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<a href="https://gitlab.rtems.org/zhugengyu2023">geng zhu</a> created an issue: <a href="https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/52">#52</a>
</p>
<div class="md" style="position: relative; z-index: 1; color: #3a383f; word-wrap: break-word;">
<h2 dir="auto" style="margin-top: 0; margin-bottom: 10px;" align="initial">
<a href="#summary" aria-hidden="true" class="anchor" id="user-content-summary" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Summary</h2>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Hello everyone,</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I am currently conducting tests on RTEMS 6.1 in conjunction with rtems - libbsd 6.1 and FreeBSD - 14. During the testing process, I've encountered some issues when using the SMP (Symmetric Multi - Processing) mode of libbsd.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial"><a class="no-attachment-icon gfm" href="https://gitlab.rtems.org/-/project/13/uploads/796692e7f9148dbeb49565bd38356a6a/image.png" target="_blank" rel="noopener noreferrer" data-canonical-src="/uploads/796692e7f9148dbeb49565bd38356a6a/image.png" data-link="true" style="margin-top: 0;"><img src="https://gitlab.rtems.org/-/project/13/uploads/796692e7f9148dbeb49565bd38356a6a/image.png" alt="image" width="819" height="296" data-canonical-src="/uploads/796692e7f9148dbeb49565bd38356a6a/image.png" class="gfm" style="max-width: 100%; height: auto; margin-top: 0; vertical-align: baseline; object-fit: contain; object-position: top;"></a></p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The UP (Uniprocessor) mode of libbsd functions quite smoothly. However, when it comes to the SMP mode, specifically on a 4 - core system (comprising two little cores and two big cores), I've identified two problems:</p>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0 0 1rem; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<ol style="margin: 0; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Occasionally, the shell fails to start during the system boot - up process.</li>
</ol>
</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<ol start="2" style="margin: 0; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">After a continuous flood of ping requests (approximately after 8000 packets), ping echoes start to get lost. Additionally, the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;'>cgem_tick</code> function (which runs in the TIME task) fails to execute.</li>
</ol>
</li>
</ul>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">It appears that there are conflicts between the interrupt tasks running on Core 0 and the Shell/Timer tasks. After binding both the Shell task and the Timer task to Core 1, the aforementioned two issues seem to have disappeared.</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="c" style="margin-top: 0;"><span class="kt" style="margin-top: 0;">void</span> <span class="nf">rtems_shell_usr_set</span> <span class="p">(</span></span>
<span id="LC2" class="line" lang="c"> <span class="kt" style="margin-top: 0;">void</span></span>
<span id="LC3" class="line" lang="c"><span class="p" style="margin-top: 0;">)</span></span>
<span id="LC4" class="line" lang="c"><span class="p" style="margin-top: 0;">{</span></span>
<span id="LC5" class="line" lang="c"><span class="cp" style="margin-top: 0;">#if (CONFIGURE_MAXIMUM_PROCESSORS > 1)</span></span>
<span id="LC6" class="line" lang="c"> <span class="n" style="margin-top: 0;">cpu_set_t</span> <span class="n">cpu_set</span><span class="p">;</span></span>
