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2026-07-08 - 15:14

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 Wed Jul 08, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2415029066,8sleep00-21swapper/007:08:430
2415029066,8sleep00-21swapper/007:08:430
2286428975,9sleep20-21swapper/207:05:232
2286428975,9sleep20-21swapper/207:05:232
2410028269,9sleep30-21swapper/307:08:053
2410028269,9sleep30-21swapper/307:08:053
2411528164,13sleep10-21swapper/107:08:161
2411528164,13sleep10-21swapper/107:08:161
2434199300,3cyclictest0-21swapper/110:55:381
2434399290,28cyclictest0-21swapper/209:15:192
2434399280,27cyclictest0-21swapper/210:51:472
2434399280,26cyclictest0-21swapper/210:29:382
2434199281,21cyclictest31114-21awk12:10:211
2434399270,27cyclictest0-21swapper/211:48:012
2434399270,23cyclictest0-21swapper/212:00:032
24346992616,7cyclictest39-21ksoftirqd/310:33:323
2434399260,24cyclictest0-21swapper/210:58:382
24341992618,7cyclictest0-21swapper/108:00:241
2433699261,1cyclictest0-21swapper/010:29:020
24346992525,0cyclictest0-21swapper/309:32:513
24346992514,6cyclictest39-21ksoftirqd/309:29:063
2434199250,0cyclictest0-21swapper/110:46:021
2433699250,19cyclictest0-21swapper/009:20:020
24343992423,1cyclictest0-21swapper/212:18:222
2434399240,24cyclictest0-21swapper/209:54:022
2434399240,0cyclictest0-21swapper/210:03:132
2434399230,23cyclictest0-21swapper/210:49:462
2434399230,22cyclictest0-21swapper/211:38:042
24341992312,8cyclictest537-21snmpd09:18:461
2433699231,21cyclictest0-21swapper/012:26:190
24346992219,2cyclictest39-21ksoftirqd/312:05:113
2434399220,3cyclictest0-21swapper/211:23:202
2434399220,22cyclictest0-21swapper/212:24:492
2434199220,14cyclictest0-21swapper/109:20:061
2433699220,2cyclictest0-21swapper/009:11:510
2433699220,1cyclictest0-21swapper/011:13:390
2434399212,1cyclictest0-21swapper/212:30:542
2434399210,3cyclictest0-21swapper/211:01:592
2434399210,21cyclictest0-21swapper/212:08:502
2434399210,21cyclictest0-21swapper/210:37:132
2434399210,21cyclictest0-21swapper/210:37:122
2433699210,2cyclictest0-21swapper/012:39:300
2433699210,1cyclictest0-21swapper/010:37:140
2433699210,1cyclictest0-21swapper/010:37:140
24343992019,1cyclictest0-21swapper/211:34:472
2434199200,20cyclictest0-21swapper/111:27:041
2434199200,17cyclictest0-21swapper/110:15:131
24336992017,2cyclictest13-21ksoftirqd/008:45:010
2433699200,20cyclictest0-21swapper/011:47:290
2433699200,20cyclictest0-21swapper/009:41:500
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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