Probleme mit Netzwerkperformance

[JoeDeNoir]

Hallo zusammen

ich habe mir einem vSphere Cluster massive Downloadratenprobleme. Diese konnte ich zwar mit dem abschalten von tcp_window_scaling lösen, allerdings frage ich mich, warum jenes überhaupt solche Probleme verursacht.

Dank und Grüße
Joe


Node1:
[root@NODE2 ~]# iperf -c server1.ip1
------------------------------------------------------------
Client connecting to server1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 57445 connected with server1.ip1 port 5001
[ 3] 0.0-10.9 sec 152 KBytes 115 Kbits/sec
[root@NODE2 ~]# iperf -c node1.ip1
------------------------------------------------------------
Client connecting to node1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 48534 connected with node1.ip1 port 5001
[ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec
[root@NODE2 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node2.ip1 port 5001 connected with server1.ip1 port 40626
[ 4] 0.0-10.0 sec 66.1 MBytes 55.3 Mbits/sec
[ 5] local node2.ip1 port 5001 connected with node1.ip1 port 51980
[ 5] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec

Node2:
[root@NODE1 ~]# iperf -c server1.ip1
------------------------------------------------------------
Client connecting to server1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 34726 connected with server1.ip1 port 5001
[ 3] 0.0-10.8 sec 152 KBytes 115 Kbits/sec
[root@NODE1 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node1.ip1 port 5001 connected with node2.ip1 port 48534
[ 4] 0.0-10.0 sec 1.09 GBytes 933 Mbits/sec
[ 5] local node1.ip1 port 5001 connected with server1.ip1 port 45062
[ 5] 0.0-10.0 sec 62.7 MBytes 52.5 Mbits/sec
[root@NODE1 ~]# iperf -c node2.ip1
------------------------------------------------------------
Client connecting to node2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 51980 connected with node2.ip1 port 5001
[ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec


Node1:
[root@NODE1 ~]# iperf -c server2.ip1
------------------------------------------------------------
Client connecting to server2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 59467 connected with server2.ip1 port 5001
[ 3] 0.0-11.2 sec 144 KBytes 105 Kbits/sec
[root@NODE1 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node1.ip1 port 5001 connected with server2.ip1 port 56955
[ 4] 0.0-11.2 sec 1.31 MBytes 987 Kbits/sec

Node2:
[root@NODE2 ~]# iperf -c server2.ip1
------------------------------------------------------------
Client connecting to server2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 54565 connected with server2.ip1 port 5001
[ 3] 0.0-11.3 sec 144 KBytes 104 Kbits/sec
[root@NODE2 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node2.ip1 port 5001 connected with server2.ip1 port 58262
[ 4] 0.0-16.2 sec 1.90 MBytes 982 Kbits/sec

Nach dem abschalten vom tcp_windows_scaling:

Node1:
[root@NODE1 ~]# iperf -c server1.ip1
------------------------------------------------------------
Client connecting to server1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 56281 connected with server1.ip1 port 5001
[ 3] 0.0-10.0 sec 56.2 MBytes 47.1 Mbits/sec
[root@NODE1 ~]# iperf -c server2.ip1
------------------------------------------------------------
Client connecting to server2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 38995 connected with server2.ip1 port 5001
[ 3] 0.0-10.0 sec 11.9 MBytes 9.99 Mbits/sec
[root@NODE1 ~]# iperf -c node2.ip1
------------------------------------------------------------
Client connecting to node2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node1.ip1 port 54878 connected with node2.ip1 port 5001
[ 3] 0.0-10.0 sec 1.08 GBytes 926 Mbits/sec
[root@NODE1 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node1.ip1 port 5001 connected with node2.ip1 port 42222
[ 4] 0.0-10.0 sec 1.06 GBytes 913 Mbits/sec
[ 5] local node1.ip1 port 5001 connected with server1.ip1 port 40097
[ 5] 0.0-10.0 sec 39.9 MBytes 33.4 Mbits/sec
[ 4] local node1.ip1 port 5001 connected with server2.ip1 port 57399
[ 4] 0.0-10.9 sec 1.28 MBytes 987 Kbits/sec

Node2:
[root@NODE2 ~]# iperf -c server1.ip1
------------------------------------------------------------
Client connecting to server1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 57178 connected with server1.ip1 port 5001
[ 3] 0.0-10.0 sec 55.2 MBytes 46.3 Mbits/sec
[root@NODE2 ~]# iperf -c server2.ip1
------------------------------------------------------------
Client connecting to server2.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 56709 connected with server2.ip1 port 5001
[ 3] 0.0-10.0 sec 11.9 MBytes 9.94 Mbits/sec
[root@NODE2 ~]# iperf -c node1.ip1
------------------------------------------------------------
Client connecting to node1.ip1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[ 3] local node2.ip1 port 57333 connected with node1.ip1 port 5001
[ 3] 0.0-10.0 sec 1.08 GBytes 926 Mbits/sec
[root@NODE2 ~]# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local node2.ip1 port 5001 connected with server1.ip1 port 45919
[ 4] 0.0-10.1 sec 584 KBytes 474 Kbits/sec
[ 5] local node2.ip1 port 5001 connected with server2.ip1 port 54589
[ 5] 0.0-10.9 sec 1.27 MBytes 981 Kbits/sec