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2026-09-05 - 04:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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 50 highest latencies:
System rack1slot6s.osadl.org (updated Sat Sep 05, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
497699925,79cyclictest0-21swapper/321:42:053
497699915,9cyclictest30000-21idleruntime-cro19:36:513
497599914,80cyclictest0-21swapper/220:06:512
14902910,3sleep1201ktimersoftd/119:42:051
497599904,78cyclictest0-21swapper/220:27:052
497599895,77cyclictest0-21swapper/222:43:352
4975998935,48cyclictest1136-21unixbench_singl21:17:192
497699885,33cyclictest19560-21timerandwakeup20:07:213
497699884,76cyclictest0-21swapper/323:00:083
497699883,78cyclictest29054-21taskset22:50:213
497599884,77cyclictest0-21swapper/222:36:592
497599884,77cyclictest0-21swapper/222:36:592
497599884,32cyclictest0-21swapper/219:42:232
4976998737,43cyclictest14095-21sed17:52:283
497699873,77cyclictest8794-21aten_r1power_en20:41:593
4976998726,54cyclictest19377-21cpu21:47:003
497599875,75cyclictest0-21swapper/220:16:092
497599874,76cyclictest0-21swapper/218:54:432
497599873,78cyclictest0-21swapper/223:01:382
497599873,76cyclictest0-21swapper/221:37:102
497699865,73cyclictest0-21swapper/320:16:513
497699865,30cyclictest0-21swapper/322:52:273
497699864,74cyclictest16803-21ssh20:52:193
497699864,11cyclictest1227-21runrttasks20:21:023
4976998626,53cyclictest0-21swapper/321:26:593
497599865,75cyclictest0-21swapper/220:34:562
497599864,74cyclictest9644-21munin-node20:42:072
497699854,74cyclictest0-21swapper/320:27:253
497599855,30cyclictest0-21swapper/222:27:382
497599854,30cyclictest0-21swapper/221:52:512
497599854,30cyclictest0-21swapper/219:39:542
497599853,76cyclictest0-21swapper/220:50:122
497599853,75cyclictest0-21swapper/222:07:052
4975998521,12cyclictest0-21swapper/220:51:502
4975998514,12cyclictest0-21swapper/220:08:242
497699845,9cyclictest23612-21unixbench-2d21:02:203
497699845,72cyclictest0-21swapper/320:57:113
497599844,31cyclictest0-21swapper/222:12:102
497599843,75cyclictest0-21swapper/219:57:482
257012840,4sleep015-21rcuc/021:56:470
497699833,73cyclictest0-21swapper/321:10:043
4976998326,9cyclictest26143-21crond22:46:443
497599835,71cyclictest0-21swapper/220:26:222
497599834,73cyclictest0-21swapper/221:12:162
497599834,73cyclictest0-21swapper/221:12:162
497599834,72cyclictest0-21swapper/220:37:192
497599834,29cyclictest1227-21runrttasks21:35:272
497599833,74cyclictest0-21swapper/222:47:132
497599833,74cyclictest0-21swapper/221:11:062
497599833,31cyclictest0-21swapper/221:27:022
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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