Very puzzle network issue: rx and tx are not symmetry

[fisherwei]

Freenas and my PC are connected by directly cat6 cable or crossing a 1g-base switch, whatever the results were same.


Fisher-IWS:~ fisher$ iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 128 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.10.20 port 5001 connected with 192.168.10.10 port 41488
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 889 MBytes 745 Mbits/sec
^CFisher-IWS:~ fisher$
Fisher-IWS:~ fisher$
Fisher-IWS:~ fisher$ iperf -c 192.168.10.10
------------------------------------------------------------
Client connecting to 192.168.10.10, TCP port 5001
TCP window size: 129 KByte (default)
------------------------------------------------------------
[ 4] local 192.168.10.20 port 49284 connected with 192.168.10.10 port 5001
[ ID] Interval Transfer Bandwidth

[ 4] 0.0-14.3 sec 5.62 MBytes 3.30 Mbits/sec

Anyone advise? Thanks~~~~~~~~

 

[HolyK]

Check simplex/duplex mode (should be 1000BaseT/duplex)
Check QoS or packet prioritization.
Sniff the network (Wireshark)