Bug 866186 - "Max free Memory for scheduling new VMs" reporting negative values
"Max free Memory for scheduling new VMs" reporting negative values
Product: Red Hat Enterprise Virtualization Manager
Classification: Red Hat
Component: ovirt-engine (Show other bugs)
Unspecified Unspecified
unspecified Severity medium
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Assigned To: Roy Golan
Ido Begun
Depends On:
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Reported: 2012-10-14 10:39 EDT by Ido Begun
Modified: 2016-02-10 14:16 EST (History)
11 users (show)

See Also:
Fixed In Version: si22
Doc Type: Bug Fix
Doc Text:
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Type: Bug
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oVirt Team: Infra
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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2012-10-14 10:39 EDT, Ido Begun
no flags Details

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Description Ido Begun 2012-10-14 10:39:20 EDT
Created attachment 626993 [details]

Description of problem:
"Max free Memory for scheduling new VMs" is reporting negative values.

Version-Release number of selected component (if applicable):

Using a 16GB host, I've added 2 VM's with 8GB each (of which 4GB are guaranteed), and ran them.

>> vdsClient -s 0 getVdsCaps | grep memSize
memSize = 15829

>> vdsClient -s 0 getVdsCaps | grep reservedMem
reservedMem = 321

With those numbers, I got:

Max free Memory for scheduling new VMs = -1006 MB
Comment 1 Simon Grinberg 2012-10-14 11:46:45 EDT
This may happen due to over commit being just an estimation for the actual consolidation capabilities. However any negative value in calculation should be translated to 0 on the value reported to the UI and API.
Comment 2 Amador Pahim 2012-10-15 08:54:50 EDT
The negative value seems expected. According with BZ#846677, the field calculation formula is:

   ( over commit * host memory )
   ( host memory committed + host reserved )

In your case, if overcommit policy is "no overcommit", you need to add 1518 MB to host in order to run a new VM with Physical Memory Guaranteed = 512 MB, for example. Or change the overcommit policy.
Comment 3 Roy Golan 2012-10-21 10:04:52 EDT
Comment 7 Ido Begun 2012-11-01 12:34:17 EDT
OK - SI23

"Max free Memory for scheduling new VMs" no longer reports negative values - reports 0 instead.

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