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2026-04-17 - 02:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot5s.osadl.org (updated Thu Apr 16, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2289992826,1cyclictest28-21ksoftirqd/210:35:002
2289992626,0cyclictest0-21swapper/210:46:582
2289992625,1cyclictest28-21ksoftirqd/209:27:072
228999261,24cyclictest151rcu_preempt09:49:562
2288992624,1cyclictest12481-21dump-pmu-power11:35:001
228799263,22cyclictest62550irq/127-eno112:29:590
229199250,2cyclictest32471-21sh12:27:533
2289992522,0cyclictest0-21swapper/212:30:212
228999250,2cyclictest281ksoftirqd/210:51:362
228999250,24cyclictest28825-21diskmemload11:34:192
228999250,24cyclictest0-21swapper/209:34:512
228899250,24cyclictest28825-21diskmemload11:38:201
228799250,24cyclictest28825-21diskmemload10:10:530
228799250,24cyclictest12478-21awk11:35:000
228799250,24cyclictest0-21swapper/011:40:450
228799250,23cyclictest313-21systemd-journal08:35:010
2291992422,1cyclictest0-21swapper/311:59:493
2291992421,2cyclictest10362-21sh11:00:203
229199240,23cyclictest7387-21sleep10:25:013
229199240,23cyclictest28825-21diskmemload12:10:073
229199240,23cyclictest11180-21dump-pmu-power08:35:013
229199240,23cyclictest0-21swapper/309:35:533
229199240,1cyclictest9708-21sh11:33:213
229199240,1cyclictest28825-21diskmemload10:56:133
228999240,23cyclictest28825-21diskmemload11:23:542
228999240,23cyclictest28825-21diskmemload09:50:292
228999240,23cyclictest1908-21ssh12:29:502
228999240,1cyclictest0-21swapper/211:53:132
228899240,23cyclictest17865-21taskset10:35:351
228899240,23cyclictest15714-21ssh12:10:381
228899240,23cyclictest14450-21apt-get09:29:461
228899240,1cyclictest0-21swapper/112:20:391
228899240,0cyclictest0-21swapper/109:11:371
2287992423,1cyclictest62550irq/127-eno111:39:070
228799240,24cyclictest0-21swapper/010:02:310
228799240,23cyclictest28825-21diskmemload11:00:570
228799240,23cyclictest0-21swapper/012:32:480
228799240,23cyclictest0-21swapper/012:20:490
228799240,0cyclictest0-21swapper/010:06:140
228799240,0cyclictest0-21swapper/009:34:080
2291992323,0cyclictest0-21swapper/311:22:003
2291992323,0cyclictest0-21swapper/310:12:163
2291992320,2cyclictest28965-21sshd09:43:583
229199230,2cyclictest31545-21ssh10:18:183
229199230,23cyclictest28825-21diskmemload11:27:193
229199230,23cyclictest28825-21diskmemload10:07:153
229199230,23cyclictest0-21swapper/312:04:213
229199230,22cyclictest25547-21ssh11:15:453
229199230,22cyclictest19907-21ssh10:38:563
229199230,22cyclictest19873-21df09:34:473
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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