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2026-07-02 - 11:54

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #3

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot3s.osadl.org (updated Thu Jul 02, 2026 00:45:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
355878899119115,2cyclictest0-21swapper/019:15:020
3558793998623,19cyclictest275-21dbus-daemon00:25:011
3558793998623,19cyclictest275-21dbus-daemon00:25:001
3558788998270,3cyclictest0-21swapper/020:00:010
3558802998171,7cyclictest37-21ksoftirqd/321:20:023
3558797997742,6cyclictest3549852-21kworker/2:122:22:512
3558793997020,19cyclictest3646220-40mandb00:00:031
3558793997011,18cyclictest3644306-21ssh23:55:311
355878899704,31cyclictest131rcu_preempt00:15:260
355878899704,31cyclictest131rcu_preempt00:15:250
3558793996916,20cyclictest3640851-21ssh23:48:351
355880299671,49cyclictest3467602-21systemd-journal21:50:023
355879799665,55cyclictest3563214-21wc20:35:022
3558797996625,37cyclictest3562807-21sed20:25:022
3558793996610,20cyclictest3655321-21ssh00:18:551
3558793996610,20cyclictest3655321-21ssh00:18:551
355878899667,32cyclictest364-21snmpd00:05:020
355878899663,9cyclictest121ksoftirqd/022:19:570
355880299659,13cyclictest131rcu_preempt23:13:473
355880299659,13cyclictest131rcu_preempt23:13:473
3558797996520,11cyclictest30-21ksoftirqd/221:25:002
355878899658,29cyclictest131rcu_preempt23:53:370
355878899656,6cyclictest131rcu_preempt23:20:000
3558802996455,6cyclictest37-21ksoftirqd/323:52:473
3558797996426,33cyclictest3654049-21sh00:16:082
3558797996426,33cyclictest3654049-21sh00:16:072
3558797996423,13cyclictest30-21ksoftirqd/222:16:452
3558797996420,5cyclictest3627455-21sh23:20:042
3558797996420,5cyclictest3627455-21sh23:20:032
355879399647,21cyclictest3615868-21rm22:55:541
3558793996410,17cyclictest3622853-21ssh23:10:221
3558793996410,17cyclictest3622853-21ssh23:10:221
3558793996317,9cyclictest23-21ksoftirqd/123:33:201
3558793996310,13cyclictest3577503-21ssh21:35:541
3558788996331,9cyclictest12-21ksoftirqd/023:03:540
3558788996330,30cyclictest12-21ksoftirqd/020:40:010
3558797996227,31cyclictest30-21ksoftirqd/220:59:032
3558797996226,31cyclictest3632507-21sh23:30:412
3558797996225,33cyclictest3596362-21latency_hist22:15:022
3558797996222,11cyclictest30-21ksoftirqd/222:34:512
3558797996219,7cyclictest3632834-1kworker/u9:123:36:312
3558797996219,11cyclictest30-21ksoftirqd/221:25:532
355879399626,17cyclictest1-21systemd22:20:011
355878899623,54cyclictest3609932-21ssh22:43:450
3558797996152,6cyclictest3633360-21kworker/2:223:45:022
3558797996125,12cyclictest275-21dbus-daemon20:15:012
3558797996120,11cyclictest30-21ksoftirqd/221:50:302
355879399619,16cyclictest3631126-21ssh23:28:051
3558793996116,7cyclictest23-21ksoftirqd/121:41:311
3558793996114,15cyclictest3565406-21ssh21:10:351
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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