Slides show how to measure network performance using Iperf.

1. Network performance
measurement using IPERF
By Shravankumar Kiran Bhat
1

2. Measurement of parameters of network
Bandwidth Latency
Error Rate Jitter
2

3. IPERF is tool for
measurement of the
maximum achievable
bandwidth for IP
networks
3

4. Why Iperf ?
No manual data input Multiple parallel streams
4

5. How it works ?
SERVER
iperf -s
CLIENT
iperf -c <SERVER_IP>
5
data

6. Server
6

7. Client
7

8. Options
8

9. Server
9
-i set interval between reports

10. 10
-i set interval between reports
Client

11. 11
Server
-u Perform a UDP test

12. 12
Client
-u Perform a UDP test

13. 13
Client
-b Set target bandwidth

14. 14
Server
-b Set target bandwidth

15. 15
-t Time in seconds to transmit data
Client

16. 16
Server
-t Time in seconds to transmit data

17. 17
Client
-n Bytes to transmit

18. 18
Server
-n Bytes to transmit

19. 19
Client
-w Set window size

20. 20
Server
-w Set window size

21. 21
-m display maximum segment size
Client

22. 22
-m display maximum segment size
Server

23. 23
-P Number of parallel streams
Client

24. 24
-P Number of parallel streams
Server

25. 25
Client
-F Data as an input file

26. 26
Server
-F Data as an input file

27. 27
Client
-f Format of output

28. 28
Different formats which can be used
K - Kilobytes
M - Megabytes
G - Gigabytes
k - Kilobits
m - Megabits
g - Gigabits

29. 29
Server
-f Format of output

30. 30
Client
-p Port to use

31. 31
Server
-p Port to use

32. 32
Client
-l Specify datagram size

33. 33
Server
-l Specify datagram size

34. 34
Client
-r Bidirectional individual bandwidth measurement

35. 35
Server
-r Bidirectional individual bandwidth measurement

36. Tired of commands ?
36
Use
Jperf !

37. 37
Image courtesy of code.google.com/p/xjperf/

38. -s - Specify host as a server
-c - Specify host as client
-u - Perform UDP test
-i - Interval between reports
-t - Time to transmit for
-n - Bytes to transmit
-w - Set TCP window size
-P - Number of parallel streams to use
-b - Target bandwidth
-F - Input data via a file
-f - Format of output
-p - port to listen to
-l - Datagram size of UDP to use
-r - Bidirectional Individual bandwidth
-d - Bidirectional simultaneous bandwidth measurement
-D – Run server as daemon. Output to a file
PARAMETER LIST
38

39. Reference
• http://www.openss7.org
• http://bradhedlund.com/2008/12/19/how-to-calculate-tcp-throughput-for-
long-distance-links/
• http://www.tcpipguide.com/free/t_PerformanceMeasurementsSpeedBandwi
dthThroughputand.html
39

40. 40