Azure VM not showing correct amount of CPU

Question

Hi, we have resized an Azure VM to D16s_v5. Now the Task Manager on the VM does only show 8 virtual processors instead of 16. Azure Portal is displaying it correctly. Does someone know why? thanks

Answer 1

Its related with

Mitigation for Transaction Asynchronous Abort vulnerability, Microarchitectural Data Sampling, Spectre, Meltdown, MMIO, Speculative Store Bypass Disable (SSBD), and L1 Terminal Fault (L1TF) with Hyper-Threading disabledreg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 8264 /f

Value 3 is default

https://support.microsoft.com/en-us/topic/kb4072698-windows-server-and-azure-stack-hci-guidance-to-protect-against-silicon-based-microarchitectural-and-speculative-execution-side-channel-vulnerabilities-2f965763-00e2-8f98-b632-0d96f30c8c8e

Answer 2

Make sure that, the Azure Guest Agent installed on the VM is updated to report the correct values of resources of the VM. Also, try a re-deployment of the VM so that to move the VM to a new node to refresh the resources and see if it helps to report the correct values of cpu - Redeploy Windows virtual machine to new Azure node

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