A small report on two different versions of Vyatta (6.3 and 6.5r1) with (outdated) but official VMware tools perform using iperf with default settings. We changed the MTU the second time and achieved our 10Gb/sec.

vyatta@jeff# sudo iperf -c 192.168.1.245 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.1.245, TCP port 5001
TCP window size:   140 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.241 port 35764 connected with 192.168.1.245 port 5001
[  5] local 192.168.1.241 port 5001 connected with 192.168.1.245 port 47655
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  7.13 GBytes  6.12 Gbits/sec
[  5]  0.0-10.0 sec  6.94 GBytes  5.97 Gbits/sec

vyatta@jeff# set interfaces ethernet eth5 mtu 9000
vyatta@jeff# commit
vyatta@jeff# sudo iperf -c 192.168.1.245 -d
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.1.245, TCP port 5001
TCP window size:   442 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.241 port 59688 connected with 192.168.1.245 port 5001
[  5] local 192.168.1.241 port 5001 connected with 192.168.1.245 port 54768
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  12.9 GBytes  11.1 Gbits/sec
[  5]  0.0-10.0 sec  13.2 GBytes  11.3 Gbits/sec

vyatta@jeff:~$ show version
Version:      VC6.3-2011.07.21
Description:  Vyatta Core 6.3 2011.07.21

vyatta@jeff:~$ sudo vmtoolsd -v
VMware Tools daemon, version 9.0.0.15210 (build-782409)

vyatta@cyril:~$ show version
Version:      VC6.5R1
Description:  Vyatta Core 6.5 R1

vyatta@cyril:~$ sudo vmtoolsd -v
VMware Tools daemon, version 8.8.2.10499 (build-590212)