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| <section id="iperf3-development"> |
| <h1>iperf3 Development<a class="headerlink" href="#iperf3-development" title="Link to this heading">¶</a></h1> |
| <p>The iperf3 project is hosted on GitHub at:</p> |
| <p><a class="reference external" href="http://github.com/esnet/iperf">http://github.com/esnet/iperf</a></p> |
| <p>This site includes the source code repository, issue tracker, and |
| wiki.</p> |
| <section id="mailing-lists"> |
| <h2>Mailing Lists<a class="headerlink" href="#mailing-lists" title="Link to this heading">¶</a></h2> |
| <p>The developer list for iperf3 is: <a class="reference external" href="mailto:iperf-dev%40googlegroups.com">iperf-dev<span>@</span>googlegroups<span>.</span>com</a>. |
| Information on joining the mailing list can be found at:</p> |
| <p><a class="reference external" href="http://groups.google.com/group/iperf-dev">http://groups.google.com/group/iperf-dev</a></p> |
| <p>There is, at the moment, no mailing list for user questions, although |
| a low volume of inquiries on the developer list is probably |
| acceptable. If necessary, a user-oriented mailing list might be |
| created in the future.</p> |
| </section> |
| <section id="bug-reports"> |
| <h2>Bug Reports<a class="headerlink" href="#bug-reports" title="Link to this heading">¶</a></h2> |
| <p>Before submitting a bug report, try checking out the latest version of |
| the code, and confirm that it’s not already fixed. Also see the <a class="reference internal" href="faq.html"><span class="doc">iperf3 FAQ</span></a>. |
| Then submit to the iperf3 issue tracker on GitHub:</p> |
| <p><a class="reference external" href="https://github.com/esnet/iperf/issues">https://github.com/esnet/iperf/issues</a></p> |
| <p>For reporting potential security issues, please contact the developers at |
| <a class="reference external" href="mailto:iperf%40es.net">iperf<span>@</span>es<span>.</span>net</a>.</p> |
| <p><strong>Note:</strong> Issues submitted to the old iperf3 issue tracker on Google |
| Code (or comments to existing issues on the Google Code issue tracker) |
| will be ignored.</p> |
| </section> |
| <section id="changes-from-iperf-2-x"> |
| <h2>Changes from iperf 2.x<a class="headerlink" href="#changes-from-iperf-2-x" title="Link to this heading">¶</a></h2> |
| <p>New options (not necessarily complete, please refer to the manual page |
| for a complete list of iperf3 options):</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">V</span><span class="p">,</span> <span class="o">--</span><span class="n">verbose</span> <span class="n">more</span> <span class="n">detailed</span> <span class="n">output</span> <span class="n">than</span> <span class="n">before</span> |
| <span class="o">-</span><span class="n">J</span><span class="p">,</span> <span class="o">--</span><span class="n">json</span> <span class="n">output</span> <span class="ow">in</span> <span class="n">JSON</span> <span class="nb">format</span> |
| <span class="o">-</span><span class="n">Z</span><span class="p">,</span> <span class="o">--</span><span class="n">zerocopy</span> <span class="n">use</span> <span class="n">a</span> <span class="s1">'zero copy'</span> <span class="n">sendfile</span><span class="p">()</span> <span class="n">method</span> <span class="n">of</span> <span class="n">sending</span> <span class="n">data</span> |
| <span class="o">-</span><span class="n">O</span><span class="p">,</span> <span class="o">--</span><span class="n">omit</span> <span class="n">N</span> <span class="n">omit</span> <span class="n">the</span> <span class="n">first</span> <span class="n">n</span> <span class="n">seconds</span> <span class="p">(</span><span class="n">to</span> <span class="n">ignore</span> <span class="n">slowstart</span><span class="p">)</span> |
| <span class="o">-</span><span class="n">T</span><span class="p">,</span> <span class="o">--</span><span class="n">title</span> <span class="nb">str</span> <span class="n">prefix</span> <span class="n">every</span> <span class="n">output</span> <span class="n">line</span> <span class="k">with</span> <span class="n">this</span> <span class="n">string</span> |
| <span class="o">-</span><span class="n">F</span><span class="p">,</span> <span class="o">--</span><span class="n">file</span> <span class="n">name</span> <span class="n">xmit</span><span class="o">/</span><span class="n">recv</span> <span class="n">the</span> <span class="n">specified</span> <span class="n">file</span> |
| <span class="o">-</span><span class="n">A</span><span class="p">,</span> <span class="o">--</span><span class="n">affinity</span> <span class="n">n</span><span class="o">/</span><span class="n">n</span><span class="p">,</span><span class="n">m</span> <span class="nb">set</span> <span class="n">CPU</span> <span class="n">affinity</span> <span class="p">(</span><span class="n">Linux</span> <span class="ow">and</span> <span class="n">FreeBSD</span> <span class="n">only</span><span class="p">)</span> |
