Windows 10: Hyper-V Causes Extreme Degradation of Performance on WiFi

Discus and support Hyper-V Causes Extreme Degradation of Performance on WiFi in Windows 10 Virtualization to solve the problem; I have a machine that is in a temporary location. The location makes it necessary to also temporarily connect using WiFi. As a result, I have a USB... Discussion in 'Windows 10 Virtualization' started by hsehestedt, Nov 7, 2020.

  1. HSEHESTEDT
    hsehestedt Win User

    Hyper-V Causes Extreme Degradation of Performance on WiFi


    I have a machine that is in a temporary location. The location makes it necessary to also temporarily connect using WiFi. As a result, I have a USB based WiFi 5 adapter connected to this machine. I'm moving large amounts of data to the machine but I'm getting an amazingly great 100MB+ per second over the WiFi connection.

    I enabled Hyper-V on this system and my WiFi performance plummeted to around 30 to 35MB / sec. Just to make sure that is was really Hyper-V that was responsible for this, I uninstalled Hyper-V and my performance is back up to 100MB+ / sec.

    Anyone know if such drastic drops in performance are expected or if there is any sort of "tuning" that can be done to alter this behavior?

    System Details:

    MSI X570-A Pro Motherboard
    AMD Ryzen 3900X CPU
    32B RAM
    Samsung 970 EVO NVMe 500GB SSD (Windows / Application Installation Disk)
    Western Digital WD100EMAZ 10TB HD (This is where all the data I am copying is being stored)
    WiFi Adapter: USB 3 Netgear Nighthawk A7000 (AC1900 WiFi 5 adapter)
    WiFi Router - ASUS RT-AX92U Router (WiFi 6)

    EDIT: Forgot one important detail: This system is running Win 10 Pro 20H2

    :)
     
    hsehestedt, Nov 7, 2020
    #1
  2. NAVYLCDR
    NavyLCDR Win User

    Hyper-V Causes Extreme Degradation of Performance on WiFi

    I notice a large drop in network performance if I have an external switch set up in Hyper-V. I don't notice any performance decrease with an internal switch set up.

    Internal Switch:

    Hyper-V Causes Extreme Degradation of Performance on WiFi [​IMG]


    External Switch:

    Hyper-V Causes Extreme Degradation of Performance on WiFi [​IMG]


    This test is done from the host.
     
    NavyLCDR, Nov 7, 2020
    #2
  3. BREE
    Bree Win User
    Hyper-V Causes Extreme Degradation of Performance on WiFi

    One of my Hyper-V machines has 20H2. I use WiFi for all my machines, and can't say I've noticed the Hyper-V machines being significantly slower than those without.

    So I tested the speed on the 20H2 machine with and without Hyper-V installed. For the test I copied the same file from my network storage each time. Yes, with Hyper-V it was a little slower, but not dramatically so - 130Mbps vs 150Mbps.


    Hyper-V installed


    Hyper-V Causes Extreme Degradation of Performance on WiFi [​IMG]



    Hyper-V unistalled


    Hyper-V Causes Extreme Degradation of Performance on WiFi [​IMG]
     
    Bree, Nov 7, 2020
    #3
  4. HSEHESTEDT
    hsehestedt Win User

    Hyper-V Causes Extreme Degradation of Performance on WiFi

    Hyper-V Causes Extreme Degradation of Performance on WiFi

    I have a machine that is in a temporary location. The location makes it necessary to also temporarily connect using WiFi. As a result, I have a USB based WiFi 5 adapter connected to this machine. I'm moving large amounts of data to the machine but I'm getting an amazingly great 100MB+ per second over the WiFi connection.

    I enabled Hyper-V on this system and my WiFi performance plummeted to around 30 to 35MB / sec. Just to make sure that is was really Hyper-V that was responsible for this, I uninstalled Hyper-V and my performance is back up to 100MB+ / sec.

    Anyone know if such drastic drops in performance are expected or if there is any sort of "tuning" that can be done to alter this behavior?

    System Details:

    MSI X570-A Pro Motherboard
    AMD Ryzen 3900X CPU
    32B RAM
    Samsung 970 EVO NVMe 500GB SSD (Windows / Application Installation Disk)
    Western Digital WD100EMAZ 10TB HD (This is where all the data I am copying is being stored)
    WiFi Adapter: USB 3 Netgear Nighthawk A7000 (AC1900 WiFi 5 adapter)
    WiFi Router - ASUS RT-AX92U Router (WiFi 6)

    EDIT: Forgot one important detail: This system is running Win 10 Pro 20H2
     
    hsehestedt, Nov 7, 2020
    #4
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Hyper-V Causes Extreme Degradation of Performance on WiFi

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