MejdiB opened a new issue, #6914:
URL: https://github.com/apache/cloudstack/issues/6914
##### ISSUE TYPE
<!-- Pick one below and delete the rest -->
* Bug Report
* Improvement Request
##### COMPONENT NAME
~~~
Agent
~~~
##### CLOUDSTACK VERSION
~~~
4.17.1
~~~
##### CONFIGURATION
Cloudstack 4.17.1 Environment Advanced Zone with Security Groups. One
Computing Cluster consists of AMD EPYC CPUs based on Rome Architecture
##### OS / ENVIRONMENT
RHEL 8 is used for cloudstack management servers and hosts.
##### SUMMARY
With version 4.17, Cloudstack seems to derive the cpu frequency from `virsh
capabilites` (https://github.com/apache/cloudstack/issues/6680). With the new
update, we experience strange behavior across our CPU hosts based on AMD EPYC
Rome CPUs. A lot of hosts are marked "unavailable", due to differences in the
CPU frequency:
Example output Host A:
~~~
<host>
<uuid>948dfa00-7553-11eb-8000-ac1f6b365290</uuid>
<cpu>
<arch>x86_64</arch>
<model>EPYC-Rome</model>
<vendor>AMD</vendor>
<microcode version='137367629'/>
<counter name='tsc' frequency='2800000000'/>
<topology sockets='1' dies='1' cores='24' threads='2'/>
~~~
Example output Host B (not available for VMs):
~~~
<host>
<uuid>34d92400-753e-11eb-8000-ac1f6b3675d4</uuid>
<cpu>
<arch>x86_64</arch>
<model>EPYC-Rome</model>
<vendor>AMD</vendor>
<microcode version='137367629'/>
<counter name='tsc' **frequency='2799999000'/**>
<topology sockets='1' dies='1' cores='24' threads='2'/>
~~~
Starting a VM on Host B would result in the following error:
~~~
2022-11-17 16:33:06,369 INFO [utils.linux.KVMHostInfo]
(Agent-Handler-1:null) (logid:) Fetching CPU speed from "host capabilities"
2022-11-17 16:33:06,375 INFO [utils.linux.KVMHostInfo]
(Agent-Handler-1:null) (logid:) Retrieved value [2799999000] from "host
capabilities". This corresponds to a CPU speed of [2799] MHz.
~~~
lscpu, however, displays the value of 2800 MHz on all hosts:
~~~
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 96
On-line CPU(s) list: 0-95
Thread(s) per core: 2
Core(s) per socket: 24
Socket(s): 2
NUMA node(s): 2
Vendor ID: AuthenticAMD
~~~
BIOS Vendor ID: Advanced Micro Devices, Inc.
CPU family: 23
Model: 49
Model name: AMD EPYC 7402 24-Core Processor
BIOS Model name: AMD EPYC 7402 24-Core Processor
Stepping: 0
CPU MHz: 3345.701
CPU max MHz: 2800,0000
CPU min MHz: 1500,0000
BogoMIPS: 5600.24
Virtualization: AMD-V
L1d cache: 32K
~~~
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