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2026-05-03 - 20:39

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 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 Sun May 03, 2026 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
18163392262217,15sleep20-21swapper/219:06:002
18143072261214,17sleep10-21swapper/119:05:021
18166722258216,32sleep40-21swapper/419:09:484
18164602257214,33sleep60-21swapper/619:07:316
18163202255210,16sleep70-21swapper/719:05:487
18164682250208,18sleep30-21swapper/319:07:383
18166512243218,16sleep50-21swapper/519:09:325
18165642242202,17sleep00-21swapper/019:08:310
19026442410,2sleep568-21ksoftirqd/521:44:585
181699299350,1cyclictest0-21swapper/222:25:142
1817005993430,3cyclictest1934218-21cat22:40:145
1817005993430,3cyclictest1934218-21cat22:40:145
1817001993431,3cyclictest1391-21snmpd00:15:214
181699699319,1cyclictest0-21swapper/322:23:583
1816987992927,1cyclictest0-21swapper/119:25:151
1817010992825,3cyclictest1925988-21cat22:25:156
181699299285,22cyclictest0-21swapper/223:10:592
1817014992725,1cyclictest18393452sleep719:48:127
181700599270,22cyclictest0-21swapper/521:30:205
1816996992721,5cyclictest1391-21snmpd19:15:053
1817014992625,1cyclictest0-21swapper/700:30:587
1817005992625,1cyclictest0-21swapper/522:55:165
1817005992622,3cyclictest1391-21snmpd20:09:085
181700599260,24cyclictest0-21swapper/520:26:595
181700199260,22cyclictest0-21swapper/423:21:054
1816996992622,3cyclictest1391-21snmpd19:58:543
1816996992620,5cyclictest1391-21snmpd22:56:113
181699699260,26cyclictest0-21swapper/319:49:153
1816992992622,3cyclictest1391-21snmpd23:17:492
1817014992518,5cyclictest0-21swapper/721:00:517
1817014992518,5cyclictest0-21swapper/700:09:347
1817001992524,1cyclictest0-21swapper/419:46:584
1816996992518,6cyclictest1391-21snmpd00:36:353
1816996992518,5cyclictest0-21swapper/322:10:163
181699699250,25cyclictest0-21swapper/321:31:503
181699699250,25cyclictest0-21swapper/320:54:543
181699699250,23cyclictest0-21swapper/321:50:343
1816992992521,3cyclictest1849117-21awk20:05:162
1816992992521,3cyclictest1391-21snmpd20:51:232
1816987992522,2cyclictest1391-21snmpd22:33:431
1816987992521,3cyclictest1391-21snmpd00:38:141
1816979992521,3cyclictest1391-21snmpd21:28:070
1816979992521,3cyclictest1238-21ntpd23:53:150
1816979992521,3cyclictest1238-21ntpd23:43:150
1816979992520,4cyclictest1391-21snmpd19:38:120
1817014992420,3cyclictest1862852-21cat20:30:157
1817014992420,3cyclictest1391-21snmpd20:13:447
1817014992420,3cyclictest1391-21snmpd20:13:447
1817014992417,5cyclictest0-21swapper/720:45:457
181701499240,22cyclictest0-21swapper/723:59:197
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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