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2026-03-28 - 20:34

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 100 highest latencies:
System rackeslot3s.osadl.org (updated Sat Mar 28, 2026 12:45:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26815359910397,4cyclictest2694375-21ssh09:25:020
268153599877,45cyclictest12-21ksoftirqd/012:10:010
2681540998624,33cyclictest2742776-21sh11:17:501
2681540997334,15cyclictest131rcu_preempt12:15:021
2681546997163,6cyclictest2687858-21ssh09:10:033
268154099712,12cyclictest48-21kcompactd011:05:031
2681545996941,19cyclictest3467602-21systemd-journal10:00:002
2681540996930,36cyclictest2730378-21sh10:49:111
2681540996929,36cyclictest2753189-21sh11:41:551
268154099691,55cyclictest0-21swapper/112:30:031
268154099691,55cyclictest0-21swapper/112:30:021
2681540996826,39cyclictest23-21ksoftirqd/110:40:331
2681540996826,39cyclictest23-21ksoftirqd/110:40:331
2681540996821,42cyclictest2758421-21sh11:54:311
268153599686,37cyclictest131rcu_preempt12:05:010
2681540996622,40cyclictest23-21ksoftirqd/109:13:491
268154099662,18cyclictest2768945-21ssh12:18:541
268154099662,18cyclictest2768945-21ssh12:18:541
268154099662,18cyclictest2731166-21sh10:50:311
268154099662,18cyclictest2731166-21sh10:50:311
268154099662,18cyclictest2722916-21ssh10:31:281
268154099662,18cyclictest2722916-21ssh10:31:281
268154099661,18cyclictest2746946-21sh11:27:271
268153599666,9cyclictest121ksoftirqd/010:37:330
268153599661,5cyclictest0-21swapper/010:01:490
2681540996528,33cyclictest2754679-21sh11:45:181
2681540996528,33cyclictest2754679-21sh11:45:171
268154099652,21cyclictest2718720-21rm10:21:481
2681540996428,32cyclictest2740212-21sh11:11:501
2681540996425,35cyclictest2699490-21sh09:37:111
2681540996425,35cyclictest2699490-21sh09:37:111
268154099642,12cyclictest2715365-21ssh10:14:231
268154099642,12cyclictest2715365-21ssh10:14:231
268154099641,17cyclictest2705444-21ssh09:50:481
268153599647,7cyclictest121ksoftirqd/011:08:590
268154099632,57cyclictest2763292-21ssh12:05:211
268154099632,20cyclictest2717567-21ssh10:19:221
268154099632,13cyclictest2704816-21ssh09:49:501
268154099631,9cyclictest2774219-21ssh12:30:451
268154099631,9cyclictest2760260-21ssh11:58:431
268154099631,9cyclictest2760260-21ssh11:58:431
268154099631,10cyclictest2744504-21ssh11:21:401
268154099631,10cyclictest2702247-21ssh09:43:371
268153599639,27cyclictest131rcu_preempt10:06:410
268153599638,24cyclictest12-21ksoftirqd/008:55:020
2681535996334,4cyclictest131rcu_preempt10:47:220
2681540996223,33cyclictest23-21ksoftirqd/110:03:141
268154099621,8cyclictest2748180-21ssh11:30:091
268154099621,7cyclictest2770147-21ssh12:21:191
268154099621,57cyclictest2707416-21ssh09:55:261
2681535996231,15cyclictest2768386-21ssh12:17:240
2681535996231,15cyclictest2768386-21ssh12:17:240
2681535996210,5cyclictest131rcu_preempt12:21:560
268154599611,40cyclictest2730836-21ssh10:50:012
268154099613,12cyclictest2684598-21munin-run08:10:001
268154099612,6cyclictest2685659-21munin-run08:30:011
268154099611,8cyclictest2776274-21ssh12:35:341
268154099611,8cyclictest2762343-21ssh12:03:281
268154099611,8cyclictest2750948-21ssh11:36:431
268154099611,8cyclictest2693822-21ssh09:24:141
268154099611,7cyclictest2720395-21ssh10:25:351
268154099611,7cyclictest2711948-21ssh10:05:551
268154099611,7cyclictest2694507-21ssh09:25:191
268154099611,7cyclictest2691345-21ssh09:18:301
268154099611,6cyclictest2735587-21ssh11:00:551
268153599617,8cyclictest12-21ksoftirqd/011:01:150
2681545996039,16cyclictest3467602-21systemd-journal08:15:002
2681540996028,27cyclictest2682275-21munin-run07:25:001
268154099602,54cyclictest2687481-21munin-run09:05:001
268154099602,13cyclictest2733202-21ssh10:55:211
268154099601,7cyclictest2724978-21ssh10:36:181
268154099601,15cyclictest2696889-21sh09:30:581
268153599607,9cyclictest121ksoftirqd/009:31:130
268153599606,33cyclictest0-21swapper/009:51:160
268153599605,13cyclictest12-21ksoftirqd/009:21:150
268153599601,9cyclictest12-21ksoftirqd/010:16:450
268154099592,5cyclictest2681735-21munin-run07:14:591
268154099591,8cyclictest1-21systemd07:30:011
2681535995950,6cyclictest151rcuc/011:10:040
268153599594,28cyclictest12-21ksoftirqd/010:14:010
268153599594,28cyclictest12-21ksoftirqd/010:14:010
2681535995918,36cyclictest16850irq/134-800000011:31:530
2681535995915,4cyclictest2727572-21ssh10:42:230
2681535995915,4cyclictest2727572-21ssh10:42:220
268154099583,49cyclictest2683801-21cron07:55:001
268154099582,5cyclictest2687199-21munin-run09:00:011
268154099581,6cyclictest2685084-21sshd08:17:161
268154099581,13cyclictest364-21snmpd08:21:561
2681535995822,31cyclictest2700626-21latency_hist09:40:020
2681535995822,31cyclictest2700626-21latency_hist09:40:020
2681535995817,12cyclictest12-21ksoftirqd/009:11:110
2681546995715,13cyclictest37-21ksoftirqd/311:10:013
2681545995748,6cyclictest2687495-21kworker/2:309:50:022
2681545995746,7cyclictest2674628-21kworker/2:212:30:022
2681545995746,7cyclictest2674628-21kworker/2:212:30:022
2681545995746,6cyclictest2674628-21kworker/2:211:54:412
2681545995744,9cyclictest2674628-21kworker/2:208:50:012
268154099572,5cyclictest2686935-21munin-run08:55:011
268154099571,12cyclictest2681969-21sshd07:17:161
2681535995730,23cyclictest16850irq/134-800000011:51:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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