<span id="LC7" class="line" lang="c"> <span class="n" style="margin-top: 0;">CPU_ZERO</span><span class="p">(</span><span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC8" class="line" lang="c"> <span class="n" style="margin-top: 0;">CPU_SET</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC9" class="line" lang="c"> <span class="n" style="margin-top: 0;">rtems_status_code</span> <span class="n">sc</span> <span class="o">=</span> <span class="n">rtems_task_set_affinity</span><span class="p">(</span><span class="n">RTEMS_SELF</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">cpu_set</span><span class="p">),</span> <span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC10" class="line" lang="c"> <span class="k" style="margin-top: 0;">if</span> <span class="p">(</span><span class="n">sc</span> <span class="o">!=</span> <span class="n">RTEMS_SUCCESSFUL</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC11" class="line" lang="c"> <span class="n" style="margin-top: 0;">printf</span><span class="p">(</span><span class="s">"Failed to set task affinity: %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">sc</span><span class="p">);</span></span>
<span id="LC12" class="line" lang="c"> <span class="p" style="margin-top: 0;">}</span> <span class="k">else</span> <span class="p">{</span></span>
<span id="LC13" class="line" lang="c"> <span class="n" style="margin-top: 0;">printf</span><span class="p">(</span><span class="s">"Shell task affinity set to CPU 1</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC14" class="line" lang="c"> <span class="p" style="margin-top: 0;">}</span></span>
<span id="LC15" class="line" lang="c"><span class="cp" style="margin-top: 0;">#endif</span></span>
<span id="LC16" class="line" lang="c"><span class="p" style="margin-top: 0;">}</span></span>
<span id="LC17" class="line" lang="c"></span>
<span id="LC18" class="line" lang="c"><span class="k" style="margin-top: 0;">static</span> <span class="n">rtems_task</span> <span class="nf">rtems_shell_task</span><span class="p">(</span><span class="n">rtems_task_argument</span> <span class="n">task_argument</span><span class="p">)</span></span>
<span id="LC19" class="line" lang="c"><span class="p" style="margin-top: 0;">{</span></span>
<span id="LC20" class="line" lang="c"> <span class="n" style="margin-top: 0;">rtems_shell_usr_set</span> <span class="p">();</span></span>
<span id="LC21" class="line" lang="c"> <span class="p" style="margin-top: 0;">...</span></span>
<span id="LC22" class="line" lang="c"><span class="p" style="margin-top: 0;">}</span></span>
<span id="LC23" class="line" lang="c"></span>
<span id="LC24" class="line" lang="c"><span class="kt" style="margin-top: 0;">void</span> <span class="nf">rtems_timer_usr_set</span> <span class="p">(</span></span>
<span id="LC25" class="line" lang="c"> <span class="kt" style="margin-top: 0;">void</span></span>
<span id="LC26" class="line" lang="c"><span class="p" style="margin-top: 0;">)</span></span>
<span id="LC27" class="line" lang="c"><span class="p" style="margin-top: 0;">{</span></span>
<span id="LC28" class="line" lang="c"><span class="cp" style="margin-top: 0;">#if (CONFIGURE_MAXIMUM_PROCESSORS > 1)</span></span>
<span id="LC29" class="line" lang="c"> <span class="n" style="margin-top: 0;">cpu_set_t</span> <span class="n">cpu_set</span><span class="p">;</span></span>
<span id="LC30" class="line" lang="c"> <span class="n" style="margin-top: 0;">CPU_ZERO</span><span class="p">(</span><span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC31" class="line" lang="c"> <span class="n" style="margin-top: 0;">CPU_SET</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC32" class="line" lang="c"> <span class="n" style="margin-top: 0;">rtems_status_code</span> <span class="n">sc</span> <span class="o">=</span> <span class="n">rtems_task_set_affinity</span><span class="p">(</span><span class="n">RTEMS_SELF</span><span class="p">,</span> <span class="k">sizeof</span><span class="p">(</span><span class="n">cpu_set</span><span class="p">),</span> <span class="o">&</span><span class="n">cpu_set</span><span class="p">);</span></span>
