Hi,

You disabled "Count Threads As Cores" so you need extra steps to identify which cores you can pin.

You can check your CPU cores availability using the lscpu command, look:

# lscpu | grep -e NUMA -e ^CPU\(s\)

CPU(s):              72

NUMA node0 CPU(s):   0-17,36-53

NUMA node1 CPU(s):   18-35,54-71

The previous command lists physical cores and threads.

The following command shows you logical cores running on a physical core:

# grep -e "processor" -e "physical id" -e "core id" /proc/cpuinfo | grep -E -A1 -B1 "physical id.*0$" | grep -E -B 2 "core id.* 0$"

processor       : 0    <-- physical core 0 on socket 0

physical id     : 0

core id         : 0

--

processor       : 36   <-- second thread on physical core 0 on socket 0

physical id     : 0

core id         : 0

I hope it can help you troubleshoot your scenario.

Marcos

From: parallax <dd432690@gmail.com>
Sent: Sunday, July 28, 2024 6:25 AM
To: users <users@ovirt.org>
Subject: [External] : [ovirt-users] cpu pinning validation failed - virtual cpu does not exist in vm

server with two Gold 6346

this message appears when trying pin any cores after 14 core:

16#16_17#17_18#18_19#19_20#20_21#21_22#22

"cpu pinning validation failed - virtual cpu does not exist in vm"

"Count Threads As Cores" is disabled

pinning cores from 9 to 15 goes well 0#0_1#1_2#2_3#3_4#4_5#5_6#6_7#7_8#8_9#9_10#10_11#11