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2026-07-16 - 11:49

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 16, 2026 00:45:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
39559029910657,35cyclictest0-21swapper/123:10:021
395590299985,60cyclictest4043259-21sh00:00:031
395590299854,57cyclictest4040752-21sh23:55:021
395590299767,24cyclictest4056828-21ssh00:28:471
3955902996625,10cyclictest3467602-21systemd-journal22:29:011
3955902996625,10cyclictest3467602-21systemd-journal22:29:011
3955907996540,18cyclictest1-21systemd23:59:592
395589899658,5cyclictest131rcu_preempt00:00:400
3955898996554,6cyclictest16950irq/224-800000020:20:000
3955909996417,9cyclictest37-21ksoftirqd/300:23:323
3955902996428,4cyclictest3990769-21latency_hist22:10:021
3955902996425,10cyclictest23-21ksoftirqd/121:40:001
3955902996324,7cyclictest3956309-21sshd19:15:441
395589899631,46cyclictest3994307-21kworker/u8:122:50:020
395589899631,46cyclictest3994307-21kworker/u8:122:50:020
3955909996213,8cyclictest37-21ksoftirqd/300:10:013
3955898996216,40cyclictest131rcu_preempt23:59:510
395590999618,15cyclictest4002748-21sed22:35:013
3955902996126,11cyclictest23-21ksoftirqd/123:25:051
3955898996123,22cyclictest0-21swapper/019:10:010
3955898996119,36cyclictest16850irq/134-800000023:30:230
395589899611,4cyclictest131rcu_preempt21:59:360
3955902996024,10cyclictest23-21ksoftirqd/121:40:251
3955902996024,10cyclictest23-21ksoftirqd/121:40:241
3955898996038,17cyclictest131rcu_preempt00:09:460
3955898996028,4cyclictest39754421ssh21:37:440
3955909995917,9cyclictest37-21ksoftirqd/300:30:013
3955909995917,11cyclictest37-21ksoftirqd/323:17:413
3955909995912,9cyclictest37-21ksoftirqd/322:55:003
3955902995925,12cyclictest4003088-21ssh22:35:261
3955902995925,12cyclictest4003088-21ssh22:35:261
3955898995929,15cyclictest3992174-21ssh22:12:410
3955898995919,35cyclictest16850irq/134-800000022:53:410
3955909995815,9cyclictest37-21ksoftirqd/319:40:003
3955909995815,9cyclictest37-21ksoftirqd/319:40:003
3955909995812,8cyclictest37-21ksoftirqd/321:36:143
3955898995819,34cyclictest12-21ksoftirqd/022:05:200
3955909995712,11cyclictest37-21ksoftirqd/323:50:093
3955909995710,9cyclictest37-21ksoftirqd/323:00:003
3955909995710,9cyclictest37-21ksoftirqd/323:00:003
3955909995710,12cyclictest37-21ksoftirqd/323:34:443
3955902995727,4cyclictest4000874-21sh22:30:501
3955898995734,4cyclictest12-21ksoftirqd/022:35:160
3955898995734,4cyclictest12-21ksoftirqd/022:35:160
3955898995728,13cyclictest4040097-21ssh23:53:550
395589899572,39cyclictest4018109-21ssh23:07:120
3955898995723,30cyclictest12-21ksoftirqd/023:01:280
3955909995615,8cyclictest37-21ksoftirqd/321:05:003
3955909995615,10cyclictest37-21ksoftirqd/323:25:153
3955907995647,6cyclictest3962112-21kworker/2:321:41:332
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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