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Re: Windows users! Help us test upload performance tuning?

From: Andy Pont <>
Date: Mon, 06 Aug 2018 12:32:21 +0000

Daniel wrote...

>Ok, so I installed Win 10 on Virtualbox 5.2.16 on my machine and I can
>confirm Jan's findings; in NAT mode the ideal backlog stays flat at 64
>KB, and the patch provides no benefits.
>Once I switched to "Bridged adapter", I got normal results (as in,
>similar to what other people reported):
Looking at the source code for VirtualBox it appears that the NAT mode
is built on top of lwIP 1.4.1 so the limitation may come from there.

I chat with the VirtualBox devs on IRC from time to time and am happy to
ask them specific questions if it would help.


Received on 2018-08-06