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2026-07-23 - 01:01

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 Wed Jul 22, 2026 12:45:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1896719998985,2cyclictest0-21swapper/011:20:020
1896719998824,13cyclictest1927578-21ssh10:01:450
1896719998783,2cyclictest0-21swapper/009:15:030
1896719998617,63cyclictest16850irq/134-800000011:48:440
1896719998417,62cyclictest16850irq/134-800000011:27:260
1896719998328,14cyclictest1981118-21ssh11:54:200
1896719998317,61cyclictest16850irq/134-800000012:07:590
1896719998220,12cyclictest1915782-21ssh09:36:400
1896719998220,12cyclictest1915782-21ssh09:36:400
1896719998218,59cyclictest16850irq/134-800000012:01:190
1896719998218,59cyclictest16850irq/134-800000012:01:190
189671999811,40cyclictest1963863-21ssh11:18:120
1896719998113,6cyclictest16850irq/134-800000009:28:590
1896719998028,46cyclictest3467602-21systemd-journal08:15:000
1896719997921,15cyclictest1950281-21ssh10:49:450
1896719997919,12cyclictest1998353-21ssh12:30:510
1896719997919,12cyclictest1998353-21ssh12:30:500
1896719997826,16cyclictest1991172-21ssh12:15:460
1896719997813,60cyclictest16850irq/134-800000010:55:230
189671999781,27cyclictest0-21swapper/009:12:260
1896719997771,4cyclictest0-21swapper/009:25:020
1896719997712,6cyclictest16850irq/134-800000007:43:340
1896719997712,6cyclictest16850irq/134-800000007:43:340
1896719997625,46cyclictest1933704-21cron10:14:590
1896719997617,12cyclictest1951508-21ssh10:52:020
1896719997528,15cyclictest1918210-21ssh09:41:450
1896719997526,15cyclictest1957950-21ssh11:05:260
1896719997526,15cyclictest1957950-21ssh11:05:260
1896719997425,14cyclictest1938060-21ssh10:23:540
1896719997414,50cyclictest16850irq/134-800000011:10:090
1896719997319,50cyclictest16850irq/134-800000011:38:440
1896719997317,46cyclictest16850irq/134-800000010:40:320
1896719997314,13cyclictest1913974-21ssh09:32:560
1896719997223,12cyclictest1941359-21ssh10:30:360
1896719997222,12cyclictest1921550-21ssh09:49:260
189671999721,66cyclictest1945612-21cron10:40:000
1896731997125,11cyclictest1969449-21pluginstate11:30:022
1896719997127,16cyclictest1994568-21ssh12:23:040
189671999711,54cyclictest1971385-21ssh11:33:580
189671999703,7cyclictest1900287-21cron08:20:010
189671999701,26cyclictest0-21swapper/011:43:250
1896731996930,35cyclictest3467602-21systemd-journal07:29:252
1896731996925,5cyclictest1924771-21sh09:55:532
1896731996925,4cyclictest1902666-21latency_hist09:05:012
1896719996927,11cyclictest1934579-21ssh10:16:330
1896719996923,9cyclictest1956078-21ssh11:01:420
1896719996920,12cyclictest1930025-21ssh10:07:000
1896719996920,12cyclictest1925757-21ssh09:58:050
1896719996919,13cyclictest2001539-21ssh12:37:460
1896719996916,48cyclictest16850irq/134-800000009:51:040
1896719996913,13cyclictest1996941-21ssh12:28:030
1896719996912,52cyclictest16850irq/134-800000010:29:220
1896724996811,42cyclictest1882931-21munin-node07:25:011
1896719996717,13cyclictest1988414-21ssh12:10:050
1896719996717,13cyclictest1988414-21ssh12:10:050
1896734996517,14cyclictest37-21ksoftirqd/311:10:013
1896734996517,14cyclictest37-21ksoftirqd/311:10:003
1896731996523,5cyclictest1931235-21sh10:09:462
1896719996521,9cyclictest1982513-21ssh11:57:030
1896734996425,11cyclictest37-21ksoftirqd/312:24:593
1896731996427,5cyclictest1975922-21sh11:43:272
1896731996424,6cyclictest1995445-21sh12:25:022
1896731996423,7cyclictest1917223-21modprobe09:40:012
1896731996423,7cyclictest1917223-21modprobe09:40:002
1896731996423,4cyclictest1910143-21latency_hist09:25:012
1896731996322,5cyclictest1961752-21sh11:13:522
1896731996220,9cyclictest1-21systemd10:15:002
189673199615,3cyclictest131rcu_preempt11:35:002
1896731996124,5cyclictest1923182-21sh09:52:442
1896731996025,7cyclictest1902355-21cron09:00:002
1896731996025,4cyclictest1950409-21latency_hist10:50:022
189671999605,21cyclictest1899248-21modprobe08:00:000
1896719996024,8cyclictest12-21ksoftirqd/008:32:400
1896719996023,5cyclictest1898235-21sendmail07:40:010
1896731995925,5cyclictest1902046-21latency_hist08:50:032
1896731995923,4cyclictest1944521-21sh10:37:212
1896731995921,8cyclictest30-21ksoftirqd/211:21:402
1896731995822,5cyclictest1902112-21latency_hist08:55:012
1896731995818,10cyclictest1983610-1kworker/u9:112:07:022
1896731995818,10cyclictest1-21systemd11:55:012
189671999583,21cyclictest1897179-21modprobe07:20:000
189671999583,21cyclictest1897179-21modprobe07:20:000
189673499574,9cyclictest37-21ksoftirqd/309:20:023
189673199574,3cyclictest131rcu_preempt10:42:332
1896731995725,5cyclictest1904605-21sh09:13:272
1896731995721,8cyclictest30-21ksoftirqd/212:39:592
1896731995721,7cyclictest30-21ksoftirqd/210:50:442
189673499562,12cyclictest37-21ksoftirqd/309:53:253
189673499561,9cyclictest1905351-21latency_hist09:15:023
189673499561,10cyclictest37-21ksoftirqd/310:25:013
1896731995623,4cyclictest1974304-21latency_hist11:40:012
1896731995622,7cyclictest30-21ksoftirqd/211:59:082
189671999561,28cyclictest0-21swapper/008:30:020
189671999561,28cyclictest0-21swapper/008:30:010
189671999561,12cyclictest1902450-21latency_hist09:00:010
189673499557,10cyclictest37-21ksoftirqd/311:40:013
1896734995546,5cyclictest37-21ksoftirqd/310:30:023
1896731995523,6cyclictest1955126-21munin-plugin-st11:00:002
1896731995523,5cyclictest1899421-21latency_hist08:00:022
1896731995520,10cyclictest30-21ksoftirqd/210:33:182
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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