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2026-03-15 - 09:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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.

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 100 highest latencies:
System rackeslot6s.osadl.org (updated Sun Mar 15, 2026 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3837877996915,5cyclictest3838700-21munin-node19:15:010
3837877996253,5cyclictest0-21swapper/000:15:120
3837877995652,3cyclictest0-21swapper/021:30:110
3837877995652,3cyclictest0-21swapper/021:30:110
3837881995445,7cyclictest311ktimers/220:30:012
3837880995345,4cyclictest3865235-21apt21:50:001
3837877995239,8cyclictest0-21swapper/000:10:010
383787799521,48cyclictest3869408-21mailstats22:10:260
3837880995142,5cyclictest3847421-21grep20:05:011
383787799492,43cyclictest0-21swapper/020:30:110
383787799492,43cyclictest0-21swapper/020:30:110
3837881994838,5cyclictest3872051-21unixbench_singl22:25:282
3837880994840,5cyclictest3885876-21munin-plugin-st23:50:001
3837880994839,6cyclictest3860157-21cron21:20:001
3837880994811,33cyclictest22-21rcuc/121:40:181
3837877994841,4cyclictest3880710-21run-parts23:19:590
3837877994833,10cyclictest15-21rcuc/023:05:130
3837877994815,26cyclictest15-21rcuc/021:50:010
3837880994734,8cyclictest3856718-21unixbench_singl20:55:271
3837881994637,5cyclictest0-21swapper/200:05:002
3837880994632,9cyclictest0-21swapper/122:20:271
3837880994630,11cyclictest0-21swapper/119:15:011
3837880994626,12cyclictest0-21swapper/121:10:201
383788099462,19cyclictest22-21rcuc/123:00:021
383787799466,7cyclictest0-21swapper/019:35:000
383787799461,41cyclictest3852902-21/usr/sbin/munin20:35:210
3837881994529,10cyclictest0-21swapper/220:00:202
3837880994510,18cyclictest0-21swapper/121:05:181
3837877994539,3cyclictest167350irq/118-8000000.ethernet-tx021:35:240
3837880994436,4cyclictest0-21swapper/119:25:291
3837880994436,4cyclictest0-21swapper/119:25:291
3837880994432,8cyclictest0-21swapper/119:20:011
3837880994432,7cyclictest0-21swapper/100:20:291
3837880994432,7cyclictest0-21swapper/100:20:291
3837880994431,9cyclictest0-21swapper/123:55:281
3837880994431,7cyclictest3884072-21grep23:35:281
3837880994431,7cyclictest3884072-21grep23:35:281
3837880994431,7cyclictest3874567-21grep22:40:261
3837877994429,11cyclictest0-21swapper/023:55:270
383787799442,39cyclictest0-21swapper/020:10:190
3837881994335,4cyclictest3866108-21apt-config21:55:012
3837881994332,8cyclictest3881450-21unixbench_multi23:20:282
3837881994332,8cyclictest3881450-21unixbench_multi23:20:282
3837881994327,10cyclictest0-21swapper/219:40:282
3837881994323,15cyclictest311ktimers/200:25:132
3837880994332,6cyclictest3855749-21grep20:50:271
3837880994332,6cyclictest0-21swapper/122:25:191
3837880994331,8cyclictest0-21swapper/121:20:261
3837880994330,8cyclictest0-21swapper/100:35:281
3837880994328,11cyclictest231ktimers/100:00:151
383788099432,6cyclictest0-21swapper/122:05:021
3837877994328,11cyclictest0-21swapper/020:55:280
383787799431,18cyclictest0-21swapper/021:20:010
3837881994229,9cyclictest0-21swapper/219:45:272
3837881994229,7cyclictest0-21swapper/220:15:292
3837880994233,5cyclictest167450irq/126-8000000.ethernet-tx123:00:191
3837880994232,6cyclictest0-21swapper/120:10:261
3837880994229,9cyclictest0-21swapper/122:50:281
3837880994229,8cyclictest3865968-21grep21:50:271
3837880994223,13cyclictest231ktimers/119:40:121
383787799424,13cyclictest14-21rcu_preempt22:00:000
3837877994235,5cyclictest3855857-21munin-plugin-st20:55:000
3837877994234,5cyclictest3867547-21phc2sys22:00:250
3837877994230,7cyclictest131ktimers/019:15:290
3837877994227,10cyclictest0-21swapper/021:20:180
383787799421,38cyclictest3885874-21munin-run23:50:000
383787799421,38cyclictest0-21swapper/022:35:110
383787799421,38cyclictest0-21swapper/019:55:240
383787799421,2cyclictest0-21swapper/022:30:020
383788199418,28cyclictest0-21swapper/223:10:292
383788199418,28cyclictest0-21swapper/223:10:282
3837881994123,13cyclictest311ktimers/200:15:122
3837880994133,4cyclictest167450irq/126-8000000.ethernet-tx119:55:181
3837880994132,6cyclictest808-21crond19:50:001
3837880994130,8cyclictest0-21swapper/119:50:281
3837880994127,9cyclictest0-21swapper/120:35:171
3837880994127,8cyclictest0-21swapper/122:15:301
3837880994126,6cyclictest0-21swapper/119:30:211
3837877994134,4cyclictest3859180-21tr21:10:270
3837877994123,15cyclictest0-21swapper/022:15:190
3837877994118,21cyclictest0-21swapper/022:20:260
383787799411,3cyclictest0-21swapper/020:20:020
3837881994028,8cyclictest0-21swapper/223:25:282
3837881994028,8cyclictest0-21swapper/223:25:282
3837881994028,8cyclictest0-21swapper/222:00:292
3837880994024,9cyclictest0-21swapper/100:10:191
3837880994022,10cyclictest0-21swapper/123:05:271
3837877994034,3cyclictest167350irq/118-8000000.ethernet-tx022:05:180
3837877994034,3cyclictest0-21swapper/020:05:270
3837877994033,4cyclictest0-21swapper/019:50:150
3837877994030,5cyclictest0-21swapper/020:00:220
3837877994026,8cyclictest0-21swapper/000:20:210
3837877994026,8cyclictest0-21swapper/000:20:210
383788199398,24cyclictest3889332-21kworker/u8:1-events_power_efficient00:21:192
383788199398,24cyclictest3889332-21kworker/u8:1-events_power_efficient00:21:182
3837881993932,4cyclictest0-21swapper/221:20:262
3837881993930,4cyclictest0-21swapper/221:25:292
3837881993928,8cyclictest0-21swapper/220:30:292
3837881993928,8cyclictest0-21swapper/220:30:292
3837881993928,7cyclictest0-21swapper/221:15:292
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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