[vbox-dev] networking outbound is slower then inbound

Geoff Nordli geoffn at gnaa.net
Wed May 18 18:12:44 UTC 2016


Really happy with the network performance boost with vbox5!!  Really 
900Mbps over a virtualized network is pretty good.

One thing I notice that the outbound is slower than the inbound. Any 
suggested tweak to get the same throughput?

The configuration:

Vbox 5.0.20
Virtual Machine:  Windows 2012 R2 with the 82540EM network card.

Client:  Windows 7 on physical hardware connected via 1Gbps switch.

Using the latest iperf tests, with default options.

Client -> VM  903Mbps
VM -> Client  572Mbps



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