new commit

networking/rss-irq-affinity-and-rps/index.html

@@ -3058,11 +3058,9 @@ <h3 id="identifying-and-reading-per-queue-interrupts">Identifying and reading pe
 <span class="w"> </span><span class="mi">57</span><span class="err">:</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">   </span><span class="mi">11296239</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">1</span><span class="w">          </span><span class="mi">0</span><span class="w">  </span><span class="n">PCI</span><span class="o">-</span><span class="n">MSIX</span><span class="o">-</span><span class="mi">0000</span><span class="err">:</span><span class="mi">07</span><span class="err">:</span><span class="mf">00.0</span><span class="w">   </span><span class="mi">5</span><span class="o">-</span><span class="n">edge</span><span class="w">      </span><span class="n">virtio6</span><span class="o">-</span><span class="k">input</span><span class="mf">.2</span>
 <span class="w"> </span><span class="mi">59</span><span class="err">:</span><span class="w">   </span><span class="mi">11620198</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">0</span><span class="w">          </span><span class="mi">2</span><span class="w">          </span><span class="mi">0</span><span class="w">  </span><span class="n">PCI</span><span class="o">-</span><span class="n">MSIX</span><span class="o">-</span><span class="mi">0000</span><span class="err">:</span><span class="mi">07</span><span class="err">:</span><span class="mf">00.0</span><span class="w">   </span><span class="mi">7</span><span class="o">-</span><span class="n">edge</span><span class="w">      </span><span class="n">virtio6</span><span class="o">-</span><span class="k">input</span><span class="mf">.3</span>
 </code></pre></div></td></tr></table></div>
-<h3 id="configuring-smp-affinity-for-rx-queue-interrupts">Configuring SMP affinity for RX queue interrupts</h3>
-<p>Next, let's move the SMP affinity for our queues' interrupts to CPUs 4 and 5. The softirqs will be processed on the same
-NICs by default.</p>
+<h3 id="querying-smp-affinity-for-rx-queue-interrupts">Querying SMP affinity for RX queue interrupts</h3>
 <p>You can get the interrupt numbers for virtio6-input.0 (in this case 53) and virtio6-input.1 (in this case 55) from
-/proc/interrupts.</p>
+/proc/interrupts. Then, query /proc/irq/<interrupt number>/smp_affinity and smp_affinity_list.</p>
 <div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
 <span class="normal">2</span>
 <span class="normal">3</span>
@@ -3084,9 +3082,11 @@ <h3 id="configuring-smp-affinity-for-rx-queue-interrupts">Configuring SMP affini
 it generated interrupts on CPU 5. But wait, irqbalance is switched off, and we even rebooted the system. Why are our
 IRQs distributed between our CPUs and why aren't they allowed on all CPUs? To be confirmed, but the answer may be in
 <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5e385a6ef31f">this commit</a>.</p>
-<p>Let's force virtio6-input.0 onto CPU 2 and virtio6-input.1 onto CPU 3. The affinity can be any CPU, regardless of our
-tuned configuration, either from the system CPU set or from the isolated CPU set. But I already moved IRQs to isolated
-CPUs during an earlier test, so for the sake of it, I want to move them to system reserved CPUs now :-)</p>
+<h3 id="configuring-smp-affinity-for-rx-queue-interrupts">Configuring SMP affinity for RX queue interrupts</h3>
+<p>Let's force virtio6-input.0 onto CPU 2 and virtio6-input.1 onto CPU 3. The softirqs will be processed on the same NICs
+by default. The affinity can be any CPU, regardless of our tuned configuration, either from the system CPU set or from
+the isolated CPU set. But I already moved IRQs to isolated CPUs during an earlier test, so for the sake of it, I want
+to move them to system reserved CPUs now :-)</p>
 <div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
 <span class="normal">2</span>
 <span class="normal">3</span>
@@ -3131,14 +3131,14 @@ <h2 id="using-flamegraphs-to-analyze-cpu-activity">Using flamegraphs to analyze
 <span class="p">(...</span><span class="w"> </span><span class="n">wait</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="o">&gt;</span><span class="w"> </span><span class="mi">5</span><span class="w"> </span><span class="n">seconds</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="p">...</span>
 </code></pre></div></td></tr></table></div>
 <p>Now, copy the flamegraphs to your local system for analysis. You can access the flamegraphs of my test runs here:
-<img alt="IRQ smp affinity - flamegraph 0" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.0/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 1" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.1/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 2" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.2/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 3" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.3/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 4" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.4/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 5" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.5/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 6" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.6/flamegraph.html" />
-<img alt="IRQ smp affinity - flamegraph 7" src="/src/rss-irq-affinity-and-rps/irq_smp_affinity.7/flamegraph.html" /></p>
+<img alt="IRQ smp affinity - flamegraph 0" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.0/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 1" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.1/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 2" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.2/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 3" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.3/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 4" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.4/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 5" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.5/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 6" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.6/flamegraph.html" />
+<img alt="IRQ smp affinity - flamegraph 7" src="../../src/rss-irq-affinity-and-rps/irq_smp_affinity.7/flamegraph.html" /></p>