ESXI Host Lost Logical Processors after Patches

[insearchof]

VMware 6.5 U2

My ESXI hosts are Dell PowerEdge  R430 Gen 13

Intel(R) Xeon(R) CPU E5-2623 v3 @ 3.00GHz

All servers have 1x quad core CPU installed (8 threads)

On my ESXI Hosts I got a warning

Warning “esx.problem.hyperthreading.unmitigated” after installing ESXi patches

The article I found

Warning “esx.problem.hyperthreading.unmitigated” after installing ESXi patches. | Kalle's playground

I went to configuration then advanced settings

changed

"VMkernel.Boot.hyperthreadingMitigation”
to “true”

After restart my Logical Processors went from 8 to 4

Any thoughts?

Thank you

Tom

[a_p_]

That's the expected bahaviour.

From https://kb.vmware.com/s/article/55806​

Enabling this option will result in the vSphere UI reporting only a single logical processor per physical core; halving the number of logical processors if Hyperthreading was previously enabled. In addition Hyperthreading may be reported as 'Disabled' in various configuration tabs.

In case you just wanted to suppress the message, but leave things as is, follow https://kb.vmware.com/s/article/57374​

André

[insearchof]

a.p.

thanks for the links

I see that tell you to upgrade the vcenter also I forgot about that

I just upgraded my vcenter to 6.5.0.30000 Build Number 14020092

After that should I change the  "VMkernel.Boot.hyperthreadingMitigation”
to “false”    it is true now.

Thanks

[birend1988 · Accepted solution]

Yes, that is correct. And you can suppress the warning.