[Bug 997014] Re: [SRU] Memory is not correctly computed for Xen+libvirt

Johann Evans 997014 at bugs.launchpad.net
Tue Feb 14 11:17:34 UTC 2017

This also affects CentOS release on Newton

** Also affects: nova (CentOS)
   Importance: Undecided
       Status: New

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  [SRU] Memory is not correctly computed for Xen+libvirt

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) essex series:
  Fix Released
Status in nova package in Ubuntu:
  Fix Released
Status in nova source package in Precise:
  Fix Released
Status in nova package in CentOS:

Bug description:
  The current code in libvirt/connection.py does not compute the memory
  usage correctly when using Xen. It takes the information from
  /proc/meminfo whose information is not correct (at least for Xen 4.1.2
  on Ubuntu). I've spotted the following situations:

   - No memory limit on the dom0. Whenever a machine is spawned, the
  dom0 memory might be ballooned down, so the memory reported by meminfo
  is also shrinked. This causes that the memory_mb column in the
  compute_nodes table changes.

   - Memory limit on the dom0 (i.e  dom0_mem option in grub). Meminfo
  only shows the memory available for the dom0, but will not honour the
  total memory and the memory that is actually available for the domUs
  (xm info|grep memory).

  I'm currently working on a fix, that I hope will be submitted soon.

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