Az USB 2.0-nak kisebb a sávszélessége, mint a 100 megás Ethernetnek.
Az USB 2.0 sebessége 480Mbps, ami még úgy is jobb a 100-as ethernetnél, hogy az USB 2.0 csak egy érpárat használ adatra oda-vissza, a 10/100-as ethernetnek meg külön van adás és vétel érpárja.
Teszteld le a dolgot, egy USB/ethernet adaptert simán ki lehet hajtani 100Mbps-ra USB 2.0-s porton, ha 10/100-as, de egy gigabites adaptert még tovább is.
Nálam ez jött ki egy USB 3.0/ethernet adapterrel, ha USB 2.0-s portban használtam:
iperf3 egyirányú kapcsolattal:
-------------------------------------------------------------------------------
iperf3 -c 192.168.1.22
Connecting to host 192.168.1.22, port 5201
[ 4] local 192.168.1.11 port 44848 connected to 192.168.1.22 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 43.7 MBytes 366 Mbits/sec 0 199 KBytes
[ 4] 1.00-2.00 sec 43.1 MBytes 362 Mbits/sec 0 199 KBytes
[ 4] 2.00-3.00 sec 42.9 MBytes 360 Mbits/sec 0 199 KBytes
[ 4] 3.00-4.00 sec 43.1 MBytes 361 Mbits/sec 0 199 KBytes
[ 4] 4.00-5.00 sec 43.3 MBytes 363 Mbits/sec 0 199 KBytes
[ 4] 5.00-6.00 sec 43.1 MBytes 362 Mbits/sec 0 199 KBytes
[ 4] 6.00-7.00 sec 43.2 MBytes 362 Mbits/sec 0 199 KBytes
[ 4] 7.00-8.00 sec 43.0 MBytes 360 Mbits/sec 0 199 KBytes
[ 4] 8.00-9.00 sec 43.2 MBytes 362 Mbits/sec 0 199 KBytes
[ 4] 9.00-10.00 sec 44.6 MBytes 374 Mbits/sec 0 494 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 433 MBytes 363 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 431 MBytes 361 Mbits/sec receiver
iperf kétirányú kapcsolattal:
---------------------------------------------------------------------------
iperf -c 192.168.1.22 -d -P 1 -i 1
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
------------------------------------------------------------
Client connecting to 192.168.1.22, TCP port 5001
TCP window size: 230 KByte (default)
------------------------------------------------------------
[ 5] local 192.168.1.11 port 58516 connected with 192.168.1.22 port 5001
[ 4] local 192.168.1.11 port 5001 connected with 192.168.1.22 port 44474
[ ID] Interval Transfer Bandwidth
[ 5] 0.0- 1.0 sec 32.4 MBytes 272 Mbits/sec
[ 4] 0.0- 1.0 sec 12.1 MBytes 102 Mbits/sec
[ 4] 1.0- 2.0 sec 11.5 MBytes 96.3 Mbits/sec
[ 5] 1.0- 2.0 sec 32.0 MBytes 268 Mbits/sec
[ 5] 2.0- 3.0 sec 30.8 MBytes 258 Mbits/sec
[ 4] 2.0- 3.0 sec 12.5 MBytes 105 Mbits/sec
[ 5] 3.0- 4.0 sec 30.8 MBytes 258 Mbits/sec
[ 4] 3.0- 4.0 sec 12.5 MBytes 105 Mbits/sec
[ 5] 4.0- 5.0 sec 30.8 MBytes 258 Mbits/sec
[ 4] 4.0- 5.0 sec 12.8 MBytes 108 Mbits/sec
[ 4] 5.0- 6.0 sec 11.9 MBytes 99.5 Mbits/sec
[ 5] 5.0- 6.0 sec 31.8 MBytes 266 Mbits/sec
[ 4] 6.0- 7.0 sec 10.9 MBytes 91.5 Mbits/sec
[ 5] 6.0- 7.0 sec 32.5 MBytes 273 Mbits/sec
[ 5] 7.0- 8.0 sec 31.8 MBytes 266 Mbits/sec
[ 4] 7.0- 8.0 sec 11.4 MBytes 96.0 Mbits/sec
[ 4] 8.0- 9.0 sec 9.39 MBytes 78.7 Mbits/sec
[ 5] 8.0- 9.0 sec 34.9 MBytes 293 Mbits/sec
[ 4] 9.0-10.0 sec 11.4 MBytes 95.3 Mbits/sec
[ 5] 9.0-10.0 sec 32.4 MBytes 272 Mbits/sec
[ 5] 0.0-10.0 sec 320 MBytes 268 Mbits/sec
[ 4] 0.0-10.0 sec 117 MBytes 97.8 Mbits/sec