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2026-04-15 - 04:49

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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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 Wed Apr 15, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1633921390,7sleep3610299cyclictest20:25:053
2485991110,7rtkit-daemon0-21swapper/122:08:530
2485991100,7rtkit-daemon0-21swapper/121:13:170
1687921040,6sleep216878-21tail21:14:492
610199944,13cyclictest0-21swapper/220:08:042
6102999324,50cyclictest0-21swapper/320:59:243
610199935,25cyclictest0-21swapper/220:22:452
610199924,81cyclictest0-21swapper/222:24:462
610199924,80cyclictest0-21swapper/221:59:102
610199924,41cyclictest0-21swapper/219:54:442
610199924,26cyclictest0-21swapper/219:26:042
6102999136,37cyclictest17189-21ssh19:39:513
610199914,80cyclictest0-21swapper/221:00:412
610199914,33cyclictest0-21swapper/220:40:362
610199914,33cyclictest0-21swapper/220:40:362
610199914,12cyclictest0-21swapper/220:34:482
610199904,36cyclictest0-21swapper/221:25:032
610199904,36cyclictest0-21swapper/221:25:032
6101999020,62cyclictest3740-21uptime22:30:022
6102998925,46cyclictest0-21swapper/321:06:313
6102998920,12cyclictest0-21swapper/320:05:003
6102998917,12cyclictest0-21swapper/322:02:263
610199894,24cyclictest0-21swapper/221:09:032
6101998910,71cyclictest0-21swapper/219:34:562
610299886,75cyclictest0-21swapper/321:25:293
610299886,75cyclictest0-21swapper/321:25:293
6102998832,41cyclictest778-21awk20:50:063
6101998840,41cyclictest20465-21latency_hist22:09:282
6101998830,14cyclictest0-21swapper/222:34:522
6101998814,30cyclictest0-21swapper/220:27:052
6102998725,48cyclictest0-21swapper/322:42:203
610199874,29cyclictest5213-21ssh21:44:562
610199874,25cyclictest0-21swapper/222:23:322
610199865,34cyclictest1419-21runrttasks19:49:352
610199864,37cyclictest0-21swapper/220:14:592
610199864,26cyclictest0-21swapper/220:33:342
610199864,26cyclictest0-21swapper/220:11:222
6101998632,11cyclictest17236-21sort19:39:512
6101998631,8cyclictest12553-21cpuspeed_turbos18:34:482
610299854,73cyclictest0-21swapper/321:54:433
610299853,73cyclictest0-21swapper/320:40:353
610299853,73cyclictest0-21swapper/320:40:353
610199855,32cyclictest0-21swapper/222:39:352
610199854,36cyclictest0-21swapper/222:09:592
610199854,33cyclictest0-21swapper/217:16:012
610199854,33cyclictest0-21swapper/217:16:012
610299844,73cyclictest0-21swapper/319:19:543
610299843,73cyclictest1419-21runrttasks19:31:053
6102998421,47cyclictest0-21swapper/319:59:223
610199845,33cyclictest0-21swapper/219:46:262
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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