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[Lee Yarwood <1949606@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

This is a Nova tracker for a set of issues being seen in OpenStack CI
jobs using QEMU >= 5.0.0 caused by the following change in defaults
witin QEMU:

https://github.com/qemu/qemu/commit/600e17b26

https://gitlab.com/qemu-project/qemu/-/issues/693

At present most of the impacted jobs are being given an increased amount
of swap with lower Tempest concurrency settings to avoid the issue, for
example for CentOS 8 stream:

https://review.opendev.org/c/openstack/devstack/+/803706

https://review.opendev.org/c/openstack/tempest/+/797614

Longer term a libvirt RFE has been raised to allow Nova to control the
size of the cache:

https://gitlab.com/libvirt/libvirt/-/issues/229

** Affects: nova
     Importance: Undecided
     Assignee: Lee Yarwood (lyarwood)
         Status: New


** Tags: gate-failure

** Description changed:

  This is a Nova tracker for a set of issues being seen in OpenStack CI
  jobs using QEMU >= 5.0.0 caused by the following change in defaults
  witin QEMU:
  
  https://github.com/qemu/qemu/commit/600e17b26
  
  https://gitlab.com/qemu-project/qemu/-/issues/693
  
  At present most of the impacted jobs are being given an increased amount
- of swap with Tempest concurrency settings to avoid the issue, for
+ of swap with lower Tempest concurrency settings to avoid the issue, for
  example for CentOS 8 stream:
  
  https://review.opendev.org/c/openstack/devstack/+/803706
  
  https://review.opendev.org/c/openstack/tempest/+/797614
  
  Longer term a libvirt RFE has been raised to allow Nova to control the
  size of the cache:
  
  https://gitlab.com/libvirt/libvirt/-/issues/229

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https://bugs.launchpad.net/bugs/1949606

Title:
  QEMU >= 5.0.0 with -accel tcg uses a tb-size of 1GB  causing OOM
  issues in CI

Status in OpenStack Compute (nova):
  New

Bug description:
  This is a Nova tracker for a set of issues being seen in OpenStack CI
  jobs using QEMU >= 5.0.0 caused by the following change in defaults
  witin QEMU:

  https://github.com/qemu/qemu/commit/600e17b26

  https://gitlab.com/qemu-project/qemu/-/issues/693

  At present most of the impacted jobs are being given an increased
  amount of swap with lower Tempest concurrency settings to avoid the
  issue, for example for CentOS 8 stream:

  https://review.opendev.org/c/openstack/devstack/+/803706

  https://review.opendev.org/c/openstack/tempest/+/797614

  Longer term a libvirt RFE has been raised to allow Nova to control the
  size of the cache:

  https://gitlab.com/libvirt/libvirt/-/issues/229

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