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2026-05-29 - 22:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 rack7slot7s.osadl.org (updated Fri May 29, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
895021210,0sleep20-21swapper/210:12:272
2312329581,9sleep20-21swapper/207:08:162
2324329165,8sleep00-21swapper/007:09:460
2293528967,6sleep10-21swapper/107:06:351
2294228468,10sleep30-21swapper/307:06:413
233222510,0sleep10-21swapper/112:35:071
113062310,0sleep30-21swapper/312:27:333
2335199260,25cyclictest0-21swapper/211:05:522
2335199260,25cyclictest0-21swapper/211:05:512
2335199250,25cyclictest0-21swapper/209:54:352
2334299252,11cyclictest537-21snmpd09:42:050
2335199230,22cyclictest0-21swapper/210:16:282
2334699232,20cyclictest29917-21unixbench_singl11:40:261
2335199220,22cyclictest0-21swapper/210:39:492
2335199220,21cyclictest0-21swapper/212:36:342
2335199220,21cyclictest0-21swapper/211:48:142
2334699221,20cyclictest22085-21ssh12:15:121
2335199216,8cyclictest23195-21grep10:20:262
2335199210,21cyclictest0-21swapper/211:19:332
2335199210,21cyclictest0-21swapper/211:12:282
23353992019,1cyclictest0-21swapper/309:48:013
2335399200,16cyclictest0-21swapper/310:22:433
23351992018,1cyclictest0-21swapper/212:08:282
2335199200,20cyclictest0-21swapper/210:09:072
23346992019,1cyclictest0-21swapper/112:25:131
23346992019,1cyclictest0-21swapper/110:37:441
23342992019,1cyclictest0-21swapper/012:14:040
23353991918,1cyclictest0-21swapper/310:53:333
23353991910,6cyclictest23008-21apache209:44:013
23351991919,0cyclictest0-21swapper/209:23:132
2335199190,15cyclictest0-21swapper/208:25:132
2334699191,17cyclictest8580-21apt-get08:05:121
2334699190,18cyclictest0-21swapper/110:28:011
2335399180,2cyclictest0-21swapper/311:19:423
2335399180,16cyclictest0-21swapper/312:16:303
2335199180,18cyclictest0-21swapper/211:39:462
2335199180,18cyclictest0-21swapper/211:20:432
2335199180,15cyclictest0-21swapper/212:17:192
2334699181,3cyclictest8960-21kworker/u8:010:11:181
23342991816,1cyclictest0-21swapper/010:10:100
23342991815,2cyclictest94-21kswapd011:04:250
2334299180,18cyclictest0-21swapper/012:03:320
2335399175,8cyclictest13456-21apt-get12:10:123
2335199175,12cyclictest0-21swapper/211:03:472
23351991716,1cyclictest0-21swapper/210:04:092
23351991716,1cyclictest0-21swapper/207:32:242
2335199170,1cyclictest0-21swapper/211:50:382
2335199170,17cyclictest0-21swapper/210:52:082
2335199170,17cyclictest0-21swapper/210:40:502
2335199170,16cyclictest0-21swapper/212:27:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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