Hi

I know this subject has been spoke all over, and yet, I still have some hard issues with PXE Boot speed in my environment.

a little background:

SCCM 2012 R2 SP1 Primary Site, Windows Server 2012, 24GB, Local SQL 2012 SP1, Virtual Machine on VMWare

when I try to deploy an image from PXE the boot image (Which is 400 something MBs) takes about 2 minutes to load on any hardware.

so what I did so far:

• ramdisktftpblocksize=16384
• RamDiskTFTPWindowSize=8
• Disable Jumbo Packets
• Changed from vmxnet3 to E1000
• Change receive and send transfers to 2048

I was sure the problem is network related so I also tried to boot from a VM on the same vLan with the SCCM server to isolate any switches on the way - and the result was the same...

I Still haven't tried this one. I was wondering if anyone here tried it and give feedback
http://sccmzone.ro/window-size-dll-patch

besides. are there any clear statements about the right configuration for PXE on VMWare?

I don't specifically know what your problem is but I was able to solve a similar problem on a customer site in the past. It was a similar situation in that network speed was poor (but only in Windows PE). I realised that the customer had Cisco switches that were configured to use 100Mb Full duplex. The default behaviour of most NIC drivers is Auto and this was what was being executed in Windows PE. The speed mismatch caused performance issues.

I edited the NIC driver inf file so that the default behaviour was 100Mb Full and this solved the problem.

This was a very isolated case and I haven't seen anything similar since.

Hi Gerry.

what you mentioned is a nice idea... but it address another issue

my issue is that the PXE Boot time, not the wim download time

2 minutes for only 400MBs means the speed is approximately 3 Mbps. according to my knowledge - this is not that normal.

and as I said I booted from a VM machine in the same vLan with my SCCM Server, so there are no switches in between and it still 2 minutes.

I tried to create another boot image but same result. seems like the TFTP protocol doesn't download fast as it should and I try to search how to optimize it, when can I check...?

again, applying the .wim is not that bad. a couple of minutes for 8GBs. it's only the PXE issue

hi Guys

still hope to get some ideas...