Bug 866186 - "Max free Memory for scheduling new VMs" reporting negative values
Summary: "Max free Memory for scheduling new VMs" reporting negative values
Alias: None
Product: Red Hat Enterprise Virtualization Manager
Classification: Red Hat
Component: ovirt-engine
Version: 3.1.0
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: ---
Assignee: Roy Golan
QA Contact: Ido Begun
Whiteboard: infra
Depends On:
TreeView+ depends on / blocked
Reported: 2012-10-14 14:39 UTC by Ido Begun
Modified: 2016-02-10 19:16 UTC (History)
11 users (show)

Fixed In Version: si22
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed:
oVirt Team: Infra
Target Upstream Version:

Attachments (Terms of Use)
Logs (739.75 KB, application/x-gzip)
2012-10-14 14:39 UTC, Ido Begun
no flags Details

Description Ido Begun 2012-10-14 14:39:20 UTC
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 15:46:45 UTC
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 12:54:50 UTC
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 14:04:52 UTC

Comment 7 Ido Begun 2012-11-01 16:34:17 UTC
OK - SI23

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

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