ConnectX3 10g PCIe performance on Linux Debian 9 Guest, Windows 10 Host

I want to create a local 10g connection between my primary workstation (Windows 10 host Debian 9 guest) and a local native Debian 9 distributed build server. Since Mellanox ConnectX3 cards are now supported in Debian 9 http://www.mellanox.com/page/mlnx_ofed_matrix?mtag=linux_sw_drivers , I thought I could just pick up a pair of MCX311As, connect them back-to-back, et voila, the network would no longer be my bottleneck. https://forums.virtualbox.org/images/smilies/icon_smile.gif

Before I dive in, I am attempting to prognosticate the real world throughput I’ll get (given both cards are installed in appropriate PCIe slots with adequate lanes and I use a good cable) on the Debian 9 guest running under VirtualBox. Can anyone provide any information on this matter?

Thank you!

p.s. I posted something similar on the Virtualbox forum: virtualbox.org • View topic - 10g (Mellanox) PCIe performance on Linux Debian 9 Guest, Windows 10 Host https://forums.virtualbox.org/viewtopic.php?f=6&t=86656

I forgot that Virtualbox only presents generic interfaces to its guests (and doesn’t support any 10g interfaces per se), so the mellanox drivers will only work for me, as I intend to use the hardware, on a native debian host. I think i’m just going to flip OSes on my main workstation so it’s debian host (where i do most my work anyway) and win10 guest.