openstack
/
nova
Code Issues Proposed changes

Lower num_pcie_ports to 12 in the nova-next job 

This change is being proposed in response to guest kernel panics that
are happening occasionally in the nova-next CI job. In these particular
cases, we see messages like the following in the guest console log dump
[1]:

  pci 0000:00:03.6: BAR 13: no space for [io  size 0x1000]
  pci 0000:00:03.6: BAR 13: failed to assign [io  size 0x1000]

which seems to indicate the guest is running out of memory to allocate
to the pcie devices.

This lowers num_pcie_ports to 12 from 24 in an effort to use less
memory.

[1] https://pastebin.com/raw/cVDem0Xr

Change-Id: Ibfa65a00dd91e6c3f28fef837a7e172221f72f42
This commit is contained in:
melanie witt 2023-11-29 17:11:18 +00:00
parent 1738b52c30
commit 283eece679
1 changed files with 1 additions and 1 deletions
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2
.zuul.yaml
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@ -411,7 +411,7 @@
libvirt:
# Increase the number of PCIe ports per instance given the q35
# machine type attaches more devices by default than pc
num_pcie_ports: 24
num_pcie_ports: 12
hw_machine_type: "x86_64=q35"
# Use lower TB cache than default(1GiB), only applicable with
# libvirt>=8.0.0