Hello, thanks for a very nice report. We think it really is an issue that should be fixed. Can you please create an official bug report in bugzilla.redhat.com and send us the bug number so we can properly track it? Best regards -- Martin Sivák msivak@redhat.com Red Hat Czech RHEV-M SLA / Brno, CZ ----- Original Message -----
Hello
Context : oVirt Engine Version: 3.3.0-4.el6 Hypervisor VDSM : vdsm.x86_64 - 4.12.1-2.el6
A vm : - Memory Size : 1024 Mo - Physical Memory Guaranteed : 128 Mo ;) - Memory balloon device enabled the vm is running with nearly no activity to have a constant memory used
Testcase 1 : Initial run No change to the balloon
Total Memory = Balloon 1024 Mo Data from vdsClient getVmStats
balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '1048576', 'balloon_cur': '1048576'} memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '920308', 'swap_in': '0', 'pageflt': '7', 'mem_total': '1020576', 'mem_unused': '863500'} Here : mem_total - mem_unused = 157076 correct
Data get from api (REST or Python : statistics.'memory.used') Memory used 128849018.0 = 123 Mo
-------------------------------------------------------------- If i modify the balloon by the command vdsClient setBalloonTarget 524288 (512*1024) i got vds balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '524288', 'balloon_cur': '524288'} memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '396044', 'swap_in': '0', 'pageflt': '7', 'mem_total': '496288', 'mem_unused': '339228'} mem_total - mem_unused = 157076 correct value
API.statistics Memory used = 665719930.0 = 635 Mo ==> (512+123)
--------------------------------------------------------------
Setting a balloon to 262144 (256*1024)
balloonInfo = {'balloon_max': '1048576', 'balloon_min': '131072', 'balloon_target': '262144', 'balloon_cur': '262144'} memoryStats = {'swap_out': '0', 'majflt': '0', 'mem_free': '133916', 'swap_in': '0', 'pageflt': '6', 'mem_total': '234144', 'mem_unused': '76224'}
mem_total - mem_unused = correct value
API.statistics: Memory used = 934155386.0 = 891 Mo (768+123)
To get the correct value from the api i need to fdo [ (Memory Used/1024)- (Balloon Max - Balloon Current) ] / 1024
-------------
Of course display in manager is also wrong
No Balloon parameter modified
http://screencast.com/t/rGhKJgeB2ol
Balloon 512
http://screencast.com/t/L7geTfnI
Balloon 256
http://screencast.com/t/8jBllKXtGt7
Should we consider this as a bug ? Do you plan to change the formula to compupte the memory used ?
Regards
Hervé Leclerc CTO Alter Way 1, rue royale 9 ème étage 92210 St Cloud +33 1 78152407 +33 6 83979598
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