perfSONAR User Q&A and Other Discussion

[Bruce Mah <>]

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ESnet (Energy Sciences Network) announces iperf-3.1.5, the latest
point/bugfix release from the iperf 3.1 codeline.

iperf-3.1.5 introduces two significant changes in existing features.
The user interface for the fair-queueing per-socket pacing (supported
on recent Linux kernels) has been changed.  It is now specified with
the --fq-rate command-line flag, separately from iperf3's own internal
pacing that is specified with the --bandwidth/-b command-line flag.
Note that for some testing scenarios, this may mean that both the
- --bandwidth/-b and --fq-rate flags need to be specified when invoking
the iperf3 executable.  This feature was accessed differently in the
iperf 3.1.3 and 3.1.4 releases.

The default size of UDP datagrams is no longer 8KB, but is determined
dynamically at run time to be some appropriate value.  This change was
made to avoid problems with large UDP datagrams being generated and
fragmented (for example on Ethernet networks with 1500-byte MTUs).
The sizes and spacing of data packets generated for UDP tests may
differ from UDP tests run with prior versions of iperf3.

More information on changes can be found in the RELEASE_NOTES
file in the source distribution.

iperf3 is a tool for measuring the maximum TCP and UDP performance
along a path, allowing for the tuning of various parameters and
reporting measurements such as throughput, jitter, and datagram packet
loss.  It is fully supported on Linux, FreeBSD, and MacOS X.  It may
run on other platforms as well, although it has not received the same
attention and testing.  Note that iperf3 is not compatible with, and
will not interoperate with, version 2 or earlier of iperf.

The source code for iperf 3.1.5 is available at:

http://downloads.es.net/pub/iperf/iperf-3.1.5.tar.gz

SHA256 hash:

6e1a6200cd38baeab58ef0d7b8769e7aa6410c3a3168e65ea8277a4de79e5500  
iperf-3.1.5.tar.gz

iperf3 is freely-redistributable under a 3-clause BSD license.  More
information can be found in the LICENSE file inside the source
distribution.

Additional documentation for iperf3 can be found at:

http://software.es.net/iperf

More information about iperf3 (including the issue tracker, source
code repository access, and mailing list) can be found on the iperf3
page on GitHub at:

https://github.com/esnet/iperf

The mailing list for iperf3 development is:



To see the list archives or join the mailing list, visit:

http://groups.google.com/group/iperf-dev

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