Add text about how to avoid building profiled binaries.
Also fix some RST formatting and add some text on FreeBSD TCP congestion control algorithms. Fixes #410.
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docs/faq.rst
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docs/faq.rst
@ -70,6 +70,40 @@ How can I build a statically-linked executable of iperf3?
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It appears that for FreeBSD (tested on FreeBSD 11.1-RELEASE), only
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It appears that for FreeBSD (tested on FreeBSD 11.1-RELEASE), only
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the last two steps are needed to produce a static executable.
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the last two steps are needed to produce a static executable.
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How can I build on a system that doesn't support profiled executables?
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This problem has been noted by users attempting to build iperf3 for
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Android systems. There are three workarounds. In order from least
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effort to most effort:
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#. At the time the linking of the iperf3 profiled executable fails,
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the "normal" iperf3 executable is probably already created. So if
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you are willing to accept the error exit from the make process
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(and a little bit of wasted work on the build host), you might
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not need to do anything.
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#. After the configure step, there will be a definition in
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``src/Makefile`` that looks like this::
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noinst_PROGRAMS = t_timer$(EXEEXT) t_units$(EXEEXT) t_uuid$(EXEEXT) \
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iperf3_profile$(EXEEXT)
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If you edit it to look like this, it will disable the build of the profiled iperf3::
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noinst_PROGRAMS = t_timer$(EXEEXT) t_units$(EXEEXT) t_uuid$(EXEEXT)
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#. Similar to item 2 above, but more permanent...if you edit
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``src/Makefile.am`` and change the line reading like this::
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noinst_PROGRAMS = t_timer t_units t_uuid iperf3_profile
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To look like this::
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noinst_PROGRAMS = t_timer t_units t_uuid
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And then run ``./bootstrap.sh``, that will regenerate the project
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Makefiles to make the exclusion of the profiled iperf3 executable
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permanant (within that source tree).
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I'm seeing quite a bit of unexpected UDP loss. Why?
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I'm seeing quite a bit of unexpected UDP loss. Why?
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First, confirm you are using iperf 3.1.5 or higher. There was an
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First, confirm you are using iperf 3.1.5 or higher. There was an
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issue with the default UDP send size that was fixed in
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issue with the default UDP send size that was fixed in
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@ -85,6 +119,10 @@ What congestion control algorithms are supported?
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modules, which must be loaded before they can be used)::
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modules, which must be loaded before they can be used)::
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/sbin/sysctl net.ipv4.tcp_available_congestion_control
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/sbin/sysctl net.ipv4.tcp_available_congestion_control
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On FreeBSD, the equivalent command is::
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/sbin/sysctl net.inet.tcp.cc.available
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I’m using the ``--logfile`` option. How do I see file output in real time?
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I’m using the ``--logfile`` option. How do I see file output in real time?
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Use the ``--forceflush`` flag.
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Use the ``--forceflush`` flag.
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@ -113,8 +151,8 @@ Why can’t I run a UDP client with no server?
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I'm trying to use iperf3 to test a 40G/100G link...What do I need to know?
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I'm trying to use iperf3 to test a 40G/100G link...What do I need to know?
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See the following pages on fasterdata.es.net:
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See the following pages on fasterdata.es.net:
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- https://fasterdata.es.net/host-tuning/100g-tuning/
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- https://fasterdata.es.net/host-tuning/100g-tuning/
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- https://fasterdata.es.net/performance-testing/network-troubleshooting-tools/iperf/multi-stream-iperf3/
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- https://fasterdata.es.net/performance-testing/network-troubleshooting-tools/iperf/multi-stream-iperf3/
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My receiver didn't get all the bytes that got sent but there was no loss. Huh?
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My receiver didn't get all the bytes that got sent but there was no loss. Huh?
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iperf3 uses a control connection between the client and server to
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iperf3 uses a control connection between the client and server to
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