xenapi out of memory errors

[Brian Elliott]

On xenapi, we have observed instance builds successfully passing resource tracker claims, but then failing on dom0 due to out of memory errors.

['HOST_NOT_ENOUGH_FREE_MEMORY', '8662286336', '8652775424']
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/compute/manager.py", line 1043, in _build_instance
    set_access_ip=set_access_ip)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/compute/manager.py", line 1248, in _spawn
    LOG.exception(_('Instance failed to spawn'), instance=instance)
  File "/usr/lib/python2.6/contextlib.py", line 23, in __exit__
    self.gen.next()
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/compute/manager.py", line 1244, in _spawn
    block_device_info)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/driver.py", line 177, in spawn
    admin_password, network_info, block_device_info)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 594, in spawn
    undo_mgr.rollback_and_reraise(msg=msg, instance=instance)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/utils.py", line 974, in rollback_and_reraise
    self._rollback()
  File "/usr/lib/python2.6/contextlib.py", line 23, in __exit__
    self.gen.next()
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 589, in spawn
    boot_instance_step(undo_mgr, vm_ref)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 220, in inner
    rv = f(*args, **kwargs)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 536, in boot_instance_step
    admin_password, image_meta)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 801, in _boot_new_instance
    self._start(instance, vm_ref)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/vmops.py", line 397, in _start
    False, False)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/nova/virt/xenapi/driver.py", line 723, in call_xenapi
    return session.xenapi_request(method, args)
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/XenAPI.py", line 133, in xenapi_request
    result = _parse_result(getattr(self, methodname)(*full_params))
  File "/opt/rackstack/264.37/nova/lib/python2.6/site-packages/XenAPI.py", line 203, in _parse_result
    raise Failure(result['ErrorDescription'])

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/35380
Committed: http://github.com/openstack/nova/commit/7524194b2f1dd0ab159933d5ffab1cab461f5e6f
Submitter: Jenkins
Branch: master

commit 7524194b2f1dd0ab159933d5ffab1cab461f5e6f
Author: Brian Elliott <email address hidden>
Date: Sun Jun 30 16:34:25 2013 +0000

    xenapi: Add per-instance memory overhead values

    Add calculation of per-instance memory virtualization overhead to
    xenapi driver.

    bug 1224696

    Change-Id: I7f638751af0051a7006677b5fb3c9d9b9ef57da9