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2025-05-02 - 12:33

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 Fri May 02, 2025 00:44:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14350062275269,4sleep20-21swapper/219:09:092
14350622248229,12sleep70-21swapper/719:09:547
14348242245205,13sleep00-21swapper/019:06:420
14347942237218,12sleep60-21swapper/619:06:166
14348292234216,11sleep50-21swapper/519:06:475
14349052233215,12sleep30-21swapper/319:07:493
14327432233215,11sleep40-21swapper/419:05:094
14349272231212,12sleep10-21swapper/119:08:041
143533899360,36cyclictest0-21swapper/121:24:211
1435338993433,1cyclictest1426-21snmpd23:27:041
1435342993332,1cyclictest1426-21snmpd22:15:512
1435336993331,2cyclictest1426-21snmpd23:03:100
1435355993231,1cyclictest1426-21snmpd21:43:387
1435355993231,1cyclictest1426-21snmpd21:43:387
143535599310,30cyclictest0-21swapper/720:13:097
143535399319,22cyclictest0-21swapper/620:08:476
143534999310,0cyclictest0-21swapper/523:12:585
1435355993030,0cyclictest0-21swapper/719:49:217
1435347993029,1cyclictest0-21swapper/420:01:504
143533899300,30cyclictest0-21swapper/123:45:251
1435355992926,3cyclictest0-21swapper/719:40:197
1435338992929,0cyclictest0-21swapper/120:13:091
1435344992827,1cyclictest1579711-21irqstats_NMI23:30:193
1435338992828,0cyclictest0-21swapper/119:49:211
1435336992827,1cyclictest0-21swapper/023:30:190
1435355992721,5cyclictest1461968-21cat19:55:197
1435349992726,1cyclictest1280-21lldpd19:16:305
1435344992727,0cyclictest0-21swapper/322:22:213
1435344992726,1cyclictest1475228-21df20:20:153
143535599260,25cyclictest0-21swapper/720:37:457
143535399260,26cyclictest0-21swapper/600:17:426
1435342992622,2cyclictest0-21swapper/223:37:232
1435336992624,2cyclictest1348047-21kworker/0:2+mm_percpu_wq20:20:150
1435336992623,2cyclictest0-21swapper/022:41:390
1435336992621,3cyclictest0-21swapper/022:32:510
1435355992522,2cyclictest1426-21snmpd22:06:537
143534999253,21cyclictest0-21swapper/519:56:595
1435349992524,1cyclictest0-21swapper/522:34:275
1435349992522,2cyclictest1426-21snmpd23:51:385
143534999250,24cyclictest0-21swapper/523:36:235
1435347992525,0cyclictest1057337-21kworker/4:2+events20:43:454
1435347992525,0cyclictest1057337-21kworker/4:2+events20:37:554
1435347992521,3cyclictest1426-21snmpd00:15:124
1435347992520,4cyclictest0-21swapper/420:34:064
1435344992521,4cyclictest0-21swapper/300:00:163
1435342992525,0cyclictest0-21swapper/200:34:342
1435342992522,2cyclictest1426-21snmpd21:09:432
1435338992524,1cyclictest1426-21snmpd22:37:511
1435338992521,3cyclictest1426-21snmpd21:38:471
1435338992520,4cyclictest1426-21snmpd19:17:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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