yahoo-eng-team team mailing list archive

[sean mooney <smooney@xxxxxxxxxx>]

Public bug reported:

When multiqueue support was introduced for vhost-user it reuesed the
same code to calculate the queue count as kernel vhost.

In https://bugs.launchpad.net/nova/+bug/1570631 and commit
https://review.opendev.org/#/c/332660/, a bug was fixed by making the
assumption that the kernel version should also dictate the max number of
queues on the tap interface when setting hw:vif_multiqueue_enabled=True.

this change did not take account of the fact that this was shared code and incorrectly applied
the hard coded kernel limits to vhost-user interface not just tap devices.

** Affects: nova
     Importance: Low
     Assignee: sean mooney (sean-k-mooney)
         Status: Triaged

** Affects: nova/queens
     Importance: Low
         Status: Triaged

** Affects: nova/rocky
     Importance: Low
         Status: Triaged

** Affects: nova/stein
     Importance: Low
         Status: Triaged

** Affects: nova/train
     Importance: Low
         Status: Triaged

** Affects: nova/ussuri
     Importance: Low
     Assignee: sean mooney (sean-k-mooney)
         Status: Triaged


** Tags: dpdk libvirt

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Also affects: nova/queens
   Importance: Undecided
       Status: New

** Also affects: nova/ussuri
   Importance: Low
     Assignee: sean mooney (sean-k-mooney)
       Status: Triaged

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Also affects: nova/stein
   Importance: Undecided
       Status: New

** Changed in: nova/stein
   Importance: Undecided => Low

** Changed in: nova/stein
       Status: New => Triaged

** Changed in: nova/rocky
       Status: New => Triaged

** Changed in: nova/rocky
   Importance: Undecided => Low

** Changed in: nova/queens
       Status: New => Triaged

** Changed in: nova/queens
   Importance: Undecided => Low

** Changed in: nova/train
       Status: New => Triaged

** Changed in: nova/train
   Importance: Undecided => Low

** Bug watch added: Red Hat Bugzilla #1714075
   https://bugzilla.redhat.com/show_bug.cgi?id=1714075

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https://bugs.launchpad.net/bugs/1858102

Title:
  multiqueue vhostuser interface should not have kernel limits applied

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) queens series:
  Triaged
Status in OpenStack Compute (nova) rocky series:
  Triaged
Status in OpenStack Compute (nova) stein series:
  Triaged
Status in OpenStack Compute (nova) train series:
  Triaged
Status in OpenStack Compute (nova) ussuri series:
  Triaged

Bug description:
  When multiqueue support was introduced for vhost-user it reuesed the
  same code to calculate the queue count as kernel vhost.

  In https://bugs.launchpad.net/nova/+bug/1570631 and commit
  https://review.opendev.org/#/c/332660/, a bug was fixed by making the
  assumption that the kernel version should also dictate the max number
  of queues on the tap interface when setting
  hw:vif_multiqueue_enabled=True.

  this change did not take account of the fact that this was shared code and incorrectly applied
  the hard coded kernel limits to vhost-user interface not just tap devices.

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