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Telecommunications Industry Association TR-30.3/10-08-022

Telecommunications Industry Association TR-30.3/10-08-022 Arlington, VA August 16 - 17, 2010. TCP/IP Performance under TIA 921A Impairments. Les Wu August 2010. Motivation and Caveats.

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Telecommunications Industry Association TR-30.3/10-08-022

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  1. Telecommunications Industry Association TR-30.3/10-08-022 Arlington, VA August 16 - 17, 2010

  2. TCP/IP Performanceunder TIA 921A Impairments Les Wu August 2010

  3. Motivation and Caveats • Much video, especially over-the-top video is carried by TCP. Given this, one is interested in the theoretic performance of TCP under a particular network condition. • Given this, a set of measurements has been made using “iperf” using an Anue impairment generator across the TIA 921a impairment suite. • Note: • The results presented here are considered preliminary. There are some missing test cases and the tests need to be re-run and validated. This submission will be updated in the future after these runs have been completed.

  4. iperf • http://iperf.sourceforge.net/ • Iperf was developed by NLANR/DAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss. • Requires both a server as well as client to run • Sample Output (test case 164A): ------------------------------------------------------------ Client connecting to 135.112.178.21, TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.26.64 port 53032 connected with 135.112.178.21 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-30.0 sec 24.2 MBytes 6.77 Mbits/sec

  5. Test Setup • iperf v2.0.5 server run on a Linux server box • iperf v2.0.5 client run on a WinXP box • Anue Systems GEM Network Emulator used to generate impairments • All interconnections and switch 1GbE • 30s iperf test run: • iperf -t30 -l 1400 -c <target IP> • With no impairments, TCP test results on the order of 930-950Mbit.

  6. iperf Performance Results *** Preliminary ***

  7. Iperf Performance Results (detail) *** Preliminary ***

  8. TCP Test Result Performance Distribution • 58% of A Profile test cases only support TCP bandwidth below 500kbit • <7% of A Profile results >2 Mbit • If these results are confirmed, this suggests the limitatiosn of TIA-921A cases for practical video transport

  9. n Backup Data

  10. Preliminary Results File

  11. iperf Performance Results *** Preliminary ***

  12. Iperf Performance Results (detail) *** Preliminary ***

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