[Xen-users] A difference between allocated and available memory in Xen virtual guest

[Michal Vyoral <michal.vyoral@xxxxxxx>]

Hello,
I have allocated 4 GB memory for a guest instance on the Xen hypervisor. 
But within the instance there is only 2 GB memory available. See the details, 
the guest is named pr-idm:

# Allocated memory on the hypervisor
[root@pr-hyp xen]# xm list
Name                                      ID Mem(MiB) VCPUs State   Time(s)
Domain-0                                   0     3846     8 r-----   5382.2
ldms                                       4     2007     2 -b----   2658.4
pr-idm                                     8     4007     2 -b----     15.1
pr-wstat                                   3      507     1 -b----    931.7
test_ldap1                                 5      775     2 -b----    127.7
test_ldap2                                 6      775     2 -b----    201.5

# Available memory on the guest
[root@pr-idm ~]# free
             total       used       free     shared    buffers     cached
Mem:       2008344     140844    1867500          0       6016      31984
-/+ buffers/cache:     102844    1905500
Swap:            0          0          0

# Distribution of the guest
[root@pr-idm ~]# cat /etc/issue
CentOS release 6.2 (Final)
Kernel \r on an \m

# Distribution of the hypervisor
[root@pr-hyp xen]# cat /etc/issue
CentOS release 5.7 (Final)
Kernel \r on an \m

# Versions of the Xen packages
[root@pr-hyp xen]# rpm -qa | grep xen
kernel-xen-2.6.18-274.3.1.el5
kernel-xen-2.6.18-308.1.1.el5
xen-libs-3.0.3-135.el5_8.2
xen-3.0.3-135.el5_8.2
kernel-xen-2.6.18-274.18.1.el5
xen-libs-3.0.3-135.el5_8.2

Could it be some problem with the memory usage?
Thank you.

Best regards,
Michal Vyoral

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