Poor Performance of CPU & Memory in VM

[Styx]

Hi there,

 

I ran "AIDA64 Cache & Memory Benchmark" in the Win10 installed in the VM. The benchmark result shows a very poor read / write performance of Memory and Cache (see attached). The CPU Clock and FSB are also very low.

 

Is there any way to tune up the performance?

 

Host Configuration:

CPU: E5-2650v2, 2.6G
Memory: 64G DDR3 1600MHz

Intel VT-x: Enabled

 

VM Configuration:

CPU: Host Passthrough, 2 cores, 4 threads

Memory: 8G

Machine: i440fx-5.1

BIOS: SeaBIOS

Hyper-V: Yes

Disk: 30GB on SSD

[dqmhug]

I have the same problem when I use cpu-passthrough on qemu.

 

Latency and read write seems way better when I use host-cpu on qemu or vmware.

 

I don't see any noticable difference on other benchmarks than AIDA64 though.

[zaker]

I think this has to do with IoMmu

https://docs.microsoft.com/en-us/windows-hardware/drivers/display/iommu-model

still learning myself...