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2026-01-10 - 02:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot1s.osadl.org (updated Sat Jan 10, 2026 00:44:11)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1537521370,3sleep30-21swapper/321:00:503
1537521370,3sleep30-21swapper/321:00:503
1453421330,2chrt142-21systemd-journal22:25:471
246252960,1sleep10-21swapper/121:25:491
123872810,3sleep30-21swapper/322:20:433
123872810,3sleep30-21swapper/322:20:433
38542780,1sleep10-21swapper/120:30:491
80972760,3sleep30-21swapper/323:35:443
80972760,3sleep30-21swapper/323:35:443
277772660,2sleep127780-21sed20:10:351
277772660,2sleep127780-21sed20:10:351
100562600,2chrt10058-21grep19:20:461
5619995951,4cyclictest0-21swapper/000:00:440
5619995951,4cyclictest0-21swapper/000:00:440
181342550,7sleep1281ktimers/122:35:481
181342550,7sleep1281ktimers/122:35:481
4532510,3sleep10-21swapper/121:50:371
185282500,2sleep20-21swapper/200:05:342
185282500,2sleep20-21swapper/200:05:342
127872500,2chrt0-21swapper/323:50:283
127872500,2chrt0-21swapper/323:50:283
5619994821,16cyclictest21307-21taskset21:19:290
5619994821,16cyclictest21307-21taskset21:19:290
28612480,3sleep20-21swapper/220:30:342
5619994722,9cyclictest4956-21taskset23:26:080
5619994722,9cyclictest4956-21taskset23:26:080
5619994722,9cyclictest16968-21taskset22:33:450
5619994721,14cyclictest29882-21taskset23:06:380
5619994721,14cyclictest29882-21taskset23:06:380
5619994720,11cyclictest6111-21taskset20:36:270
5619994720,11cyclictest6111-21taskset20:36:270
5619994720,11cyclictest6111-21taskset20:36:270
5619994720,11cyclictest12656-21seq23:49:000
5619994720,11cyclictest12656-21seq23:49:000
5619994719,18cyclictest4460-21runrttasks20:34:180
5619994718,12cyclictest21766-21chrt00:11:030
5619994718,12cyclictest21766-21chrt00:11:030
5619994625,12cyclictest0-21swapper/022:29:150
5619994620,11cyclictest32375-21seq21:46:550
5619994620,11cyclictest32375-21seq21:46:550
5619994619,15cyclictest749-21runrttasks20:43:270
5619994619,11cyclictest26706-21taskset21:31:480
5619994619,11cyclictest26706-21taskset21:31:480
5619994619,11cyclictest16463-21seq00:00:050
5619994619,11cyclictest16463-21seq00:00:050
5619994619,11cyclictest16463-21seq00:00:050
233932460,4sleep30-21swapper/319:55:503
233932460,4sleep30-21swapper/319:55:503
5619994521,9cyclictest18862-21taskset22:39:120
5619994521,9cyclictest18862-21taskset22:39:120
5619994521,14cyclictest13063-21chrt22:21:280
5619994521,14cyclictest13063-21chrt22:21:280
5619994521,10cyclictest10437-21taskset19:21:090
5619994520,15cyclictest3800-21taskset21:57:480
5619994520,15cyclictest3800-21taskset21:57:480
5619994520,15cyclictest3800-21taskset21:57:480
5619994520,12cyclictest23843-21chrt00:18:430
5619994520,12cyclictest23843-21chrt00:18:430
5619994520,12cyclictest23843-21chrt00:18:430
5619994519,11cyclictest2598-21taskset20:29:190
5619994519,11cyclictest19447-21taskset21:14:390
5619994519,11cyclictest19447-21taskset21:14:390
5619994519,10cyclictest630-21taskset20:23:530
5619994519,10cyclictest630-21taskset20:23:530
5619994518,12cyclictest28567-21taskset21:36:450
5619994518,12cyclictest28567-21taskset21:36:450
5619994518,11cyclictest5656-21seq22:02:220
5619994518,11cyclictest5656-21seq22:02:220
5619994518,11cyclictest1418-21taskset23:18:550
5619994518,11cyclictest1418-21taskset23:18:550
5619994517,13cyclictest7662-21taskset22:09:150
5619994517,13cyclictest7662-21taskset22:09:150
5619994421,9cyclictest29170-21taskset20:11:590
5619994420,13cyclictest31229-21taskset20:19:260
5619994420,13cyclictest31229-21taskset20:19:260
5619994420,13cyclictest31229-21taskset20:19:260
5619994420,10cyclictest15570-21taskset21:02:480
5619994420,10cyclictest15570-21taskset21:02:480
5619994419,11cyclictest18049-21taskset19:42:590
5619994419,11cyclictest18049-21taskset19:42:590
5619994419,10cyclictest23006-21taskset21:22:070
5619994419,10cyclictest23006-21taskset21:22:070
5619994418,11cyclictest21775-21chrt19:52:570
5619994417,12cyclictest8883-21seq23:38:390
5619994417,12cyclictest8883-21seq23:38:390
5619994416,13cyclictest17341-21seq21:06:380
5619994416,13cyclictest17341-21seq21:06:380
5619994416,12cyclictest24465-21taskset22:54:060
5619994322,6cyclictest31227-21taskset00:37:280
5619994322,6cyclictest31227-21taskset00:37:280
5619994322,6cyclictest31227-21taskset00:37:280
5619994320,8cyclictest13645-21taskset20:57:200
5619994320,8cyclictest13645-21taskset20:57:200
5619994320,8cyclictest13645-21taskset20:57:200
5619994319,7cyclictest16133-21seq19:37:340
5619994319,7cyclictest16133-21seq19:37:340
5619994319,11cyclictest30505-21taskset21:41:500
5619994319,11cyclictest30505-21taskset21:41:500
5619994319,10cyclictest25595-21taskset00:22:010
5619994319,10cyclictest25595-21taskset00:22:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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