Is this the right place for my bug report?
Presumably, because kworker is kernel related.

Describe the bug
In short words: The kworker processes consume to much CPU with newer kernels 5.10.x using wifi

After updating my Raspberry PI 1B and 3B from kernel 5.4.83 to the newer kernel 5.10.x the kworker processes continuously consumes more than 1,5% CPU (on Raspberry 3b) and more than 3% CPU on Raspberry 1B and load does not go to 0 anymore although the system has nothing to do (should be idle).

I found out that the problems occures only while using wlan (wifi). When using lan with eth0 the load goes down to 0.00 again.
I found a workaround for using the wlan and beeing not connected to the lan. When I take down eth0 with
/sbin/ifconfig eth0 down
then the kworker process calms down and the load goes to zero again.

To easily reproduce the problem I can bring eth0 up with
/sbin/ifconfig eth0 up

Then the kworker starts consuming CPU again. My Raspberry 1b shows e.g.

top - 10:48:30 up 12 days, 13:39,  1 user,  load average: 0.73, 0.34, 0.19
Tasks:  76 total,   1 running,  75 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.7 us,  3.4 sy,  0.0 ni, 95.2 id,  0.0 wa,  0.0 hi,  0.7 si,  0.0 st
MiB Mem :    477.6 total,    146.7 free,     86.8 used,    244.1 buff/cache
MiB Swap:    100.0 total,    100.0 free,      0.0 used.    317.5 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
 7829 root      20   0       0      0      0 D   3.9   0.0   0:04.90 kworker/0:2+events_power_efficient
 7831 roland    20   0   10188   3008   2524 R   1.6   0.6   0:00.16 top
 6905 root      20   0       0      0      0 I   0.3   0.0   0:14.43 kworker/u2:2-phy0
 7813 roland    20   0   12188   4188   3392 S   0.3   0.9   0:00.18 sshd
 7830 root      20   0       0      0      0 I   0.3   0.0   0:00.04 kworker/0:4-events
    1 root      20   0   33700   8072   6420 S   0.0   1.7   1:38.99 systemd
    2 root      20   0       0      0      0 S   0.0   0.0   0:00.84 kthreadd

Then after taking eth0 down the kworker process does not consume CPU
/sbin/ifconfig eth0 down
=> afterwards top shows e.g.:

top - 10:52:46 up 12 days, 13:43,  1 user,  load average: 0.17, 0.24, 0.18
Tasks:  75 total,   1 running,  74 sleeping,   0 stopped,   0 zombie
%Cpu(s):   1.0/1.3     2[||                                                                                                  ]
MiB Mem :    477.6 total,    146.6 free,     86.9 used,    244.2 buff/cache
MiB Swap:    100.0 total,    100.0 free,      0.0 used.    317.4 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
  476 mysql     20   0  718184  66124  15108 S   0.0  13.5  50:46.06 mysqld
    9 root      20   0       0      0      0 S   0.0   0.0   4:30.50 ksoftirqd/0
  477 root      20   0  211308  23776  19128 S   0.0   4.9   3:15.12 apache2
   18 root      20   0       0      0      0 S   0.0   0.0   2:11.88 kcompactd0
    1 root      20   0   33700   8072   6420 S   0.0   1.7   1:38.99 systemd
   97 root      20   0   35512   8452   7600 S   0.0   1.7   0:46.70 systemd-journal

To reproduce you can switch on and of the kworker CPU consumption with
/sbin/ifconfig eth0 up
and
/sbin/ifconfig eth0 down

Actual behaviour
After booting the raspberry PIs using Wifi the kworker processes always consumes CPU.

Expected behaviour
It would be great if the kworker processes are calm without the need to call "/sbin/ifconfig eth0 down"

System
My systems are a Raspberry PI 1B and a Raspberry Pi 3B (32 and 64 Bit Raspbian) with kernel from 5.10.x. The older 5.4 kernel did not have this problem.
Here an example from the Raspberry PI 1B:
cat /etc/rpi-issue
Raspberry Pi reference 2019-09-26
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, 80d486687ea77d31fc3fc13cf3a2f8b464e129be, stage2

uname -a
Linux antares 5.10.63+ #1488 Thu Nov 18 16:14:04 GMT 2021 armv6l GNU/Linux

Firmware version (vcgencmd version)
Dec 1 2021 15:07:23
Copyright (c) 2012 Broadcom
version 71bd3109023a0c8575585ba87cbb374d2eeb038f (clean) (release) (start_cd)

CPU:
/proc/cpuinfo
=>
processor : 0
model name : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS : 697.95
Features : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x0
CPU part : 0xb76
CPU revision : 7

Hardware : BCM2835
Revision : 100000e
Serial : 00000000894b0b9f
Model : Raspberry Pi Model B Rev 2

Now Raspberry PI 3b e.g. in 64 Bit mode:
cat /etc/rpi-issue
Raspberry Pi reference 2021-10-30
Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, c12b1df4ed6416fb0df33ba1731c5b13c1bdbdf8, stage2

kernel:
uname -a
Linux wega 5.10.63-v8+ #1488 SMP PREEMPT Thu Nov 18 16:16:16 GMT 2021 aarch64 GNU/Linux

firmware:
Nov 18 2021 16:18:09
Copyright (c) 2012 Broadcom
version d9b293558b4cef6aabedcc53c178e7604de90788 (clean) (release) (start)

CPU:
$ lscpu
Architecture: aarch64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
Socket(s): 1
Vendor ID: ARM
Model: 4
Model name: Cortex-A53
Stepping: r0p4
CPU max MHz: 1200.0000
CPU min MHz: 600.0000
BogoMIPS: 38.40
Vulnerability Itlb multihit: Not affected
Vulnerability L1tf: Not affected
Vulnerability Mds: Not affected
Vulnerability Meltdown: Not affected
Vulnerability Spec store bypass: Not affected
Vulnerability Spectre v1: Mitigation; __user pointer sanitization
Vulnerability Spectre v2: Not affected
Vulnerability Srbds: Not affected
Vulnerability Tsx async abort: Not affected
Flags: fp asimd evtstrm crc32 cpuid
$ cat /proc/cpuinfo
processor : 0
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 1
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 2
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

processor : 3
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4

Hardware : BCM2835
Revision : a02082
Serial : 00000000c79dc44c
Model : Raspberry Pi 3 Model B Rev 1.2

I can bring more details form the Raspberry 3B, too (e.g. in 32 Bit mode) but I assume that all versions of Raspberry 1 to at least 3B are affected. At least I observe this problems with 32 Bit and 64 Bit kernels with all kernel versions from 5.10 to the latest version 5.10.63
I already opened an issue on https://forums.raspberrypi.com/viewtopic.php?p=1902788#p1902788

It would be great if you can help and fix this problem.
Kind regards,
Roland