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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/opticron">Kinsey Moore</a>
<a href="https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/14#note_115436">commented</a>:
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Upon further investigation, this message is produced on the non-SMP QEMU instance:
<code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>[zone: mbuf_cluster] kern.ipc.nmbclusters limit reached</code></p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>netstat -m</code> for non-SMP QEMU yields:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; 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; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; 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; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">1151/134/1285 mbufs in use (current/cache/total)</span>
<span id="LC2" class="line" lang="plaintext">1024/0/1024/1024 mbuf clusters in use (current/cache/total/max)</span>
<span id="LC3" class="line" lang="plaintext">1024/0 mbuf+clusters out of packet secondary zone in use (current/cache)</span>
<span id="LC4" class="line" lang="plaintext">0/0/0/512 4k (page size) jumbo clusters in use (current/cache/total/max)</span>
<span id="LC5" class="line" lang="plaintext">0/0/0/151 9k jumbo clusters in use (current/cache/total/max)</span>
<span id="LC6" class="line" lang="plaintext">0/0/0/85 16k jumbo clusters in use (current/cache/total/max)</span>
<span id="LC7" class="line" lang="plaintext">2335K/33K/2369K bytes allocated to network (current/cache/total)</span>
<span id="LC8" class="line" lang="plaintext">0/2/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)</span>
<span id="LC9" class="line" lang="plaintext">0/1/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)</span>
<span id="LC10" class="line" lang="plaintext">0/0/0 requests for jumbo clusters delayed (4k/9k/16k)</span>
<span id="LC11" class="line" lang="plaintext">0/0/0 requests for jumbo clusters denied (4k/9k/16k)</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>netstat -m</code> for SMP QEMU yields:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; 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; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; 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; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">1109/271/1380 mbufs in use (current/cache/total)</span>
<span id="LC2" class="line" lang="plaintext">1031/95/1126/1274 mbuf clusters in use (current/cache/total/max)</span>
<span id="LC3" class="line" lang="plaintext">1031/94 mbuf+clusters out of packet secondary zone in use (current/cache)</span>
<span id="LC4" class="line" lang="plaintext">0/0/0/762 4k (page size) jumbo clusters in use (current/cache/total/max)</span>
<span id="LC5" class="line" lang="plaintext">0/0/0/401 9k jumbo clusters in use (current/cache/total/max)</span>
<span id="LC6" class="line" lang="plaintext">0/0/0/335 16k jumbo clusters in use (current/cache/total/max)</span>
<span id="LC7" class="line" lang="plaintext">2339K/257K/2597K bytes allocated to network (current/cache/total)</span>
<span id="LC8" class="line" lang="plaintext">0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)</span>
<span id="LC9" class="line" lang="plaintext">0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters)</span>
<span id="LC10" class="line" lang="plaintext">0/0/0 requests for jumbo clusters delayed (4k/9k/16k)</span>
<span id="LC11" class="line" lang="plaintext">0/0/0 requests for jumbo clusters denied (4k/9k/16k)</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial"><code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; vertical-align: bottom; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>netstat -m</code> for non-SMP ZCU102 yields:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #28272d; 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; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; 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; vertical-align: bottom; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">280/230/510 mbufs in use (current/cache/total) </span>
<span id="LC2" class="line" lang="plaintext">263/113/376/1024 mbuf clusters in use (current/cache/total/max) </span>
<span id="LC3" class="line" lang="plaintext">263/112 mbuf+clusters out of packet secondary zone in use (current/cache) </span>
<span id="LC4" class="line" lang="plaintext">0/0/0/512 4k (page size) jumbo clusters in use (current/cache/total/max) </span>
<span id="LC5" class="line" lang="plaintext">0/0/0/151 9k jumbo clusters in use (current/cache/total/max) </span>
<span id="LC6" class="line" lang="plaintext">0/0/0/85 16k jumbo clusters in use (current/cache/total/max) </span>
<span id="LC7" class="line" lang="plaintext">596K/283K/879K bytes allocated to network (current/cache/total) </span>
<span id="LC8" class="line" lang="plaintext">0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) </span>
<span id="LC9" class="line" lang="plaintext">0/0/0 requests for mbufs delayed (mbufs/clusters/mbuf+clusters) </span>
<span id="LC10" class="line" lang="plaintext">0/0/0 requests for jumbo clusters delayed (4k/9k/16k) </span>
<span id="LC11" class="line" lang="plaintext">0/0/0 requests for jumbo clusters denied (4k/9k/16k)</span></code></pre>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">This appears to be partially caused by QEMU indicating the MII busses on all interfaces are active and so LibBSD brings up all interfaces. On hardware, interfaces with non-terminated MII busses are not brought up. It also appears that there are slightly more mbuf clusters available on SMP builds since this particular test is not configured to bring up additional cores.</p>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">Given the above, this is technically a configuration issue.</p>
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