Laggy windows 11 VM on v8.3

[MrMagooo]

Hi All
I am a first time PROXMOX user and an experienced Hyper-v user.

My server is Proxmox 8.3 on a brand new Dell XR12 pizza box server with intel Gold 6346 CPU, DDR4 3200 memory 2 x Intel Flex140 GPU, 6 x Intel DC Sata drives in a raid 10 configuration, 4 x SFP+ 10g networking, installation and configuration went very smoothly

I have 4 x windows 11 VM's all with 1 GPU instance each 32g memory and 8CPU cores installed on this box, installation went very smoothly.

The VM's are laggy and feel like there running on outdated hardware, one of the programs we use accesses data over a network and it takes 5 seconds to load a record when normally it is instant,

We are accessing the VM via RDP connections on Dell 3000 thin clients or via Mac books, the VM's on our Hyper-v servers which are upto 7 years old are run smoothly with almost zero lag.

Any help would be appreciated as we do not have

Steve

 

[packetmonkey]

Am I reading correctly that you are assigned 8vcpus to each guest? Or do you have 8 cores on the proxmox host itself?

 

[_gabriel]

Windows 11 since 24h2 enable by default VBS which require hyperv if vCPU is host.
You can check if VBS is active from msinfo32.exe
Compare with Win11 23H2 or Win10.

 

[MrMagooo]

Am I reading correctly that you are assigned 8vcpus to each guest? Or do you have 8 cores on the proxmox host itself?

8 vCpu per vim a total of 32vpu on the cpu

 

[MrMagooo]

Windows 11 since 24h2 enable by default VBS which require hyperv if vCPU is host.
You can check if VBS is active from msinfo32.exe
Compare with Win11 23H2 or Win10.

Thanks you Gabriel I will have a look and see.

 

[packetmonkey]

8 vCpu per vim a total of 32vpu on the cpu

You can actually lower performance of a VM by assigning more vCPUs that needed. It doesn't necessarily explain your issue, but when you assign 8vCPUs to a guest, it will have to work to ensure CPU scheduling allows all 8 to be available at that time to use them. If you need 8vCPUs, great, but if you are just trying to increase performance, you might test with a lower amount of vCPUs to see if that will improve overall performance. There is likely a sweet spot in there that will better balance the workload.