P2V and Hyper-V (Physical to Virtual) Lousy performance ?


jimbo45

jimbo45

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Hi folks
Creating a VM from a physical image and then running under HYPER-V seemed to offer really lousy performance. Hyper-V usually pretty good IMHO.

I created the VM by making a disk image via Macrium of the physical system, then making a VM in Hyper-V with an empty "virtual disk" by booting a stand alone Macrium iso image in the VM and restoring the copied image. Reduced the memory size to 16GB (Host machine has 32GB but 16GB should be perfectly adequate for a Windows VM), and left as 4 Virtual CPU's.

OK the physical image will have a load more drivers in it (which won't be used in the VM) but I expected the performance to be a lot better -- Host was W11 Enterprise - 25H2 Canary latest build, VM was W11 Pro insider preview 25H2. Virtual disk was a single vhdx disk - plenty of space.

This method has worked OK in the past -- nothing wrong with the NATIVE performance of either of these systems - Any ideas if its W11 Canary before I try the same thing on W11 DEV or Beta.

Cheers
jimbo
 

My Computer

System One

  • OS
    Windows XP,11 Linux Fedora Rawhide pre-release 45
    Computer type
    PC/Desktop
    CPU
    2 X Intel i7
    Screen Resolution
    4KUHD X 2
jimbo45 said:
Hi folks
Creating a VM from a physical image and then running under HYPER-V seemed to offer really lousy performance. Hyper-V usually pretty good IMHO.

I created the VM by making a disk image via Macrium of the physical system, then making a VM in Hyper-V with an empty "virtual disk" by booting a stand alone Macrium iso image in the VM and restoring the copied image. Reduced the memory size to 16GB (Host machine has 32GB but 16GB should be perfectly adequate for a Windows VM), and left as 4 Virtual CPU's.

OK the physical image will have a load more drivers in it (which won't be used in the VM) but I expected the performance to be a lot better -- Host was W11 Enterprise - 25H2 Canary latest build, VM was W11 Pro insider preview 25H2. Virtual disk was a single vhdx disk - plenty of space.

This method has worked OK in the past -- nothing wrong with the NATIVE performance of either of these systems - Any ideas if its W11 Canary before I try the same thing on W11 DEV or Beta.

Cheers
jimbo
Click to expand...
Sometimes you need to use the Reflect iso "fix windows boot problems".

I have a related issue where cloned vm would no boot unless secure boot was switched off.

Have you tried viboot?
 

My Computer

System One

  • OS
    Windows 11 Pro + Win11 Canary VM.
    Computer type
    Laptop
    Manufacturer/Model
    ASUS Zenbook 14
    CPU
    I9 13th gen i9-13900H 2.60 GHZ
    Motherboard
    Yep, Laptop has one.
    Memory
    16 GB soldered
    Graphics Card(s)
    Integrated Intel Iris XE
    Sound Card
    Realtek built in
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    laptop OLED screen
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    2880x1800 touchscreen
    Hard Drives
    1 TB NVME SSD (only weakness is only one slot)
    PSU
    Internal + 65W thunderbolt USB4 charger
    Case
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    Keyboard
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    Bluetooth , wireless dongled, wired
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    900 mbs (ethernet), wifi 6 typical 350-450 mb/s both up and down
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    Defender
    Other Info
    TPM 2.0, 2xUSB4 thunderbolt, 1xUsb3 (usb a), 1xUsb-c, hdmi out, 3.5 mm audio out/in combo, ASUS backlit trackpad (inc. switchable number pad)

    Macrium Reflect Home V8
    Office 365 Family (6 users each 1TB onedrive space)
    Hyper-V (a vm runs almost as fast as my older laptop)
cereberus said:
Sometimes you need to use the Reflect iso "fix windows boot problems".

I have a related issue where cloned vm would no boot unless secure boot was switched off.

Have you tried viboot?
Click to expand...
Hi there
I'll have a go with that -- I've also just got when the VM is re-booting a load of "Updates are underway" so I'll see what happens. Usually creating a VM from a physical image isn't a problem - unless you have really eseoteric hardware or try to run some applications that rely on accessing native hardware rather than the "paravirtualised" hardware.

Going the OTHER way i.e creating a Physical machine from the Virtual image (V2P) is a bigger problem although these days so long as the system boots with Ms basic video driver, a NIC and you've got access to driver files and Windows updates Windows is pretty good.

I'm not using bit locker or any device encryption stuff.

Cheers
jimbo
 

My Computer

System One

  • OS
    Windows XP,11 Linux Fedora Rawhide pre-release 45
    Computer type
    PC/Desktop
    CPU
    2 X Intel i7
    Screen Resolution
    4KUHD X 2
Hi there
@cereberus

Problem found - somehow the VM wanted the physical graphics card but couldn't find it so every command was taking an age !! -- in the VM analysis -- no GPU !! Anyway sorted out and its working fine -- Went back to the physical machine, removed i.e unistalled the UHD Intel video driver - so just had basic Ms video adapter - re-created the VM - and then did Windows update where it got the video driver with the correct settings from HYPER-V and its working properly now.

Screenshot 2025-09-29 132802.webp

Cheers
jimbo
 
Last edited:

My Computer

System One

  • OS
    Windows XP,11 Linux Fedora Rawhide pre-release 45
    Computer type
    PC/Desktop
    CPU
    2 X Intel i7
    Screen Resolution
    4KUHD X 2
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