perfSONAR User Q&A and Other Discussion

[Bob McMahon <>]

Hi Bruce,

With iperf 2 we limit the server read rate per -b or --bandwidth. Curious to why iperf 3 chose a different flag for this?

Thanks,
Bob 

On Mon, Aug 17, 2020 at 1:15 PM Bruce Mah <> wrote:

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ESnet (Energy Sciences Network) is proud to announce the availability
of iperf 3.9.  This release adds a --timestamps flag, which prepends a
timestamp to each output line.  A new --server-bitrate-limit flag has
been added as a server command-line argument, and allows an iperf3
server to enforce a maximum throughput rate.  Several minor bugs were
also fixed.  More information can be found in the iperf-3.9 release
notes, which are contained in the RELNOTES.md file in the
distribution.

iperf 3.9 should be fully backward-compatible with prior iperf3
releases, that is, iperf 3.9 clients and servers should interoperate
correctly with all 3.x clients and servers.

iperf3 is a tool for measuring the maximum TCP, UDP, and SCTP
throughput 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.  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,
although the two versions can co-exist on the same hosts and networks.

The source code for iperf 3.9 is available at:

https://downloads.es.net/pub/iperf/iperf-3.9.tar.gz

SHA256 hash:

24b63a26382325f759f11d421779a937b63ca1bc17c44587d2fcfedab60ac038

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:

https://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

User questions can go to the iperf users list (which is more-or-less
shared between iperf2 and iperf3):



Mailing list information and archives can be found at:

https://lists.sourceforge.net/lists/listinfo/iperf-users

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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