[vbox-dev] bridged network between VMs on same host is very slow

[Mogamat Abrahams]

> >Data transfer between VMs on the same host is very, very slow ~16KB/s.
I am finding slowness with Windows guest to Linux Host and also general slowness
on network access from client pc to any guest.

Iperf from windows guest to its linux 2.6.32 host
[  5] local 192.168.0.3 port 5001 connected with 192.168.0.200 port 2854
[  5]  0.0-10.0 sec   268 MBytes   224 Mbits/sec

iperf from linux 2.6.24.5 guest to linux 2.6.32 host
[  4] local 192.168.0.3 port 5001 connected with 192.168.0.201 port 54089
[  4]  0.0-10.0 sec  4.10 GBytes  3.52 Gbits/sec

from win7 64bt client to linux host 
[  4] local 192.168.0.3 port 5001 connected with 192.168.0.125 port 61000
[  4]  0.0-10.0 sec   826 MBytes   690 Mbits/sec

>From Linux Guest to Windows Guest
[  4] local 192.168.0.200 port 5001 connected with 192.168.0.201 port 33430
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec  1.23 GBytes  1.06 Gbits/sec

>From Win 7-64 client to windows guest.
[  4] local 192.168.0.200 port 5001 connected with 192.168.0.125 port 60957
[  4]  0.0-10.2 sec   392 MBytes   324 Mbits/sec

Using bridged interface to eth0 (e1000e), host is Core i5 2400, 4gb ddr3

Speeds were terrible using a Realtek PCI card 8169, something like 4.25mbts but
perhaps a hardware incompatibility.

M