<span id="LC33" class="line" lang="c"> <span class="k" style="margin-top: 0;">if</span> <span class="p">(</span><span class="n">sc</span> <span class="o">!=</span> <span class="n">RTEMS_SUCCESSFUL</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC34" class="line" lang="c"> <span class="n" style="margin-top: 0;">printf</span><span class="p">(</span><span class="s">"Failed to set task affinity: %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">sc</span><span class="p">);</span></span>
<span id="LC35" class="line" lang="c"> <span class="p" style="margin-top: 0;">}</span> <span class="k">else</span> <span class="p">{</span></span>
<span id="LC36" class="line" lang="c"> <span class="n" style="margin-top: 0;">printf</span><span class="p">(</span><span class="s">"Timer task affinity set to CPU 1</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC37" class="line" lang="c"> <span class="p" style="margin-top: 0;">}</span></span>
<span id="LC38" class="line" lang="c"><span class="cp" style="margin-top: 0;">#endif</span></span>
<span id="LC39" class="line" lang="c"><span class="p" style="margin-top: 0;">}</span></span>
<span id="LC40" class="line" lang="c"></span>
<span id="LC41" class="line" lang="c"><span class="k" style="margin-top: 0;">static</span> <span class="n">rtems_task</span> <span class="nf">_Timer_server_Body</span><span class="p">(</span></span>
<span id="LC42" class="line" lang="c"> <span class="n" style="margin-top: 0;">rtems_task_argument</span> <span class="n">arg</span></span>
<span id="LC43" class="line" lang="c"><span class="p" style="margin-top: 0;">)</span></span>
<span id="LC44" class="line" lang="c"><span class="p" style="margin-top: 0;">{</span></span>
<span id="LC45" class="line" lang="c"> <span class="n" style="margin-top: 0;">rtems_timer_usr_set</span><span class="p">();</span></span>
<span id="LC46" class="line" lang="c"> <span class="p" style="margin-top: 0;">...</span></span>
<span id="LC47" class="line" lang="c"><span class="p" style="margin-top: 0;">}</span></span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
</div>
<h2 dir="auto" style="margin-top: 20px; margin-bottom: 10px;" align="initial">
<a href="#steps-to-reproduce" aria-hidden="true" class="anchor" id="user-content-steps-to-reproduce" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Steps to reproduce</h2>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0 0 1rem; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Enable 4 - core SMP on an AARCH64 BSP.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Utilize the pl011 UART with a polling shell.</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Employ the if_cgem network and perform a flood ping to the RTEMS system.</li>
</ul>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;"># task</span>
<span id="LC2" class="line" lang="plaintext">[>0qID NAME SHED PRI STATE MODES EVENTS WAITINFO</span>
<span id="LC3" class="line" lang="plaintext">------------------------------------------------------------------------------</span>
<span id="LC4" class="line" lang="plaintext">0a010001 UI1 MEDF 2147483646 EV P:T:nA NONE </span>
<span id="LC5" class="line" lang="plaintext">0a010002 BSWP MEDF 105 EV P:T:nA NONE </span>
<span id="LC6" class="line" lang="plaintext">0a010003 MDIA MEDF 200 EV P:T:nA NONE </span>
<span id="LC7" class="line" lang="plaintext">0a010004 USBR MEDF 2147483636 MSG P:T:nA NONE 22010002</span>
<span id="LC8" class="line" lang="plaintext">0a010005 USBO MEDF 2147483635 MSG P:T:nA NONE 22010001</span>
