Hi,
did you put the host to maintenance and activated it again when you
enabled ballooning? Or search for a slightly hidden Sync MOM policy
link somewhere in the host area that would force it.
The log seems to indicate ballooning is either disabled or "not necessary".
Martin
On Tue, Jul 31, 2018 at 12:07 PM, <jeanbapti...@nfrance.com> wrote:
> 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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