Huge performance drop in AIDA64 Memory&Cache Benchmark after Hyper-V was enabled in Windows 11

[nfsking2]

I got an Intel NUC8i7HVK (or known as Hades Canyon).

It came with an Intel i7 8809G CPU running at 4.5GHz (overclocked), 16GB*2 DDR4-3200 CL19 (overclocked).

I recently updated my system to Windows 11 and enabled the Hyper-V function which was required by Windows Subsystem for Android (WSA).

Then I found that the CPU and RAM speed was wrongly recognized by AIDA64. It reported that the CPU was running at around 1100MHz and RAM clock was about 600MHz (but Windows task manager still reported correct clock speed).

When running the Memory&Cache Benchmark, I could only managed to get about 6xxxMB/s read speed, 8xxxMB/s write speed and 7xxxMB/s copy speed, and the memory latency was high up to more than 380ns. The CPU cache speed was also much slower than it should be.

I tried to restore BIOS settings to default but with no help. As soon as I have disabled Hyper-V function in Windows Control Panel, AIDA64 could detect correct clock speed, and benchmark results were also back to normal.

I have another PC laptop which is based on AMD platform (5900HS, 40GB DDR4-3200). When Hyper-V was enabled and WSA installed on this PC, no any familiar issue occurred at all.

So I was confused, who is to be blamed for this issue? Microsoft, or Intel? Or it was just a bug from AIDA64?

[Fiery]

32 minutes ago, nfsking2 said:

I got an Intel NUC8i7HVK (or known as Hades Canyon).

It came with an Intel i7 8809G CPU running at 4.5GHz (overclocked), 16GB*2 DDR4-3200 CL19 (overclocked).

I recently updated my system to Windows 11 and enabled the Hyper-V function which was required by Windows Subsystem for Android (WSA).

Then I found that the CPU and RAM speed was wrongly recognized by AIDA64. It reported that the CPU was running at around 1100MHz and RAM clock was about 600MHz (but Windows task manager still reported correct clock speed).

When running the Memory&Cache Benchmark, I could only managed to get about 6xxxMB/s read speed, 8xxxMB/s write speed and 7xxxMB/s copy speed, and the memory latency was high up to more than 380ns. The CPU cache speed was also much slower than it should be.

I tried to restore BIOS settings to default but with no help. As soon as I have disabled Hyper-V function in Windows Control Panel, AIDA64 could detect correct clock speed, and benchmark results were also back to normal.

I have another PC laptop which is based on AMD platform (5900HS, 40GB DDR4-3200). When Hyper-V was enabled and WSA installed on this PC, no any familiar issue occurred at all.

So I was confused, who is to be blamed for this issue? Microsoft, or Intel? Or it was just a bug from AIDA64?

On certain Intel processors, before the Ice Lake and Rocket Lake era, suffer from this issue under Windows 11.  You need to disable Memory Integrity to get proper BCLK and CPU core clock measurement, as well as accurate benchmark results.  Even Intel's own tool (XTU) suffers from major issues under Windows 11, so it's definitely not a bug in AIDA64 but a serious limitation that Microsoft introduced in Windows 11.  One that causes headaches to both Intel and us.

AMD processors do not suffer such limitations under Windows 11, but there used to be other problems about them under Windows 11 that Microsoft resolved by now.

[nfsking2]

1 hour ago, Fiery said:

On certain Intel processors, before the Ice Lake and Rocket Lake era, suffer from this issue under Windows 11.  You need to disable Memory Integrity to get proper BCLK and CPU core clock measurement, as well as accurate benchmark results.  Even Intel's own tool (XTU) suffers from major issues under Windows 11, so it's definitely not a bug in AIDA64 but a serious limitation that Microsoft introduced in Windows 11.  One that causes headaches to both Intel and us.

AMD processors do not suffer such limitations under Windows 11, but there used to be other problems about them under Windows 11 that Microsoft resolved by now.

Thanks for your reply Fiery!

I have checked Memory Integrity setting in Windows Defender and it was disabled, but the problem still existed.

And the problems you mentioned on AMD processors, I think you meant high L3 latency which had been fixed by Microsoft recently?

[Fiery]

39 minutes ago, nfsking2 said:

Thanks for your reply Fiery!

I have checked Memory Integrity setting in Windows Defender and it was disabled, but the problem still existed.

And the problems you mentioned on AMD processors, I think you meant high L3 latency which had been fixed by Microsoft recently?

I probably should have stated that you need to have any virtualization and sandboxing disabled.  So under Win11 you need to disable both Memory Integrity and Hyper-V.

The high L3 latency issue should have been fixed already.

[newace]

I am having the same problem. 

my system : asrock z370 pro4 + i7 8700.

cpu clock is low when windows 11 hyper-v is on, it shows normally in windows 11 task manager.

Windows 10 Hyper-v on/off, Windows 11 Hyper-v off = no problem.

[Aleksandr]

what about memory integrity? what can i do to fix?

where can i search those parameters? 

thanks in advance

[ZiOLONwE]

So far not showing correctly?

[Asmodeus666]

Could you add a step-by-step guide how to switch Hyper-V and Memory Integrity on Windows 11? 

This thread is first in google searching for this issue.

[Asmodeus666]

Ah, it's not hard, I'll make it by myself:

 

Turning off Memory Integrity  
Select Start , enter ‘Core Isolation’ in the taskbar, and select Core Isolation from the list of results to open the Windows security app.

On the Core isolation page, turn off the toggle for Memory Integrity. You might need to restart your device.                               

Disabling Hyper-V by using Windows PowerShell

Open an elevated PowerShell window.

Run the following command:

Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V-Hypervisor

 

[evdmnt]

The command above doesn't disable Hyper-V completely. Use this guide to do so:

How to disable Hyper-V in Windows 11 (xda-developers.com)

 

Still no fix to low cache performance with Hyper-V enabled under Windows 11?