openstack/devstack
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[nova] Add flag to set libvirt tb_cache_size

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A config option is being added in nova with [1]
in order to allow configuring lower tb-cache size
for qemu guest VMs.

This patch adds a flag in devstack so jobs can
utilize it to set required tb-cache size.

[1] https://review.opendev.org/c/openstack/nova/+/868419

Co-Authored-By: Sean Mooney <work@seanmooney.info>
Related: blueprint libvirt-tb-cache-size
Change-Id: Ifde737eb5d87dfe860445097d1f2b0ce16b0de05
This commit is contained in:
yatinkarel 2023-04-26 14:59:25 +00:00 committed by Sean Mooney
parent db305d2a4b
commit c707dd3fc2
2 changed files with 12 additions and 12 deletions
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18
.zuul.yaml
View File

@ -544,17 +544,15 @@
# increase in swap performance by reducing the amount of data
# written to disk. the overall speedup is proportional to the
# compression ratio and the speed of the swap device.
# NOTE: this option is ignored when not using nova with the libvirt
# virt driver.
NOVA_LIBVIRT_TB_CACHE_SIZE: 128
ENABLE_ZSWAP: true
devstack_local_conf:
post-config:
$NEUTRON_CONF:
DEFAULT:
global_physnet_mtu: '{{ external_bridge_mtu }}'
$NOVA_CPU_CONF:
libvirt:
# Use lower TB cache than default(1GiB), only applicable with
# libvirt>=8.0.0
tb_cache_size: 128
devstack_services:
# Core services enabled for this branch.
# This list replaces the test-matrix.
@ -659,13 +657,9 @@
# written to disk. the overall speedup is porportional to the
# compression ratio and the speed of the swap device.
ENABLE_ZSWAP: true
devstack_local_conf:
post-config:
$NOVA_CPU_CONF:
libvirt:
# Use lower TB cache than default(1GiB), only applicable with
# libvirt>=8.0.0
tb_cache_size: 128
# NOTE: this option is ignored when not using nova with the libvirt
# virt driver.
NOVA_LIBVIRT_TB_CACHE_SIZE: 128
- job:
name: devstack-ipv6

6
lib/nova
View File

@ -173,6 +173,9 @@ NOVA_SHUTDOWN_TIMEOUT=${NOVA_SHUTDOWN_TIMEOUT:-0}
# Whether to use Keystone unified limits instead of legacy quota limits.
NOVA_USE_UNIFIED_LIMITS=$(trueorfalse False NOVA_USE_UNIFIED_LIMITS)
# TB Cache Size in MiB for qemu guests
NOVA_LIBVIRT_TB_CACHE_SIZE=${NOVA_LIBVIRT_TB_CACHE_SIZE:-0}
# Functions
# ---------
@ -1071,6 +1074,9 @@ function start_nova_compute {
fi
if [[ "$VIRT_DRIVER" = 'libvirt' ]]; then
if [ ${NOVA_LIBVIRT_TB_CACHE_SIZE} -gt 0 ]; then
iniset $NOVA_CPU_CONF libvirt tb_cache_size ${NOVA_LIBVIRT_TB_CACHE_SIZE}
fi
# The group **$LIBVIRT_GROUP** is added to the current user in this script.
# ``sg`` is used in run_process to execute nova-compute as a member of the
# **$LIBVIRT_GROUP** group.