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2026-09-11 - 09:58

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 here to display the system's profile data or here to proceed to next system.
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 rack0slot3s.osadl.org (updated Fri Sep 11, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
41593192266216,17sleep30-21swapper/318:57:373
41594012263216,16sleep60-21swapper/618:58:486
41593352260215,36sleep10-21swapper/118:57:521
41593322259217,33sleep70-21swapper/718:57:507
41591992259219,17sleep40-21swapper/418:55:584
41592042258218,31sleep00-21swapper/018:56:020
41591442251223,18sleep20-21swapper/218:55:152
41579332247221,17sleep50-21swapper/518:54:115
4159729993415,3cyclictest0-21swapper/520:42:335
4159734993332,1cyclictest0-21swapper/600:10:366
4159738993225,5cyclictest39568-21iostat21:13:337
4159716993129,1cyclictest0-21swapper/200:24:372
4159707993129,1cyclictest117869-21kworker/0:1+events00:03:040
4159738993029,1cyclictest0-21swapper/723:17:287
415973899290,25cyclictest0-21swapper/723:25:557
415971199290,25cyclictest0-21swapper/119:47:361
415971199290,25cyclictest0-21swapper/119:47:361
4159725992826,1cyclictest0-21swapper/419:04:224
415972599282,5cyclictest528-21systemd-journal20:37:224
4159738992718,3cyclictest0-21swapper/719:10:057
415972599273,23cyclictest528-21systemd-journal00:02:184
415972599271,4cyclictest528-21systemd-journal22:41:314
4159711992723,3cyclictest58834-21cat21:49:391
415970799270,1cyclictest0-21swapper/023:44:450
415970799270,1cyclictest0-21swapper/020:54:100
415973899260,24cyclictest0-21swapper/721:50:247
415973499260,24cyclictest0-21swapper/619:34:046
415972999260,24cyclictest0-21swapper/521:31:145
415972599261,23cyclictest59-21ksoftirqd/422:02:164
415972099260,22cyclictest0-21swapper/319:18:583
415970799260,22cyclictest0-21swapper/000:35:030
4159738992521,3cyclictest1390-21snmpd22:55:047
4159738992518,3cyclictest0-21swapper/719:58:317
415973899250,23cyclictest0-21swapper/719:40:477
415973899250,23cyclictest0-21swapper/719:40:477
415973899250,23cyclictest0-21swapper/700:11:357
4159734992522,3cyclictest1390-21snmpd22:25:586
4159734992521,3cyclictest1390-21snmpd20:20:046
4159729992524,1cyclictest0-21swapper/520:05:025
4159729992522,2cyclictest1390-21snmpd20:27:275
4159729992521,3cyclictest1390-21snmpd22:51:515
4159729992521,3cyclictest1390-21snmpd00:31:175
4159729992518,5cyclictest0-21swapper/520:07:305
4159725992523,1cyclictest0-21swapper/423:02:114
415972599252,22cyclictest528-21systemd-journal21:37:374
415972599252,22cyclictest528-21systemd-journal00:23:374
4159725992521,3cyclictest1390-21snmpd23:11:044
415972599251,3cyclictest888-21in:imjournal00:16:154
4159720992521,3cyclictest6544-21cat20:11:313
4159720992521,3cyclictest1390-21snmpd23:18:433
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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