Windows 10 Hyper V using PXE is slow

ComputerHabit 781 Reputation points
2022-04-19T16:36:06.233+00:00

I'm trying to get SCCM's OSD working with Hyper-V clients. PXE works just fine from other systems but this is slow from the start. If I boot up a VM and test speed it is fast.

This is slow at the beginning when downloading the boot.wim file. I don't think drivers added to SCCM would fix anything at this part.

I've been searching for days now and can't find what I could modify to get PXE working better.

PS
Holy crap please someone fix the the tagging. It really is terrible.

Hyper-V
Hyper-V
A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
2,530 questions
Microsoft Configuration Manager Deployment
Microsoft Configuration Manager Deployment
Microsoft Configuration Manager: An integrated solution for for managing large groups of personal computers and servers.Deployment: The process of delivering, assembling, and maintaining a particular version of a software system at a site.
897 questions
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4 answers

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  1. Pavel yannara Mirochnitchenko 11,616 Reputation points
    2022-04-19T17:53:23.823+00:00

    You can try to change this value (I do it for 8192) but it might not be supported officially

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SMS\DP

    RamDiskTFTPBlockSize

    REG_DWORD

    16384

  2. Pavel yannara Mirochnitchenko 11,616 Reputation points
    2022-04-19T18:03:29.843+00:00

    How about if you forget about VM and try it on a physical machine? Other way is to change between Gen1 and Gen2, add second vCpu to it.

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  3. AllenLiu-MSFT 40,076 Reputation points Microsoft Vendor
    2022-04-20T06:25:57.067+00:00

    Hi, @ComputerHabit

    Thank you for posting in Microsoft Q&A forum.

    Agree with you, it should not related to drivers.
    It may related to the OS that host the hyper-v, have we tried to test it with other OS that host hyper-v?

    You may check Gerry Hampson's answer at the end of below thread:
    https://social.technet.microsoft.com/Forums/windows/en-US/6aad66ee-6fde-4b52-9aa7-b77a469719ba/slow-pxe-booting-on-hyperv-vm?forum=configmanagerosd

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  4. ComputerHabit 781 Reputation points
    2022-04-25T12:41:13.377+00:00

    PXE is slow. I don't know why. After the hour it takes to download it works fine.

    I'm remote so I'm waiting for some test results from local staff but I'm pretty sure it's just Hyper-V being slow.

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