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2026-08-11 - 23:20

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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack1slot6s.osadl.org (updated Tue Aug 11, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23672991077,47cyclictest1227-21runrttasks10:55:300
236729910414,46cyclictest0-21swapper/011:25:000
725921010,4sleep37254-21ssh10:10:203
23673991018,85cyclictest22426-21gltestperf09:45:101
23673991014,48cyclictest15001-21aten_r1power_en09:35:021
236729910116,44cyclictest19725-21seq08:51:230
2194991010,7rtkit-daemon0-21swapper/208:20:522
2367599974,28cyclictest0-21swapper/307:20:223
2367399974,45cyclictest0-21swapper/108:10:171
2367399973,10cyclictest0-21swapper/111:21:311
23673999630,13cyclictest0-21swapper/109:41:251
2367599954,24cyclictest0-21swapper/309:50:013
23675999529,8cyclictest21567-21ssh11:21:323
2367399954,43cyclictest0-21swapper/110:13:331
2367599935,29cyclictest0-21swapper/310:04:493
2367599933,9cyclictest9542-21unixbench_singl08:35:283
2367599933,9cyclictest9542-21unixbench_singl08:35:283
2367399933,49cyclictest0-21swapper/109:25:131
2367399933,44cyclictest0-21swapper/109:55:201
2367399933,44cyclictest0-21swapper/109:55:201
2367599924,35cyclictest32388-21df10:50:033
23675999221,13cyclictest0-21swapper/308:15:133
23675999220,28cyclictest5242-21fschecks_time08:30:093
23673999232,7cyclictest23710-21interrupts11:25:071
2367399923,43cyclictest0-21swapper/110:40:081
2367599914,27cyclictest0-21swapper/311:00:213
23675999125,12cyclictest0-21swapper/308:25:133
2367599904,28cyclictest0-21swapper/309:40:183
2367599904,28cyclictest0-21swapper/307:55:153
2367599904,28cyclictest0-21swapper/307:55:153
23673999033,9cyclictest8648-21gltestperf08:35:141
23673999033,9cyclictest8648-21gltestperf08:35:141
23675998921,13cyclictest0-21swapper/308:02:033
23675998912,11cyclictest0-21swapper/310:48:073
2367399893,45cyclictest0-21swapper/108:30:081
2367599884,28cyclictest0-21swapper/310:15:163
2367599884,27cyclictest0-21swapper/309:55:193
2367599884,27cyclictest0-21swapper/309:55:193
23673998834,9cyclictest1205-21telnet08:25:081
2367399883,47cyclictest0-21swapper/109:08:301
2367599874,24cyclictest0-21swapper/309:30:563
23675998726,19cyclictest4674-21ssh10:06:543
23675998718,13cyclictest0-21swapper/308:40:053
2367399873,45cyclictest0-21swapper/111:18:441
23673998727,12cyclictest0-21swapper/109:32:291
219499870,4rtkit-daemon2193-21rtkit-daemon06:42:410
2367599868,21cyclictest0-21swapper/309:38:133
2367599864,27cyclictest0-21swapper/306:38:273
2367599864,12cyclictest0-21swapper/310:39:483
2367599863,30cyclictest0-21swapper/308:09:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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