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2026-05-15 - 19:04

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 Fri May 15, 2026 12:45:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
880927999614,37cyclictest0-21swapper/012:25:020
880927998625,15cyclictest882033-21cat07:30:020
880927998325,32cyclictest150-21pr/ttyS209:24:300
880927998325,31cyclictest150-21pr/ttyS210:22:380
88092799819,36cyclictest0-21swapper/010:20:010
880927998073,3cyclictest131rcu_preempt10:40:030
880927998015,34cyclictest0-21swapper/011:51:430
880927997922,17cyclictest984156-21ssh12:30:510
880927997812,33cyclictest0-21swapper/011:20:180
880927997727,16cyclictest883197-21latency_hist07:55:050
880927997723,16cyclictest967846-21ssh11:57:000
880927997715,26cyclictest882743-21latency_hist07:45:010
880927997537,4cyclictest935485-21munin-run10:50:010
880927997537,4cyclictest935485-21munin-run10:50:010
880927997432,11cyclictest945684-21ssh11:10:560
880927997430,12cyclictest958444-21ssh11:37:400
880927997324,44cyclictest926850-21ssh10:32:040
880927997224,14cyclictest976354-21munin-run12:15:010
880927997211,35cyclictest0-21swapper/011:26:440
880927997211,35cyclictest0-21swapper/011:26:440
880927997123,24cyclictest150-21pr/ttyS210:13:330
880927997116,24cyclictest885951-21latency_hist08:45:020
880927997024,15cyclictest931433-21ssh10:41:200
880927997022,15cyclictest986887-21ssh12:36:360
880927996929,35cyclictest48-21kcompactd011:05:170
880927996929,35cyclictest48-21kcompactd011:05:170
880927996929,10cyclictest977134-21sh12:16:230
880927996926,13cyclictest0-21swapper/009:26:080
880927996923,14cyclictest901323-21ssh09:39:380
880927996922,15cyclictest881391-21/usr/sbin/munin07:20:000
880927996824,22cyclictest0-21swapper/011:43:010
880927996823,15cyclictest942653-21munin-run11:05:000
880927996815,22cyclictest911168-21ssh09:59:530
880927996656,5cyclictest880930-21latency_hist07:10:020
880927996526,35cyclictest0-21swapper/010:07:310
880927996526,35cyclictest0-21swapper/010:07:310
880927996524,12cyclictest981935-21ssh12:26:150
880927996522,39cyclictest889652-21latency_hist09:15:020
880927996522,11cyclictest949876-21munin-run11:20:010
880927996427,4cyclictest971806-21ssh12:05:060
880927996427,4cyclictest971806-21ssh12:05:060
880927996416,16cyclictest904038-21latency_hist09:45:010
880927996342,17cyclictest884807-21sshd08:24:430
880927996320,38cyclictest0-21swapper/008:19:210
880927996317,13cyclictest940384-21cut11:00:020
880927996229,17cyclictest898298-21ssh09:33:000
880927996221,36cyclictest150-21pr/ttyS212:00:280
880927996142,16cyclictest883326-21cat07:55:020
880927996132,4cyclictest364-21snmpd08:06:380
880927996127,29cyclictest0-21swapper/011:45:180
880927996120,12cyclictest12-21ksoftirqd/008:05:000
880927996119,38cyclictest0-21swapper/010:55:020
880927996112,22cyclictest0-21swapper/010:29:370
880927996033,22cyclictest886603-21cron09:00:000
880927996028,16cyclictest906892-21ssh09:50:380
880927996013,14cyclictest886363-21/usr/sbin/munin08:55:010
880927996010,15cyclictest905753-21ssh09:48:350
880936995910,18cyclictest966932-21ssh11:55:022
880927995918,4cyclictest1-21systemd10:05:000
880927995743,11cyclictest882380-21sshd07:35:430
880927995743,10cyclictest882132-21sshd07:31:440
880927995742,12cyclictest886874-21sshd09:04:180
880927995715,12cyclictest887151-21diskmemload09:19:560
880936995648,5cyclictest874333-21kworker/2:109:13:242
880936995646,6cyclictest959557-21kworker/2:012:40:002
880936995545,6cyclictest906478-21kworker/2:211:00:022
880936995545,6cyclictest874333-21kworker/2:107:20:022
880927995540,12cyclictest885292-21sshd08:30:440
880927995519,11cyclictest0-21swapper/011:32:130
880936995446,5cyclictest906478-21kworker/2:212:03:032
880936995446,5cyclictest906478-21kworker/2:211:49:202
880936995445,6cyclictest874333-21kworker/2:110:54:082
880936995445,5cyclictest959557-21kworker/2:012:20:262
880936995443,6cyclictest906478-21kworker/2:211:20:282
880927995439,11cyclictest881675-21munin-run07:25:010
880927995439,11cyclictest881675-21munin-run07:25:010
880927995420,30cyclictest0-21swapper/007:47:180
880941995319,7cyclictest131rcu_preempt10:35:023
880936995345,5cyclictest906478-21kworker/2:211:14:202
880936995337,11cyclictest1-21systemd10:40:012
880936995335,13cyclictest275-21dbus-daemon12:35:022
880927995346,5cyclictest19350irq/34-mmc109:05:020
880927995340,10cyclictest886087-21sshd08:48:430
880936995244,5cyclictest906478-21kworker/2:211:30:182
880936995244,5cyclictest874333-21kworker/2:110:33:592
880936995244,5cyclictest874333-21kworker/2:109:15:102
880936995243,6cyclictest906478-21kworker/2:211:59:382
880936995243,6cyclictest874333-21kworker/2:109:31:592
880936995243,5cyclictest874333-21kworker/2:109:05:022
88093699521,16cyclictest887151-21diskmemload10:21:362
880932995238,8cyclictest23-21ksoftirqd/111:20:021
880927995241,7cyclictest881095-21sshd07:12:430
880941995132,15cyclictest275-21dbus-daemon11:55:003
880936995143,5cyclictest906478-21kworker/2:211:18:212
880936995143,5cyclictest906478-21kworker/2:211:10:022
880936995143,5cyclictest906478-21kworker/2:211:10:022
880936995142,6cyclictest959557-21kworker/2:012:27:462
880936995142,6cyclictest874333-21kworker/2:109:56:472
880927995140,9cyclictest885553-21sshd08:37:430
880927995135,11cyclictest364-21snmpd07:55:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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