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2026-05-05 - 09:49

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 Tue May 05, 2026 00:45:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1604800998819,35cyclictest1607640-21latency_hist20:05:022
1604787998520,55cyclictest16850irq/134-800000021:28:180
1604787997619,52cyclictest1655380-21ssh22:42:070
160478799751,68cyclictest1688152-21latency_hist23:50:030
1604787997332,24cyclictest1648022-21ssh22:26:470
1604787997320,44cyclictest16850irq/134-800000022:14:520
160478799731,37cyclictest1639766-21modprobe22:09:590
1604787997226,29cyclictest1645046-21ssh22:20:200
1604787997221,17cyclictest16850irq/134-800000023:40:390
1604787997218,44cyclictest16850irq/134-800000021:38:400
160480399713,15cyclictest1693210-21ssh00:00:233
1604787997134,33cyclictest1675768-21ssh23:24:430
1604787997121,15cyclictest16850irq/134-800000023:32:430
1604787997117,40cyclictest16850irq/134-800000023:02:450
1604787997116,46cyclictest16850irq/134-800000023:13:090
1604787997031,35cyclictest1700715-21ssh00:16:040
1604787997020,41cyclictest16850irq/134-800000021:23:190
1604787997017,44cyclictest16850irq/134-800000021:52:400
160480099692,60cyclictest275-21dbus-daemon20:45:012
1604787996934,30cyclictest1612900-21sh21:13:530
1604787996928,25cyclictest1695004-21ssh00:04:370
1604787996915,45cyclictest16850irq/134-800000021:49:110
1604787996915,45cyclictest16850irq/134-800000021:49:110
1604803996827,35cyclictest1-21systemd23:25:003
1604800996829,35cyclictest1697270-21sh00:09:122
160478799683,32cyclictest1696615-21ssh00:07:440
160478799682,58cyclictest1610217-21modprobe20:55:010
1604787996819,37cyclictest16850irq/134-800000000:26:530
160478799681,35cyclictest1678305-21systemd-run23:30:000
160478799672,29cyclictest1653027-21ssh22:37:140
1604787996717,44cyclictest16850irq/134-800000021:19:180
1604787996717,44cyclictest16850irq/134-800000021:19:180
160480099662,47cyclictest1611016-21diskmemload23:11:282
1604787996628,34cyclictest1635494-21ssh22:00:380
1604787996628,34cyclictest1635494-21ssh22:00:370
160478799661,61cyclictest0-21swapper/022:51:400
1604803996518,42cyclictest1671047-1kworker/u9:200:10:453
160480099652,58cyclictest1632106-21ssh21:53:522
160480099652,4cyclictest131rcu_preempt21:35:012
1604793996518,9cyclictest23-21ksoftirqd/121:55:011
160478799651,60cyclictest0-21swapper/022:00:020
1604803996424,36cyclictest1638083-21sh22:06:023
160480399642,18cyclictest1677559-21ssh23:28:233
1604800996425,34cyclictest1692933-21sh00:00:022
160480099641,20cyclictest1650317-21ssh22:31:322
1604787996421,26cyclictest1621386-21ssh21:31:180
160480399632,17cyclictest1627451-21ssh21:44:103
160480399631,20cyclictest1640337-21ssh22:10:433
1604800996324,36cyclictest1628101-21sh21:45:062
1604800996324,36cyclictest1628101-21sh21:45:052
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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