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Hi,,

I am having trouble with my compute node that nova-compute and ovs process
are being killed by OOM. I have alot memory available in system.

# free -g
              total        used        free      shared  buff/cache
available
Mem:           1006         121         881           0           2
879
Swap:             7           0           7

But I am seeing process are being killed in dmesg.

[Sat Feb 19 03:46:26 2022] Memory cgroup out of memory: Killed process
2080898 (ovs-vswitchd) total-vm:9474284kB, anon-rss:1076384kB,
file-rss:11700kB, shmem-rss:0kB, UID:0 pgtables:2776kB oom_score_adj:0
[Sat Feb 19 03:47:01 2022] Memory cgroup out of memory: Killed process
2081218 (ovs-vswitchd) total-vm:9475332kB, anon-rss:1096988kB,
file-rss:11700kB, shmem-rss:0kB, UID:0 pgtables:2780kB oom_score_adj:0
[Sat Feb 19 03:47:06 2022] Memory cgroup out of memory: Killed process
2081616 (ovs-vswitchd) total-vm:9473252kB, anon-rss:1073052kB,
file-rss:11700kB, shmem-rss:0kB, UID:0 pgtables:2784kB oom_score_adj:0
[Sat Feb 19 03:47:16 2022] Memory cgroup out of memory: Killed process
2081940 (ovs-vswitchd) total-vm:9471236kB, anon-rss:1070920kB,
file-rss:11700kB, shmem-rss:0kB, UID:0 pgtables:2776kB oom_score_adj:0
[Sat Feb 19 03:47:16 2022] Memory cgroup out of memory: Killed process 6098
(nova-compute) total-vm:3428356kB, anon-rss:279920kB, file-rss:9868kB,
shmem-rss:0kB, UID:64060 pgtables:1020kB oom_score_adj:0
[Mon Feb 21 11:15:08 2022] Memory cgroup out of memory: Killed process
2082296 (ovs-vswitchd) total-vm:9475372kB, anon-rss:1162636kB,
file-rss:11700kB, shmem-rss:0kB, UID:0 pgtables:2864kB oom_score_adj:0

Any advice on how to fix this ? Also any best practices document on
configuring memory optimizations in nova compute node.

Ammad
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