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2026-08-04 - 05:16

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 Tue Aug 04, 2026 00:45:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
178466999999,4cyclictest131rcu_preempt20:40:023
178466099875,71cyclictest1872334-21rm00:00:031
178466099875,71cyclictest1872334-21rm00:00:031
1784655998529,22cyclictest1828684-21ssh22:29:150
1784655998034,23cyclictest1805830-21ssh21:41:070
1784669997821,18cyclictest1863027-21ssh23:40:303
1784669997818,25cyclictest1890359-21ssh00:38:023
1784655997834,24cyclictest1790881-21diskmemload22:50:030
1784669997622,21cyclictest1785899-21modprobe19:35:003
1784669997622,16cyclictest1834739-21ssh22:41:383
1784660997626,42cyclictest0-21swapper/123:35:021
178466099761,71cyclictest1784662-21latency_hist19:10:021
1784669997425,13cyclictest1849735-21ssh23:13:073
1784669997314,23cyclictest1840800-21ssh22:54:343
1784655997330,21cyclictest1826536-21ssh22:24:470
1784669997237,31cyclictest1884075-21cron00:25:003
1784669997221,16cyclictest1832461-21ssh22:36:563
1784669997219,16cyclictest1814636-21ssh21:59:573
1784669997114,18cyclictest1804493-21ssh21:38:333
1784655997131,32cyclictest12-21ksoftirqd/023:55:020
178466999693,4cyclictest131rcu_preempt23:40:013
1784669996919,17cyclictest1787188-21munin-run20:00:013
1784669996915,15cyclictest1858555-21ssh23:31:173
1784669996839,24cyclictest150-21pr/ttyS223:27:033
1784669996817,18cyclictest1877042-21cat00:10:023
1784669996617,18cyclictest1806750-21ssh21:43:153
1784669996615,15cyclictest1797153-21ssh21:23:063
1784660996627,4cyclictest1885121-21sh00:26:591
1784669996513,14cyclictest1866809-21ssh23:48:513
1784660996529,11cyclictest1-21systemd00:40:011
1784655996538,19cyclictest0-21swapper/022:41:500
1784669996417,14cyclictest1792248-21ssh21:12:503
1784660996422,8cyclictest1785960-21grep19:35:021
178465599641,3cyclictest131rcu_preempt21:10:020
1784669996316,16cyclictest1788952-21sed20:30:033
1784669996315,14cyclictest1844885-21ssh23:02:573
1784660996328,8cyclictest23-21ksoftirqd/121:35:011
1784660996325,9cyclictest23-21ksoftirqd/122:55:051
1784660996324,5cyclictest309-21in:imuxsock21:40:011
1784660996323,11cyclictest23-21ksoftirqd/122:50:001
1784669996222,15cyclictest1827003-21ssh22:25:163
1784669996215,15cyclictest1824931-21ssh22:20:573
1784669996211,14cyclictest1801052-21ssh21:31:083
178465599621,3cyclictest131rcu_preempt00:15:370
178465599614,4cyclictest131rcu_preempt21:17:240
1784669996020,16cyclictest1790881-21diskmemload00:33:473
1784669996014,15cyclictest1816860-21ssh22:04:313
178465599607,42cyclictest19350irq/34-mmc123:30:020
1784655996021,34cyclictest16850irq/134-800000023:20:010
1784669995946,10cyclictest1794962-21ssh21:18:353
1784669995943,13cyclictest1822681-21ssh22:16:213
1784655995929,14cyclictest1876482-21ssh00:09:100
1784655995910,44cyclictest16850irq/134-800000023:35:540
1784669995845,10cyclictest1808348-21ssh21:46:233
1784669995814,16cyclictest1846498-21ssh23:06:073
1784664995849,6cyclictest1790611-21kworker/2:121:25:002
178466499583,3cyclictest131rcu_preempt22:20:022
1784660995825,9cyclictest23-21ksoftirqd/123:20:321
1784660995823,12cyclictest23-21ksoftirqd/122:10:371
178465599581,3cyclictest131rcu_preempt00:28:060
178466499574,3cyclictest131rcu_preempt21:10:012
1784660995724,11cyclictest23-21ksoftirqd/122:15:091
1784655995729,17cyclictest0-21swapper/021:53:240
1784655995728,13cyclictest1889529-21ssh00:36:020
1784655995728,13cyclictest1842775-21ssh22:58:440
1784655995726,14cyclictest1887562-21ssh00:32:080
178465599572,39cyclictest1799003-21ssh21:26:520
1784655995723,30cyclictest12-21ksoftirqd/023:55:070
1784655995719,34cyclictest16850irq/134-800000023:14:040
1784655995718,34cyclictest16850irq/134-800000022:30:120
1784655995716,36cyclictest16850irq/134-800000021:49:490
178465599571,36cyclictest131rcu_preempt23:04:190
1784669995640,12cyclictest1842619-21ssh22:58:133
1784669995639,13cyclictest1873547-21ssh00:02:523
1784669995639,13cyclictest1873547-21ssh00:02:523
1784669995618,8cyclictest0-21swapper/323:54:503
1784655995618,33cyclictest16850irq/134-800000023:20:340
1784655995618,33cyclictest16850irq/134-800000021:20:450
1784655995617,34cyclictest16850irq/134-800000021:38:160
1784655995615,37cyclictest16850irq/134-800000021:14:000
1784669995543,10cyclictest1837454-21ssh22:47:163
1784669995539,13cyclictest1820199-21ssh22:11:113
1784669995539,12cyclictest1884597-21ssh00:25:463
1784660995538,12cyclictest3467602-21systemd-journal21:25:001
1784660995524,10cyclictest23-21ksoftirqd/123:44:271
1784655995518,34cyclictest16850irq/134-800000022:51:400
1784655995518,33cyclictest16850irq/134-800000023:43:170
1784655995518,33cyclictest16850irq/134-800000022:02:310
1784655995518,19cyclictest16850irq/134-800000022:10:370
1784655995517,34cyclictest16850irq/134-800000023:26:570
1784655995517,34cyclictest16850irq/134-800000022:35:470
1784655995517,33cyclictest16850irq/134-800000021:34:530
1784655995516,19cyclictest16850irq/134-800000000:04:470
1784655995516,19cyclictest16850irq/134-800000000:04:470
1784655995515,35cyclictest16850irq/134-800000000:25:030
1784669995439,12cyclictest1880294-21ssh00:16:543
1784669995439,12cyclictest1869983-21ssh23:55:103
1784669995439,12cyclictest1853472-21ssh23:20:413
1784669995439,12cyclictest1810933-21ssh21:51:543
1784660995435,15cyclictest1-21systemd23:20:021
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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