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[Billy Olsen <2026284@xxxxxxxxxxxxxxxxxx>]

This does not appear to be a charm issue, but rather it appears to
potentially be a nova issue. I can confirm that setting the
rx_queue_size and tx_queue_size results in the nova.conf file being
updated by the charm, but that the resulting hard rebooted guest does
not get the tx_queue_size, only the rx_queue_size.


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

** Changed in: nova
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/2026284

Title:
  virtio-net-tx-queue-size reflects in nova conf but not for the vm even
  after a hard reboot

Status in OpenStack Nova Compute Charm:
  New
Status in OpenStack Compute (nova):
  Incomplete

Bug description:
  After modifying the nova compute config options,
  - virtio-net-rx-queue-size=512
  - virtio-net-tx-queue-size=512

  I hard rebooted my vm and spawned a new vm and what I see (on both of them) is:
  - virsh xml
  ```
  # virsh dumpxml 2 | grep -i queue
        <driver name='vhost' rx_queue_size='512'/>
  ```

  - nova.conf
  ```
  # grep -i queue /etc/nova/nova.conf
  tx_queue_size = 512
  rx_queue_size = 512
  ```

  - inside the vm
  ```
  root@jammy-135110:~# ethtool -g ens2
  Ring parameters for ens2:
  Pre-set maximums:
  RX:             512
  RX Mini:        n/a
  RX Jumbo:       n/a
  TX:             256
  Current hardware settings:
  RX:             512
  RX Mini:        n/a
  RX Jumbo:       n/a
  TX:             256
  ```

  The RX config gets propagated, but the TX config does not
  Please let me know if any more information is needed.

  ----------------------------------------------------------

  env:
  - focal ussuri
  - nova-compute:
      charm: nova-compute
      channel: ussuri/stable
      revision: 669
  - this is a freshly deployed openstack on vms (not on baremetal)
  - libvirt: 6.0.0-0ubuntu8.16
  - nova-compute-libvirt 21.2.4-0ubuntu2.5
  - qemu 4.2-3ubuntu6.27

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