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2025-11-15 - 22:49
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot6.osadl.org (updated Sat Nov 15, 2025 12:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29524759910580,14cyclictest2960574-21latency_hist07:35:001
29524759910089,8cyclictest2970162-21latency_hist08:05:011
2952474998882,5cyclictest3051142-21kworker/u8:1+events_unbound12:20:250
2952474998783,3cyclictest2963785-21kworker/u8:0+flush-179:008:00:230
2952474998176,4cyclictest3022126-21kworker/u8:2+flush-179:011:00:250
2952474998075,4cyclictest3026627-21kworker/u8:0+events_unbound11:05:250
2952475997972,5cyclictest3026627-21kworker/u8:0+flush-179:011:00:011
2952475997972,5cyclictest3026627-21kworker/u8:0+flush-179:011:00:001
2952474997870,6cyclictest2957383-21kworker/u8:1+flush-179:007:30:180
2952475997766,8cyclictest2953944-21latency_hist07:15:011
2952474997768,7cyclictest3036455-21/usr/sbin/munin11:30:290
2952474997469,4cyclictest2979697-21kworker/u8:0+flush-179:009:15:470
2952475997353,17cyclictest3025063-21latency_hist10:55:011
2952474997369,3cyclictest2990883-21kworker/u8:2+events_unbound09:30:210
2952474997268,4cyclictest3039448-21kworker/u8:3+events_unbound11:55:320
2952474997267,4cyclictest3032842-21kworker/u8:0+events_unbound11:20:250
2952474997262,7cyclictest2987666-21latency_hist09:00:000
2952475997165,4cyclictest3022126-21kworker/u8:2+flush-179:011:40:251
2952475997163,5cyclictest3039448-21kworker/u8:3+flush-179:012:15:261
2952475997060,8cyclictest3054253-21apt-get12:25:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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