pangolin keeps polling - cpu is used #374

New Issue

MrUnknownDE · 2026-04-05T17:08:08+02:00

MrUnknownDE commented

2026-04-05 17:08:08 +02:00

Originally created by @BerndK-Str on 1/17/2026

Describe the Bug

While there is no traffic (also no blocked one) the cpu is constantly using about 5%
This is not a drama but maybe a chance of improvement.
I have no idea if this is by intention, if so, please close this issue.

Environment

OS Type & Version: Linux pangolin 6.17.2-2-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.2-2 (2025-11-26T12:33Z) x86_64 GNU/Linux (LXC on proxmox with docker containers)
Pangolin Version: 1.14.1
Gerbil Version: -
Traefik Version: v3.6.4
Newt Version: -
CrowdSec: no version found, latest (Jan 2026)

To Reproduce

top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
4757 root 20 0 17.3g 312572 38724 S 5.3 29.8 2:50.27 MainThread
123 root 20 0 1868244 39016 22620 S 0.3 3.7 0:05.17 containerd

note PID '4757' of process 'MainThread'

(apt install strace)

strace -tt -p 4757
strace: Process 4757 attached
09:33:10.183308 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.184519 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.184596 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.185804 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.185845 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.185909 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.187027 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.187114 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.188257 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.188323 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.189481 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
09:33:10.189547 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0
09:33:10.190705 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0
...

The 'AI' says: indication for busy-polling, the event loop never sleeps.

Expected Behavior

lower CPU when idle

*Originally created by @BerndK-Str on 1/17/2026* ### Describe the Bug While there is no traffic (also no blocked one) the cpu is constantly using about 5% This is not a drama but maybe a chance of improvement. I have no idea if this is by intention, if so, please close this issue. ### Environment - OS Type & Version: Linux pangolin 6.17.2-2-pve #1 SMP PREEMPT_DYNAMIC PMX 6.17.2-2 (2025-11-26T12:33Z) x86_64 GNU/Linux (LXC on proxmox with docker containers) - Pangolin Version: 1.14.1 - Gerbil Version: - - Traefik Version: v3.6.4 - Newt Version: - - CrowdSec: no version found, latest (Jan 2026) ### To Reproduce top PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4757 root 20 0 17.3g 312572 38724 S 5.3 29.8 2:50.27 MainThread 123 root 20 0 1868244 39016 22620 S 0.3 3.7 0:05.17 containerd note PID '4757' of process 'MainThread' (apt install strace) strace -tt -p 4757 strace: Process 4757 attached 09:33:10.183308 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.184519 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.184596 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.185804 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.185845 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.185909 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.187027 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.187114 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.188257 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.188323 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.189481 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 09:33:10.189547 epoll_pwait(13, [], 1024, 1, NULL, 8) = 0 09:33:10.190705 epoll_pwait(13, [], 1024, 0, NULL, 8) = 0 ... The 'AI' says: indication for busy-polling, the event loop never sleeps. ### Expected Behavior lower CPU when idle

MrUnknownDE added the enhancement label 2026-04-05 17:08:09 +02:00

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Reference: github/pangolin#374