Gracias Rubén, ya he mandado la petición.
de todas formas te adjunto los resultados aquí por si sirve de ayuda también.
root@rescue:~# iperf -c iperf.testdebit.info -i 1
------------------------------------------------------------
Client connecting to iperf.testdebit.info, TCP port 5001
TCP window size: 45.0 KByte (default)
------------------------------------------------------------
[ 3] local 94.23.215.216 port 37757 connected with 89.84.127.54 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 9.88 MBytes 82.8 Mbits/sec
[ 3] 1.0- 2.0 sec 9.38 MBytes 78.6 Mbits/sec
[ 3] 2.0- 3.0 sec 10.4 MBytes 87.0 Mbits/sec
[ 3] 3.0- 4.0 sec 9.25 MBytes 77.6 Mbits/sec
[ 3] 4.0- 5.0 sec 10.0 MBytes 83.9 Mbits/sec
[ 3] 5.0- 6.0 sec 10.2 MBytes 86.0 Mbits/sec
[ 3] 6.0- 7.0 sec 10.2 MBytes 86.0 Mbits/sec
[ 3] 7.0- 8.0 sec 10.4 MBytes 87.0 Mbits/sec
[ 3] 8.0- 9.0 sec 10.1 MBytes 84.9 Mbits/sec
[ 3] 9.0-10.0 sec 10.4 MBytes 87.0 Mbits/sec
[ 3] 0.0-10.0 sec 100 MBytes 84.2 Mbits/sec
root@rescue:/# ethtool eth0 | grep -i speed
Speed: 1000Mb/s
root@rescue:/# wget
http://proof.ovh.net/files/10Gb.dat
--2015-03-26 15:42:26--
http://proof.ovh.net/files/10Gb.dat
Resolving proof.ovh.net (proof.ovh.net)... 188.165.12.106, 2001:41d0:276a::1
Connecting to proof.ovh.net (proof.ovh.net)|188.165.12.106|0... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1250000000 (1.2G) [application/octet-stream]
Saving to: `10Gb.dat'
73% [================================================== =================================> ] 920,831,586 108M/s in 8.1s
Cannot write to `10Gb.dat' (No space left on device).
P.D esto significa que el problema es el sistema ??