WDS TFTP Maximum Block Size and Variable Window Extension

This is a quick post to show the performance benefits of TFTP block sizes and Variable Window Extensions. Please note that my tests were brief and not scientific at all but the results were good enough for me! 🙂

Our WDS server is running on a 2012 R2 VM. Client connected via ethernet cable and PXE booting over UEFI.

The boot image was about 1.6GB in size and I timed the tests from the moment the image started loading to the moment the screen went black (so basically the entire image download)