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Hi Zhang, <br>
<br>
could you please provide us with more information about your
situation?<br>
Could you send us your configuration file? What does your routing
table look like? Are there any specific network events when BIRD
complains?<br>
<br>
Happy routing, <br>
Jana<br>
<pre class="moz-signature" cols="72">Jana Babovakova (she/her) | BIRD Tech Support | CZ.NIC, z.s.p.o.
</pre>
<div class="moz-cite-prefix">On 02. 06. 25 11:31, <a class="moz-txt-link-abbreviated" href="mailto:zx@zxinc.org">zx@zxinc.org</a>
wrote:<br>
</div>
<blockquote type="cite" cite="mid:2025060217315462330931@zxinc.org">
<pre wrap="" class="moz-quote-pre">bird 3.1.2 seems to be far better, but still about half minutes high CPU usage:
6月 02 17:27:52 zx-router bird[2232668]: I/O loop cycle took 7108.812 ms for 26 events
6月 02 17:28:11 zx-router bird[2232668]: I/O loop cycle took 5419.657 ms for 15 events
6月 02 17:28:17 zx-router bird[2232668]: I/O loop cycle took 5445.657 ms for 80 events
it's still worse comparing with 2.16.2.
Zhang Xun
发件人： <a class="moz-txt-link-abbreviated" href="mailto:zx@zxinc.org">zx@zxinc.org</a>
发送时间： 2025-06-02 17:11
收件人： bird-users
主题： [3.1.1 on EL8] CPU 100% with NetworkManager
Hi there,
When I upgrade bird from 2.16.2 to 3.1.1 today, it became unstable that it often causes CPU usage to 100% for bird,
and later also for NetworkManager, and there are some notable syslogs:
6月 02 16:04:28 zx-router bird[2197971]: I/O loop cycle took 14046.255 ms for 43 events
6月 02 16:04:48 zx-router bird[2197971]: I/O loop cycle took 15307.277 ms for 42 events
6月 02 16:04:57 zx-router bird[2197971]: I/O loop cycle took 8562.921 ms for 43 events
6月 02 16:05:16 zx-router bird[2197971]: I/O loop cycle took 9799.271 ms for 85 events
6月 02 16:05:25 zx-router bird[2197971]: I/O loop cycle took 9330.265 ms for 80 events
6月 02 16:05:30 zx-router bird[2197971]: I/O loop cycle took 5004.867 ms for 44 events
6月 02 16:06:09 zx-router bird[2197971]: I/O loop cycle took 38759.438 ms for 84 events
6月 02 16:06:17 zx-router bird[2197971]: I/O loop cycle took 5465.396 ms for 6 events
6月 02 16:06:23 zx-router bird[2197971]: I/O loop cycle took 5906.858 ms for 44 events
6月 02 16:06:37 zx-router bird[2197971]: I/O loop cycle took 12896.032 ms for 9 events
6月 02 16:06:56 zx-router bird[2197971]: I/O loop cycle took 8217.969 ms for 81 events
6月 02 16:07:08 zx-router bird[2197971]: I/O loop cycle took 9012.775 ms for 25 events
6月 02 16:07:26 zx-router bird[2197971]: I/O loop cycle took 11506.570 ms for 45 events
6月 02 16:07:56 zx-router bird[2197971]: I/O loop cycle took 30014.580 ms for 85 events
6月 02 16:08:05 zx-router bird[2197971]: I/O loop cycle took 6333.289 ms for 6 events
6月 02 16:08:14 zx-router bird[2197971]: I/O loop cycle took 8751.816 ms for 42 events
6月 02 16:08:29 zx-router bird[2197971]: I/O loop cycle took 13017.064 ms for 46 events
6月 02 16:08:51 zx-router bird[2197971]: I/O loop cycle took 13223.357 ms for 80 events
6月 02 16:09:44 zx-router bird[2197971]: I/O loop cycle took 17730.328 ms for 5 events
6月 02 16:10:37 zx-router bird[2197971]: I/O loop cycle took 8061.950 ms for 8 events
6月 02 16:10:46 zx-router bird[2197971]: I/O loop cycle took 9008.065 ms for 65 events
6月 02 16:10:54 zx-router bird[2197971]: I/O loop cycle took 6035.965 ms for 4 events
6月 02 16:11:03 zx-router bird[2197971]: I/O loop cycle took 9959.243 ms for 67 events
I'm exporting full table to kernel with NetworkManager running on RHEL8 related systems (CentOS/Alma/Rocky 8).
There is no problem before upgrading.
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