| <span class="o">-</span><span class="n">k</span><span class="p">,</span> <span class="o">--</span><span class="n">blockcount</span> <span class="c1">#[KMG] number of blocks (packets) to transmit (instead</span> |
| <span class="n">of</span> <span class="o">-</span><span class="n">t</span> <span class="ow">or</span> <span class="o">-</span><span class="n">n</span><span class="p">)</span> |
| <span class="o">-</span><span class="n">L</span><span class="p">,</span> <span class="o">--</span><span class="n">flowlabel</span> <span class="nb">set</span> <span class="n">IPv6</span> <span class="n">flow</span> <span class="n">label</span> <span class="p">(</span><span class="n">Linux</span> <span class="n">only</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Changed flags:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">C</span><span class="p">,</span> <span class="o">--</span><span class="n">linux</span><span class="o">-</span><span class="n">congestion</span> <span class="nb">set</span> <span class="n">congestion</span> <span class="n">control</span> <span class="n">algorithm</span> <span class="p">(</span><span class="n">Linux</span> <span class="n">only</span><span class="p">)</span> |
| <span class="p">(</span><span class="o">-</span><span class="n">Z</span> <span class="ow">in</span> <span class="n">iperf2</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Deprecated flags (currently no plans to support):</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">-</span><span class="n">d</span><span class="p">,</span> <span class="o">--</span><span class="n">dualtest</span> <span class="n">Do</span> <span class="n">a</span> <span class="n">bidirectional</span> <span class="n">test</span> <span class="n">simultaneously</span> |
| <span class="o">-</span><span class="n">r</span><span class="p">,</span> <span class="o">--</span><span class="n">tradeoff</span> <span class="n">Do</span> <span class="n">a</span> <span class="n">bidirectional</span> <span class="n">test</span> <span class="n">individually</span> |
| <span class="o">-</span><span class="n">T</span><span class="p">,</span> <span class="o">--</span><span class="n">ttl</span> <span class="n">time</span><span class="o">-</span><span class="n">to</span><span class="o">-</span><span class="n">live</span><span class="p">,</span> <span class="k">for</span> <span class="n">multicast</span> <span class="p">(</span><span class="n">default</span> <span class="mi">1</span><span class="p">)</span> |
| <span class="o">-</span><span class="n">x</span><span class="p">,</span> <span class="o">--</span><span class="n">reportexclude</span> <span class="p">[</span><span class="n">CDMSV</span><span class="p">]</span> <span class="n">exclude</span> <span class="n">C</span><span class="p">(</span><span class="n">connection</span><span class="p">)</span> <span class="n">D</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="n">M</span><span class="p">(</span><span class="n">multicast</span><span class="p">)</span> |
| <span class="n">S</span><span class="p">(</span><span class="n">settings</span><span class="p">)</span> <span class="n">V</span><span class="p">(</span><span class="n">server</span><span class="p">)</span> <span class="n">reports</span> |
| <span class="o">-</span><span class="n">y</span><span class="p">,</span> <span class="o">--</span><span class="n">reportstyle</span> <span class="n">C</span> <span class="n">report</span> <span class="k">as</span> <span class="n">a</span> <span class="n">Comma</span><span class="o">-</span><span class="n">Separated</span> <span class="n">Values</span> |
| </pre></div> |
| </div> |
| <p>Also deprecated is the ability to set the options via environment |
| variables.</p> |
| </section> |
| <section id="known-issues"> |
| <h2>Known Issues<a class="headerlink" href="#known-issues" title="Link to this heading">¶</a></h2> |
| <p>The following problems are notable known issues, which are probably of |
| interest to a large fraction of users or have high impact for some |
| users, and for which issues have already been filed in the issue |
| tracker. These issues are either open (indicating no solution |
| currently exists) or closed with the notation that no further attempts |
| to solve the problem are currently being made:</p> |
| <ul class="simple"> |
| <li><p>The <code class="docutils literal notranslate"><span class="pre">-Z</span></code> flag sometimes causes the iperf3 client to hang on OSX. |
| (Issue #129)</p></li> |
| <li><p>When specifying the TCP buffer size using the <code class="docutils literal notranslate"><span class="pre">-w</span></code> flag on Linux, |
| the Linux kernel automatically doubles the value passed in to |
| compensate for overheads. (This can be observed by using |
| iperf3’s <code class="docutils literal notranslate"><span class="pre">--debug</span></code> flag.) However, CWND does not actually ramp up |
| to the doubled value, but only to about 75% of the doubled |
| value. Some part of this behavior is documented in the tcp(7) |
| manual page.</p></li> |
| <li><p>Although the <code class="docutils literal notranslate"><span class="pre">-w</span></code> flag is documented as setting the (TCP) window |
| size, it is also used to set the socket buffer size. This has been |
| shown to be helpful with high-bitrate UDP tests.</p></li> |
| <li><p>On some platforms (observed on at least one version of Ubuntu |
| Linux), it might be necessary to invoke <code class="docutils literal notranslate"><span class="pre">ldconfig</span></code> manually after |
| doing a <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">install</span></code> before the <code class="docutils literal notranslate"><span class="pre">iperf3</span></code> executable can find |
| its shared library. (Issue #153)</p></li> |
| <li><p>The results printed on the server side at the end of a test do not |
| correctly reflect the client-side measurements. This is due to the |
| ordering of computing and transferring results between the client |
| and server. (Issue #293)</p></li> |
| <li><p>The server could have a very short measurement reporting interval at |
| the end of a test (particularly a UDP test), containing few or no |
| packets. This issue is due to an artifact of timing between the |
| client and server. (Issue #278)</p></li> |
| </ul> |
| <p>There are, of course, many other open and closed issues in the issue |
| tracker.</p> |
| </section> |
| <section id="versioning"> |
| <h2>Versioning<a class="headerlink" href="#versioning" title="Link to this heading">¶</a></h2> |
| <p>iperf3 version numbers use (roughly) a <a class="reference external" href="http://semver.org/">Semantic Versioning</a> scheme, in which version numbers consist of |
| three parts: <em>MAJOR.MINOR.PATCH</em></p> |
| <p>The developers increment the:</p> |
| <ul class="simple"> |
| <li><p><em>MAJOR</em> version when making incompatible API changes,</p></li> |
| <li><p><em>MINOR</em> version when adding functionality in a backwards-compatible manner, and</p></li> |
| <li><p><em>PATCH</em> version when making backwards-compatible bug fixes.</p></li> |
| </ul> |
| </section> |
| <section id="release-engineering-checklist"> |
| <h2>Release Engineering Checklist<a class="headerlink" href="#release-engineering-checklist" title="Link to this heading">¶</a></h2> |
| <ol class="arabic"> |
| <li><p>Update the <code class="docutils literal notranslate"><span class="pre">README.md</span></code> and <code class="docutils literal notranslate"><span class="pre">RELNOTES.md</span></code> files to be accurate. Make sure |
| that the “Known Issues” section of the <code class="docutils literal notranslate"><span class="pre">README.md</span></code> file and in this document |
| are up to date.</p></li> |
| <li><p>Compose a release announcement. Most of the release announcement |
| can be written before tagging. Usually the previous version’s |
| announcement can be used as a starting point.</p></li> |
| <li><p>Preferably starting from a clean source tree (be sure that <code class="docutils literal notranslate"><span class="pre">git</span> |
| <span class="pre">status</span></code> emits no output), make the changes necessary to produce |
| the new version, such as bumping version numbers:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>vi RELNOTES.md # update version number and release date |
| vi configure.ac # update version parameter in AC_INIT |
| vi src/iperf3.1 # update manpage revision date if needed |
| vi src/libiperf.3 # update manpage revision date if needed |
| git commit -a # commit changes to the local repository only |
| ./bootstrap.sh # regenerate configure script, etc. |
| git commit -a # commit changes to the local repository only |
| |
| # Assuming that $VERSION is the version number to be released... |
| ./make_release tag $VERSION # this creates a tag in the local repo |
| ./make_release tar $VERSION # create tarball and compute SHA256 hash |
| </pre></div> |
| </div> |
| <p>These steps should be done on a platform with a relatively recent |
| version of autotools / libtools. Examples are MacOS / MacPorts or |
| FreeBSD. The versions of these tools in CentOS 6 are somewhat |
| older and probably should be avoided.</p> |
| <p>The result will be a release artifact that should be used for |
| pre-testing.</p> |
| </li> |
| <li><p>Stage the tarball (and a file containing the SHA256 hash) to the |
| download site. Currently this is located on <code class="docutils literal notranslate"><span class="pre">downloads.es.net</span></code>.</p></li> |
| <li><p>From another host, test the link in the release announcement by |
| downloading a fresh copy of the file and verifying the SHA256 |
| checksum. Checking all other links in the release announcement is |
| strongly recommended as well.</p></li> |
| <li><p>Also verify (with file(1)) that the tarball is actually a gzipped |
| tarball.</p></li> |
| <li><p>For extra points, actually try downloading, compiling, and |
| smoke-testing the results of the tarball on all supported |
| platforms.</p></li> |
| <li><p>Plug the SHA256 checksum into the release announcement.</p></li> |
| <li><p>PGP-sign the release announcement text using <code class="docutils literal notranslate"><span class="pre">gpg</span> <span class="pre">--clearsign</span></code>. |
| The signed announcement will be sent out in a subsequent emails, |
| but could also be archived. Decoupling the signing from emailing |
| allows a signed release announcement to be resent via email or sent |
| by other, non-email means.</p></li> |
| <li><p>At this point, the release can and should be considered |
| finalized. To commit the release-engineering-related changes to |
| GitHub and make them public, push them out thusly:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">git</span> <span class="n">push</span> <span class="c1"># Push version changes</span> |
| <span class="n">git</span> <span class="n">push</span> <span class="o">--</span><span class="n">tags</span> <span class="c1"># Push the new tag to the GitHub repo</span> |
| </pre></div> |
| </div> |
| </li> |
| <li><p>Send the PGP-signed release announcement to the following |
| addresses. Remember to turn off signing in the MUA, if |
| applicable. Remember to check the source address when posting to |
| lists, as “closed” list will reject posting from all from |
| registered email addresses.</p> |
| <ul class="simple"> |
| <li><p><a class="reference external" href="mailto:iperf-dev%40googlegroups.com">iperf-dev<span>@</span>googlegroups<span>.</span>com</a></p></li> |
| <li><p><a class="reference external" href="mailto:iperf-users%40lists.sourceforge.net">iperf-users<span>@</span>lists<span>.</span>sourceforge<span>.</span>net</a></p></li> |
| <li><p><a class="reference external" href="mailto:perfsonar-user%40internet2.edu">perfsonar-user<span>@</span>internet2<span>.</span>edu</a></p></li> |
| <li><p><a class="reference external" href="mailto:perfsonar-developer%40internet2.edu">perfsonar-developer<span>@</span>internet2<span>.</span>edu</a></p></li> |
| </ul> |
| <p>Note: Thunderbird sometimes mangles the PGP-signed release |
| announcement so that it does not verify correctly. This could be |
| due to Thunderbird trying to wrap the length of extremely long |
| lines (such as the SHA256 hash). Apple Mail and mutt seem to |
| handle this situation correctly. Testing the release announcement |
| sending process by sending a copy to oneself first and attempting |
| to verify the signature is highly encouraged.</p> |
| </li> |
| <li><p>Update GitHub Releases with the current release notes.</p></li> |
| <li><p>Update the iperf3 Project News section of the documentation site |
| to announce the new release (see <code class="docutils literal notranslate"><span class="pre">docs/news.rst</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">docs/conf.py</span></code> in the source tree) and deploy a new build of the |
| documentation to GitHub Pages.</p></li> |
| <li><p>If an update to the on-line manual page is needed, it can be |
| generated with this sequence of commands (tested on CentOS 7) and |
| import the result into <code class="docutils literal notranslate"><span class="pre">invoking.rst</span></code>:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">TERM</span><span class="o">=</span> |
| <span class="n">export</span> <span class="n">TERM</span> |
| <span class="n">nroff</span> <span class="o">-</span><span class="n">Tascii</span> <span class="o">-</span><span class="n">c</span> <span class="o">-</span><span class="n">man</span> <span class="n">src</span><span class="o">/</span><span class="n">iperf3</span><span class="mf">.1</span> <span class="o">|</span> <span class="n">ul</span> <span class="o">|</span> <span class="n">sed</span> <span class="s1">'s/^/ /'</span> <span class="o">></span> <span class="n">iperf3</span><span class="o">.</span><span class="n">txt</span> |
| </pre></div> |
| </div> |
| </li> |
| </ol> |
| </section> |
| <section id="code-authors"> |
| <h2>Code Authors<a class="headerlink" href="#code-authors" title="Link to this heading">¶</a></h2> |
| <p>The main authors of iperf3 are (in alphabetical order): Jon Dugan, |
| Seth Elliott, Bruce A. Mah, Jeff Poskanzer, Kaustubh Prabhu. |
| Additional code contributions have come from (also in alphabetical |
| order): Mark Ashley, Aaron Brown, Aeneas Jaißle, Susant Sahani, |
| Bruce Simpson, Brian Tierney.</p> |
| <p>iperf3 contains some original code from iperf2. The authors of iperf2 |
| are (in alphabetical order): Jon Dugan, John Estabrook, Jim Ferbuson, |
| Andrew Gallatin, Mark Gates, Kevin Gibbs, Stephen Hemminger, Nathan |
| Jones, Feng Qin, Gerrit Renker, Ajay Tirumala, Alex Warshavsky.</p> |
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