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2025-11-30 - 02:16
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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 50 highest latencies:
System rackbslot1.osadl.org (updated Sat Nov 29, 2025 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25734612222181,32sleep20-21swapper/207:08:582
25735542216191,14sleep30-21swapper/307:09:593
25733112214190,14sleep10-21swapper/107:07:001
25734492209186,13sleep00-21swapper/007:08:470
2573786997962,14cyclictest2734727-21snmp_ryswitch.c09:45:031
2573786997662,2cyclictest2672717-21snmp_ryswitch2.08:45:021
2573786997023,45cyclictest2858233-26chrome11:45:021
2573781996648,15cyclictest2734740-21/usr/sbin/munin09:45:030
2573781996547,14cyclictest2672747-21chrome08:45:020
2573786996460,3cyclictest2826458-21kworker/u8:2+flush-179:011:30:141
2573786995955,3cyclictest2831567-21kworker/u8:1+events_unbound12:25:111
2573786995955,3cyclictest2584630-21kworker/u8:0+events_unbound07:44:591
2573781995954,4cyclictest2631208-21kworker/u8:3+flush-179:008:20:290
2573788995842,14cyclictest2734735-21snmp_wanswitch.09:45:032
2573786995849,6cyclictest2770319-21latency_hist10:20:011
257378699573,54cyclictest2498433-21kworker/u8:4+efi_rts_wq07:46:161
2573788995651,4cyclictest2803690-21kworker/u8:2+flush-179:010:55:002
257378899564,51cyclictest2498433-21kworker/u8:4+efi_rts_wq07:46:172
2573781995652,3cyclictest2612479-21apt-get07:45:140
2573792995550,3cyclictest2581229-21apt-get07:15:143
2573786995551,3cyclictest2667235-21kworker/u8:0+flush-179:009:00:341
2573792995450,3cyclictest2909189-21munin-update12:35:363
2573788995438,15cyclictest2780445-21kworker/u8:1+flush-179:011:01:422
2573786995450,3cyclictest2780445-21kworker/u8:1+events_unbound10:40:301
2573781995451,2cyclictest2542427-21kworker/u8:1+events_unbound07:20:010
2573788995337,12cyclictest2672723-21apache_processe08:45:022
2573786995349,3cyclictest2842092-21kworker/u8:0+flush-179:011:35:161
2573786995349,3cyclictest2723348-21kworker/u8:4+events_unbound09:35:371
2573786995337,15cyclictest247560-21ThreadPoolForeg09:05:081
2573781995348,3cyclictest2796231-21snmp_wlanswitch10:45:020
2573786995248,3cyclictest2498433-21kworker/u8:4+flush-179:007:25:261
257378199529,10cyclictest2858180-21apache_processe11:45:020
2573781995249,2cyclictest2795064-21kworker/u8:5+flush-179:011:10:370
2573792995143,6cyclictest3125688-21Chrome_ChildIOT08:25:103
2573788995145,4cyclictest2720132-21apt-get09:30:142
2573788995145,4cyclictest2720132-21apt-get09:30:142
2573786995148,2cyclictest2878121-21kworker/u8:2+flush-179:012:20:321
2573786995147,3cyclictest2744390-21kworker/u8:2+flush-179:009:55:321
2573786995147,3cyclictest2498433-21kworker/u8:4+events_unbound07:10:281
2573781995148,2cyclictest2800480-21kworker/u8:0+flush-179:011:15:100
2573781995147,3cyclictest2711982-21kworker/u8:3+events_unbound10:00:130
2573781995147,3cyclictest2711982-21kworker/u8:3+events_unbound10:00:130
2573781995146,4cyclictest247516-21Chrome_ChildIOT07:20:040
2573781995146,3cyclictest2667235-21kworker/u8:0+events_unbound09:00:360
2573788995047,2cyclictest2717017-21kworker/u8:2+flush-179:009:40:262
2573788995045,4cyclictest76405-21systemd-journal11:15:012
2573786995046,3cyclictest2852044-21kworker/u8:3+events_unbound11:50:191
2573786995045,3cyclictest2584630-21kworker/u8:0+flush-179:007:55:271
2573786995044,5cyclictest247468-13Chrome_IOThread11:15:241
2573786995044,4cyclictest2744390-21kworker/u8:2+events_unbound10:20:341
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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