[3.1.1 on EL8] CPU 100% with NetworkManager

[Jana Babovakova]

Hi Zhang,

could you please provide us with more information about your situation?
Could you send us your configuration file? What does your routing table 
look like? Are there any specific network events when BIRD complains?

Happy routing,
Jana

Jana Babovakova (she/her) | BIRD Tech Support | CZ.NIC, z.s.p.o.

On 02. 06. 25 11:31, zx at zxinc.org wrote:
> 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：zx at zxinc.org
> 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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