Windows 10 Hyper V using PXE is slow

Question

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.

Answer 1

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

Answer 2

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.

Answer 3

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

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 4

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.