periodic High Mysql usage after 11.5.30 upgrade #2

[ZopfWare]

top - 05:05:13 up 1 day, 5:48, 0 users, load average: 0.10, 0.78, 0.69
Tasks: 203 total, 1 running, 202 sleeping, 0 stopped, 0 zombie
Cpu(s): 4.3%us, 2.0%sy, 0.1%ni, 92.8%id, 0.8%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 12308584k total, 7289756k used, 5018828k free, 457576k buffers
Swap: 4194288k total, 0k used, 4194288k free, 4038060k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1 root 20 0 19364 1580 1268 S 0.0 0.0 0:03.01 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root RT 0 0 0 0 S 0.0 0.0 0:00.15 migration/0
4 root 20 0 0 0 0 S 0.0 0.0 0:01.94 ksoftirqd/0
5 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
6 root RT 0 0 0 0 S 0.0 0.0 0:00.08 watchdog/0
7 root RT 0 0 0 0 S 0.0 0.0 0:00.50 migration/1
8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1
9 root 20 0 0 0 0 S 0.0 0.0 0:01.14 ksoftirqd/1
10 root RT 0 0 0 0 S 0.0 0.0 0:00.06 watchdog/1
11 root RT 0 0 0 0 S 0.0 0.0 0:00.24 migration/2
12 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/2
13 root 20 0 0 0 0 S 0.0 0.0 0:02.39 ksoftirqd/2
14 root RT 0 0 0 0 S 0.0 0.0 0:00.06 watchdog/2
15 root RT 0 0 0 0 S 0.0 0.0 0:00.17 migration/3
16 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/3
17 root 20 0 0 0 0 S 0.0 0.0 0:05.55 ksoftirqd/3
18 root RT 0 0 0 0 S 0.0 0.0 0:00.06 watchdog/3
19 root 20 0 0 0 0 S 0.0 0.0 0:17.25 events/0