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lbaops:expres-singaporetests

Connectivity tests via Singapore

Default Oz-Europe route is via Singapore and 4×155 Mbps links (aggregated). This has the lowest RTT which is what most users want.

Testing Methology

iperf in TCP and UDP mode. In TCP mode trying various different window sizes. Most tests were short, 30-120 sec

Hosts

Host Location
epvsi1-ext Sydney
pkvsi1-ext Parkes
cavsi1-ext Narrabri
mpvsi1-ext Mopra
Huygens Netherlands

UDP Tests

Sydney → Netherlands (9/1/2007)

Nominal Rate Achieved Average Packet Loss
10 Mbps 9.9 Mbps 1[=%=]
50 Mbps 50 Mbps 0[=%=]
100 Mbps 100 Mbps 0.02[=%=]
120 Mbps 120 Mbps 0.25[=%=]
130 Mbps 126 Mbps 3.5[=%=]
200 Mbps 136 Mbps 33[=%=]

Sydney → Netherlands (10/1/2007)

Nominal Rate Achieved Average Packet Loss
100 Mbps 100 Mbps 0.03[=%=]
120 Mbps 118 Mbps 1.4[=%=]

Observatories → Netherlands (10/1/2007)

Site Nominal Rate Achieved Average Packet Loss
Parkes 100 Mbps 100 Mbps 0.000[=%=]
Parkes 120 Mbps 118 Mbps 1.6[=%=]
Narrabri 100 Mbps 100 Mbps 0.37[=%=]
Narrabri 120 Mbps 117 Mbps 2.5[=%=]
Mopra 100 Mbps 100 Mbps 0.39[=%=]
Mopra 120 Mbps 116 Mbps 3.5[=%=]

Simultaneous Tests (Multiple UDP streams from observatories, 11/1/2007)

Running three iperf sessions simultaneously (120sec each)

Sites Nominal Rate Achieved Average Packet Loss
Parkes+Mopra 100 Mbps 100/100 Mbps 0.17/0.17[=%=]
Parkes+Narrabri 100 Mbps 100/100 Mbps 0.3/0.3[=%=]
Sydney,Sydney,Sydney 100 Mbps 49/48/46 Mbps 51/51/54[=%=]
Mopra+Narrabri+Parkes 100 Mbps 47/47/47 Mbps 53/53/53[=%=]

15/1/2007

It turns out links are shared on a hashing algorithm based on IP address and port numbers. This is deterministic but unlucky choice of port number may mean two streams are forced onto the same 155 Mbps link even though this leads to asymmetric use.

Testing with careful choice of port number…

Sites Port Nominal Rate Achieved Average Packet Loss
ATCA+Mopra 52102/52100 100 Mbps 100/100 Mbps 0.39/0.39[=%=]

TCP tests

These tests with iperf with various window sizes. Given the relatively slow ramp up time the average and ~95 percentile values are given (eyeballed).

Round trip time is 311 msec.

60 second tests

Sites TCP window Average Peak
Sydney 2 MB 14 Mbps 18 Mbps
Sydney 1 MB 16 Mbps 20 Mbps
Sydney 800 kB 12 Mbps 14 Mbps
JIVE 4 MB 23 Mbps 24 Mbps
JIVE 5 MB 40 Mbps 43 Mbps
JIVE 2 MB 43 Mbps 48 Mbps
JIVE 1 MB 19 Mbps 20 Mbps
JIVE 3 MB 56 Mbps 65 Mbps
Sydney 2 MB 29 Mbps 36 Mbps
Sydney 3 MB 44 Mbps 60 Mbps
lbaops/expres-singaporetests.txt · Last modified: 2015/12/18 16:38 (external edit)