iperf2

By Author: rjmcmahon
Many people still use iperf as a tool for testing networks and for qualifying networking products. While there seems a major push to go to iperf3 the iperf 2.0.5 code base benefits from bug fixes as well as some incremental feature enhancements. In that context, Iperf2 code here attempts to maintain backward compatibility (due to things like automated scripts), maintain broad OS support while keeping the tool current enough with a minimal change set to the iperf code base.

Feature

  • Fix portability, compile and tested with Linux, Win10, Win7, WinXP, MacOS, Android and some set-top box OSs.
  • Require -u for UDP (-b no longer defaults to UDP)
  • Improved performance
  • Enhanced reporting with -e
  • Support smaller report intervals (5 ms or greater)
  • Support SO_RCVTIMEOUT for server reports regardless of no packets
  • Support SO_SNDTIMEO on send so socket write won't block beyond -t or -i
  • Support SO_TIMESTAMP for kernel level packet timestamping
  • Support end/end latency in mean/min/max/stdev format (UDP) (-e required)
  • (assumes client and server clocks synched, e.g by Precision Time Protocol)
  • Add local port to bind support (-B option) using colon as separator
  • (e.g. iperf -c 192.168.100.100 -B 192.168.100.10:6001)
  • Support TCP rate limited streams (via the -b) using token bucket
  • Support packets per second (UDP) via pps as units, (e.g. -b 1000pps)
  • Display PPS in both client and server reports (UDP) (-e required)
  • Support realtime scheduler as a command line option (--realtime or -z, assumes proper user privileges)
  • Improve client tx code path so actual tx offered rate will converge to the -b value
  • Improve accuracy of microsecond delay calls (in platform independent manner)
  • (Use of Kalman filter to predict delay errors and adjust delays per predicted error)
  • Display target loop time in initial client header (UDP)
  • Fix final latency report sent from server to client (UDP)
  • Include standard deviation in latency output
  • Suppress unrealistic latency output using (-/-/-/-)
  • Use clock_gettime() in critical sections, if available, replacing gettimeofday() calls
  • TCP write and error counts (TCP retries and CWND for linux) (-e required)
  • TCP read count, TCP read histogram (8 bins) (-e required)
  • TCP RTT and CWND values in client reports (-e required, Linux only, RTT units microseconds)
  • Added support for -t on the Server (Listener) so servers/listener can be set to timeout and exit

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