topic Re: ESXI Host Lost Logical Processors after Patches in VMware vCenter™ Discussions

ESXI Host Lost Logical Processors after Patches

insearchof — Sun, 25 Aug 2019 20:00:24 GMT

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

Re: ESXI Host Lost Logical Processors after Patches

a_p_ — Sun, 25 Aug 2019 20:48:25 GMT

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

Re: ESXI Host Lost Logical Processors after Patches

insearchof — Tue, 27 Aug 2019 00:45:13 GMT

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

Re: ESXI Host Lost Logical Processors after Patches

birend1988 — Tue, 27 Aug 2019 01:13:41 GMT

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