<span id="LC9" class="line" lang="plaintext">0a010006 USBR MEDF 2147483636 MSG P:T:nA NONE 22010004</span>
<span id="LC10" class="line" lang="plaintext">0a010007 USBO MEDF 2147483635 MSG P:T:nA NONE 22010003</span>
<span id="LC11" class="line" lang="plaintext">0a010008 TIME MEDF 98 SYSEV P:T:nA NONE </span>
<span id="LC12" class="line" lang="plaintext">0a010009 IRQS MEDF 96 SYSEV P:T:nA NONE </span>
<span id="LC13" class="line" lang="plaintext">0a01000a IRQS MEDF 96 SYSEV P:T:nA NONE </span>
<span id="LC14" class="line" lang="plaintext">0a01000b IRQS MEDF 96 SYSEV P:T:nA NONE </span>
<span id="LC15" class="line" lang="plaintext">0a01000c IRQS MEDF 96 SYSEV P:T:nA NONE </span>
<span id="LC16" class="line" lang="plaintext">0a01000d _BSD kqueue_ctx task MEDF 100 WK P:T:nA NONE -</span>
<span id="LC17" class="line" lang="plaintext">0a01000e _BSD swi5: fast task MEDF 100 EV P:T:nA NONE </span>
<span id="LC18" class="line" lang="plaintext">0a01000f _BSD thread taskq MEDF 100 WK P:T:nA NONE -</span>
<span id="LC19" class="line" lang="plaintext">0a010010 _BSD swi6: Giant tas MEDF 100 EV P:T:nA NONE </span>
<span id="LC20" class="line" lang="plaintext">0a010011 _BSD swi6: task queu MEDF 100 EV P:T:nA NONE </span>
<span id="LC21" class="line" lang="plaintext">0a010012 _BSD inm_free taskq MEDF 100 WK P:T:nA NONE -</span>
<span id="LC22" class="line" lang="plaintext">0a010013 _BSD in6m_free taskq MEDF 100 WK P:T:nA NONE -</span>
<span id="LC23" class="line" lang="plaintext">0a010014 _BSD deferred_unmoun MEDF 100 WK P:T:nA NONE -</span>
<span id="LC24" class="line" lang="plaintext">0a010015 _BSD swi1: netisr 0 MEDF 100 EV P:T:nA NONE </span>
<span id="LC25" class="line" lang="plaintext">0a010016 _BSD usbus0 MEDF 100 WK P:T:nA NONE -</span>
<span id="LC26" class="line" lang="plaintext">0a010017 _BSD usbus0 MEDF 100 WK P:T:nA NONE -</span>
<span id="LC27" class="line" lang="plaintext">0a010018 _BSD usbus0 MEDF 100 WK P:T:nA NONE -</span>
<span id="LC28" class="line" lang="plaintext">0a010019 _BSD usbus0 MEDF 100 WK P:T:nA NONE WCTRL</span>
<span id="LC29" class="line" lang="plaintext">0a01001a _BSD usbus0 MEDF 100 READY P:T:nA NONE </span>
<span id="LC30" class="line" lang="plaintext">0a01001b _BSD bufdaemon MEDF 100 WK P:T:nA NONE psleep</span>
<span id="LC31" class="line" lang="plaintext">0a01001c _BSD syncer MEDF 100 WK P:T:nA NONE syncer</span>
<span id="LC32" class="line" lang="plaintext">0a01001d _BSD vnlru MEDF 100 WK P:T:nA NONE vlruwt</span>
<span id="LC33" class="line" lang="plaintext">0a01001e _BSD bufspacedaemon- MEDF 100 WK P:T:nA NONE -</span>
<span id="LC34" class="line" lang="plaintext">0a01001f TNTa MEDF 100 SYSEV P:T:nA NONE </span>
<span id="LC35" class="line" lang="plaintext">0a010020 TNTb MEDF 100 SYSEV P:T:nA NONE </span>
<span id="LC36" class="line" lang="plaintext">0a010021 TNTc MEDF 100 SYSEV P:T:nA NONE </span>
<span id="LC37" class="line" lang="plaintext">0a010022 TNTd MEDF 100 SYSEV P:T:nA NONE </span>
<span id="LC38" class="line" lang="plaintext">0a010023 TNTe MEDF 100 SYSEV P:T:nA NONE </span>
<span id="LC39" class="line" lang="plaintext">0a010024 TNTD MEDF 100 WK P:T:nA NONE accept</span>
<span id="LC40" class="line" lang="plaintext">0a010025 SHLL MEDF 150 READY P:T:nA NONE </span></code></pre>
<copy-code></copy-code><insert-code-snippet></insert-code-snippet>
</div>
<h3 dir="auto" style="margin-top: 1.5rem; margin-bottom: 0; font-weight: 600; font-size: 1.125rem; letter-spacing: inherit; line-height: 1.25; color: #18171d;" align="initial">
<a href="#pre---set-options" aria-hidden="true" class="anchor" id="user-content-pre---set-options" style="margin-top: 0; margin-left: -20px; text-decoration: none; outline: none; position: absolute; width: 20px;"></a>Pre - set options</h3>
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