.4
Domain-6 6 128 0 --p-- 0.0

I have to kill them using xm destroy Domain-X. Note that I do not
specify the name of Domain-X; instead, it is supposed to be called
Test.

I have tried using balloon to adjust memory on Dom-0, and while that
works (xm list shows the new amount being used), it does not allow me
to create any new domains.

Thanks in advance for the help!
--
Wyatt

Accident, n.:
A condition in which presence of mind is good, but absence of
body is better.
-- Foolish Dictionary