[CentOS-virt] centos6 and xen4 dom0 memory allocation
peter.peltonen at gmail.com
Wed Oct 19 17:37:34 EDT 2011
This is slightly OT as xen is not officially supported in EL6. But
maybe someone else is running it on centos6 as well and could help me
I have problems allocating a static amount of memory for my xen dom0.
It seems to reduce when new domUs are created, even though I *think*
ballooning is disabled. Can someone advise me what I'm doing wrong?
I have xen-4.1.1-3 installed from
http://xenbits.xen.org/people/mayoung/EL6.xen on my centos6 server. I
am running 2.6.32-131.12.1.el6.xendom0.x86_64 kernel available from
the same place. 'xl info' reports about available memory as follows:
total_memory : 24567
free_memory : 3698
xen_commandline : dom0_mem=2048M
and in xend-config.sxp I have:
Now one would think that I should have 2048M memory for dom0, right? I
started from there, but when starting domUs it has been reduced to
1140M even though I think ballooning is disabled and there is free
memory available? And the weird thing is that dom0 has done some
# free -mt
total used free shared buffers cached
Mem: 1140 1052 88 0 2 12
-/+ buffers/cache: 1038 102
Swap: 8194 85 8109
Total: 9335 1138 8197
Shutting down domUs and making more memory available does not reverse
the effect, dom0 does not allocate more memory.
What am I missing here or is my xen setup acting strangely here?
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