Hello,
I'm trying to test Memory balloon useful functionality, but l'm unable to make
it work successfuly.
Firstly, I enable the MOM on my Cluster:
Memory Balloon
Enable Memory Balloon Optimization
Secondly, I configure a VM virtual machine like this:
On system tab:
Memory Size : 28672 MB
Maximum memory : 28672 MB
On Ressource allocation tab:
Memory Allocation:
Physical Memory Guaranteed : 2048 MB
Memory Balloon Device: Enabled
Thirdly, I test
1- I boot the VM. After boot VM consume 200MB
2- I lauch perl program which consume 26GB.
3- During this, Host RAM usage is near 90%
4- I stop the perl program, and on guest side, RAM usage drop down to 200Mo
5- On host side, RAM usage keep to 24 - 26GB. I wait some time to show if the
qemu-vm process drop is host-ram-usage. Ram usage keep to 24GB.
6- I try to launch another VM like the first one (but with 8GB RAM and 2GB
Guaranteed) , on the host (to "force" Mom ?) but I'm unable to lauch it, Host
free mem is insufficient
I change MoM log to debug to show something:
2018-07-31 11:49:31,887 - mom.RPCServer - INFO - ping()
2018-07-31 11:49:31,888 - mom.RPCServer - INFO - getStatistics()
2018-07-31 11:49:31,888 - mom.Monitor - DEBUG - Field 'mem_free' not known.
Ignoring.
2018-07-31 11:49:43,313 - mom.VdsmRpcBase - DEBUG - VM List:
[u'9632443f-d302-43f7-a279-778e64ee98f4']
2018-07-31 11:49:43,465 - mom.VdsmRpcBase - DEBUG - Memory stats: {'swap_out':
0, 'swap_usage': 0, 'mem_free': 28221020, 'major_fault': 0, 'swap_in': 0,
'swap_total': 0, 'mem_available': 28650472, 'minor_fault': 99, 'mem_unused':
28221020}
2018-07-31 11:49:43,468 - mom.Monitor - DEBUG - Collector
<mom.Collectors.GuestIoTuneOptional.GuestIoTuneOptional instance at 0x167de18>
did not return any data
2018-07-31 11:49:43,931 - mom.RPCServer - INFO - ping()
2018-07-31 11:49:43,932 - mom.RPCServer - INFO - getStatistics()
2018-07-31 11:49:43,932 - mom.Monitor - DEBUG - Field 'mem_free' not known.
Ignoring.
2018-07-31 11:49:44,258 - mom.Monitor - DEBUG - Field 'mem_free' not known.
Ignoring.
2018-07-31 11:49:44,284 - mom.Evaluator - DEBUG - debug: ('No shared pages,
setting ksm_merge_across_nodes to', 1)
2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: ('entry:
apply_NUMA_policy',)
2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: (1,
'=ksm_merge_across_nodes ACTUAL from kernel')
2018-07-31 11:49:44,286 - mom.Evaluator - DEBUG - debug: (1,
'=ksmMergeAcrossNodes REQUIRED from oVirt-engine')
2018-07-31 11:49:44,289 - mom.Evaluator - DEBUG - debug: ('exit:
apply_NUMA_policy return_value = ', 0)
2018-07-31 11:49:44,310 - mom.Policy - DEBUG - Results: [0, 1, 1, 1, 0, 1, 1,
0.2, 0.05, 0.2, 0.05, 0.0025, 'change_big_enough', 'shrink_guest',
'grow_guest', 0.22506353015141964, 'balloon_logic', [0], 'guest_qos', [0], 300,
-50, 64, 1250, 10, 0.2, 'change_npages', 'apply_NUMA_policy', 6550590.4,
30058208, None, 0, 0, None, -1, 100000, 'check_and_set_quota',
'reset_quota_and_period', [None], 0, 'set_io_limits', 'reset_io_limits', [0]]
Does I miss something ? MoM behavior ?
Thanks for all !
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