Slow transfer speed between two servers
- by Linux Guy
I have two servers both network cards speed is 10Gbps
The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs
Both servers using public ip addresses in public and private network
Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos
I check the transfer speed using iperf utility From Server A to Server B
# iperf -c 0.0.0.1 -p 8777
------------------------------------------------------------
Client connecting to 0.0.0.1, TCP port 8777
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 3] local 0.0.0.0 port 38895 connected with 0.0.0.1 port 8777
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec
My Current Connections in Server B
# netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c
2072 TIME_WAIT
28 SYN_RECV
1 LISTEN
189 LAST_ACK
139 FIN_WAIT2
373 FIN_WAIT1
3381 ESTABLISHED
34 CLOSING
Server A Network Card Information
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: 10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: Yes
Speed: 10000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: external
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
Server B Network Card Information
Settings for eth2:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: No
Advertised link modes: 10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: Direct Attach Copper
PHYAD: 0
Transceiver: external
Auto-negotiation: off
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow
when i restart network service the connection will be ok , after 2 minutes , it's getting slow
How could i troubleshoot slow speed issue and fix it in server B ?
Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments
