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<li class="toctree-l1"><a class="reference internal" href="recommendations.html">Recommendations</a></li>
<li class="toctree-l1 current"><a class="current reference internal" href="#">BRAS tuning</a><ul>
<li class="toctree-l2"><a class="reference internal" href="#network-tuning">Network tuning</a><ul>
<li class="toctree-l3"><a class="reference internal" href="#disable-kernel-mitigations-to-maximize-performance">Disable kernel mitigations to maximize performance</a></li>
<li class="toctree-l3"><a class="reference internal" href="#disable-nic-offloads">Disable NIC offloads</a></li>
<li class="toctree-l3"><a class="reference internal" href="#fix-download-speed-problem-shaper">Fix Download speed problem (shaper)</a></li>
<li class="toctree-l3"><a class="reference internal" href="#default-rate-limits-shaper">Default rate limits (shaper)</a></li>
<li class="toctree-l3"><a class="reference internal" href="#change-pppoe-mtu">Change PPPoE MTU</a></li>
<li class="toctree-l3"><a class="reference internal" href="#hotplug-optimization">Hotplug optimization</a></li>
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<section id="bras-tuning">
<h1>BRAS tuning<a class="headerlink" href="#bras-tuning" title="Link to this heading"></a></h1>
<p>Recommendations for BRAS (Broadband Remote Access Server) performance.</p>
<section id="network-tuning">
<h2>Network tuning<a class="headerlink" href="#network-tuning" title="Link to this heading"></a></h2>
<section id="disable-kernel-mitigations-to-maximize-performance">
<h3>Disable kernel mitigations to maximize performance<a class="headerlink" href="#disable-kernel-mitigations-to-maximize-performance" title="Link to this heading"></a></h3>
<p>Edit file <code class="docutils literal notranslate"><span class="pre">/etc/default/grub</span></code></p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">GRUB_CMDLINE_LINUX_DEFAULT</span><span class="o">=</span><span class="s2">"intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll quiet mitigations=off"</span>
</pre></div>
</div>
<p>Additional GRUB CMD arguments:</p>
<blockquote>
<div><ul class="simple">
<li><p>ixgbe.allow_unsupported_sfp=1 - Allow to use not original Intel SFP+ modules</p></li>
<li><p>pcie_aspm=off - Disable Active-State Power Management</p></li>
</ul>
</div></blockquote>
<p>After saving, please update grub settings</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">$sudo</span><span class="w"> </span>update-grub
</pre></div>
</div>
<p>Warning! Enabling the idle loop (<code class="docutils literal notranslate"><span class="pre">idle=poll</span></code>) parameter can cause 100% CPU utilization on your VM (if you’re using virtual enviroments like ProxMox, VMWare, etc.)</p>
</section>
<section id="disable-nic-offloads">
<h3>Disable NIC offloads<a class="headerlink" href="#disable-nic-offloads" title="Link to this heading"></a></h3>
<p>Disable hardware offloads,increase Tx/Rx buffers and queue length on your NICs to prevent speed problems.
Please note, that GSO offload changed to tx-gso-partial in Linux kernels 4.15 and later.</p>
<p>Debian <code class="docutils literal notranslate"><span class="pre">/etc/network/interfaces</span></code>:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>allow-hotplug<span class="w"> </span>eth0
iface<span class="w"> </span>eth0<span class="w"> </span>inet<span class="w"> </span>manual
<span class="w"> </span>up<span class="w"> </span>ethtool<span class="w"> </span>-K<span class="w"> </span>eth0<span class="w"> </span>tso<span class="w"> </span>off<span class="w"> </span>gso<span class="w"> </span>off<span class="w"> </span>gro<span class="w"> </span>off<span class="w"> </span>rxvlan<span class="w"> </span>off<span class="w"> </span>txvlan<span class="w"> </span>off<span class="w"> </span>rx-vlan-filter<span class="w"> </span>off<span class="w"> </span>ntuple<span class="w"> </span>on<span class="w"> </span><span class="p">&</span>><span class="w"> </span>/dev/null
<span class="w"> </span>up<span class="w"> </span>ethtool<span class="w"> </span>-K<span class="w"> </span>eth0<span class="w"> </span>tx-gso-partial<span class="w"> </span>off<span class="w"> </span><span class="p">&</span>><span class="w"> </span>/dev/null
<span class="w"> </span>up<span class="w"> </span>ethtool<span class="w"> </span>-G<span class="w"> </span>eth0<span class="w"> </span>rx<span class="w"> </span><span class="m">4096</span><span class="w"> </span>tx<span class="w"> </span><span class="m">4096</span><span class="w"> </span><span class="p">&</span>><span class="w"> </span>/dev/null
<span class="w"> </span>up<span class="w"> </span>ip<span class="w"> </span>link<span class="w"> </span><span class="nb">set</span><span class="w"> </span>eth0<span class="w"> </span>txqueuelen<span class="w"> </span><span class="m">10000</span><span class="w"> </span><span class="p">&</span>><span class="w"> </span>/dev/null
</pre></div>
</div>
<p>Please determine your NIC queue and buffers limit before increase:</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>ethtool<span class="w"> </span>-g<span class="w"> </span>eth0
</pre></div>
</div>
</section>
<section id="fix-download-speed-problem-shaper">
<h3>Fix Download speed problem (shaper)<a class="headerlink" href="#fix-download-speed-problem-shaper" title="Link to this heading"></a></h3>
<p>Change shaper from htb to tbf</p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="o">[</span>shaper<span class="o">]</span>
…
down-limiter<span class="o">=</span>tbf
</pre></div>
</div>
</section>
<section id="default-rate-limits-shaper">
<h3>Default rate limits (shaper)<a class="headerlink" href="#default-rate-limits-shaper" title="Link to this heading"></a></h3>
<p>If radius-server Access-Accept answer has no compatible speed attributes - to prevent unlimited session speed you can add default rate-limits (in Kbps).</p>
<p><code class="docutils literal notranslate"><span class="pre">nano</span> <span class="pre">/etc/accel-ppp.conf</span></code></p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="o">[</span>shaper<span class="o">]</span>
rate-limit<span class="o">=</span><span class="m">888</span>/888
</pre></div>
</div>
</section>
<section id="change-pppoe-mtu">
<h3>Change PPPoE MTU<a class="headerlink" href="#change-pppoe-mtu" title="Link to this heading"></a></h3>
<p>You can adjust allowed PPPoE min/max MTU/MRU settings:
<code class="docutils literal notranslate"><span class="pre">nano</span> <span class="pre">/etc/accel-ppp.conf</span></code></p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="o">[</span>ppp<span class="o">]</span>
<span class="nv">verbose</span><span class="o">=</span><span class="m">1</span>
min-mtu<span class="o">=</span><span class="m">1280</span>
<span class="nv">mtu</span><span class="o">=</span><span class="m">1492</span>
<span class="nv">mru</span><span class="o">=</span><span class="m">1492</span>
</pre></div>
</div>
</section>
<section id="hotplug-optimization">
<h3>Hotplug optimization<a class="headerlink" href="#hotplug-optimization" title="Link to this heading"></a></h3>
<p>To generate hotplug events on IPoE interfaces (Debian 10):</p>
<p><code class="docutils literal notranslate"><span class="pre">nano</span> <span class="pre">/lib/udev/ifupdown-hotplug</span></code></p>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="k">case</span><span class="w"> </span><span class="s2">"</span><span class="nv">$ACTION</span><span class="s2">"</span><span class="w"> </span><span class="k">in</span>
add<span class="o">)</span>
<span class="c1"># these interfaces generate hotplug events *after* they are brought up</span>
<span class="k">case</span><span class="w"> </span><span class="nv">$INTERFACE</span><span class="w"> </span><span class="k">in</span>
<span class="w"> </span>ppp*<span class="p">|</span>ippp*<span class="p">|</span>isdn*<span class="p">|</span>plip*<span class="p">|</span>lo<span class="p">|</span>irda*<span class="p">|</span>ipsec*
</pre></div>
</div>
<p>just add <code class="docutils literal notranslate"><span class="pre">|ipoe*</span></code> after <code class="docutils literal notranslate"><span class="pre">|ipsec*</span></code></p>
<p>repeat with file <code class="docutils literal notranslate"><span class="pre">/lib/udev/net.agent</span></code></p>
</section>
<section id="systemd-udev-optimizations">
<h3>SYSTEMD-UDEV optimizations<a class="headerlink" href="#systemd-udev-optimizations" title="Link to this heading"></a></h3>
<ol class="arabic simple">
<li><p>Delete <code class="docutils literal notranslate"><span class="pre">99-default.link</span></code> from <code class="docutils literal notranslate"><span class="pre">/lib/systemd/network/</span></code> directory</p></li>
</ol>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>rm<span class="w"> </span>/lib/systemd/network/99-default.link
</pre></div>
</div>
<ol class="arabic simple" start="2">
<li><p>Change <code class="docutils literal notranslate"><span class="pre">/lib/udev/rules.d/99-systemd.rules</span></code></p></li>
</ol>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">ACTION</span><span class="o">==</span><span class="s2">"add"</span>,<span class="w"> </span><span class="nv">SUBSYSTEM</span><span class="o">==</span><span class="s2">"net"</span>,<span class="w"> </span>KERNEL!<span class="o">=</span><span class="s2">"lo|ppp*|ipoe*"</span>,<span class="w"> </span><span class="nv">RUN</span><span class="o">+=</span><span class="s2">"/lib/systemd/systemd-sysctl --prefix=/net/ipv4/conf/</span><span class="nv">$name</span><span class="s2"> --prefix=/net/ipv4/neigh/</span><span class="nv">$name</span><span class="s2"> --prefix=/net/ipv6/conf/</span><span class="nv">$name</span><span class="s2"> --prefix=/net/ipv6/neigh/</span><span class="nv">$name</span><span class="s2">"</span>
</pre></div>
</div>
<p>Add <code class="docutils literal notranslate"><span class="pre">|ppp*|ipoe*</span></code> to <code class="docutils literal notranslate"><span class="pre">KERNEL!="lo"</span></code></p>
<ol class="arabic simple" start="3">
<li><p>Change <code class="docutils literal notranslate"><span class="pre">/lib/udev/rules.d/80-ifupdown.rules</span></code></p></li>
</ol>
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span><span class="nv">SUBSYSTEM</span><span class="o">==</span><span class="s2">"net"</span>,<span class="w"> </span><span class="nv">ACTION</span><span class="o">==</span><span class="s2">"add|remove"</span>,<span class="w"> </span>KERNEL!<span class="o">=</span><span class="s2">"ppp*|ipoe*"</span>,<span class="w"> </span><span class="nv">RUN</span><span class="o">+=</span><span class="s2">"ifupdown-hotplug"</span>
</pre></div>
</div>
<p>Add <code class="docutils literal notranslate"><span class="pre">KERNEL!="ppp*|ipoe*"</span></code></p>
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