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2025-09-17 - 12:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Wed Sep 17, 2025 00:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
230372242165,26sleep10-21swapper/119:08:581
230722207167,27sleep00-21swapper/019:09:250
230972204167,24sleep30-21swapper/319:09:453
229842204167,25sleep20-21swapper/219:08:192
23217991160,2cyclictest0-21swapper/220:46:202
23217996764,2cyclictest0-21swapper/220:03:022
23217996764,2cyclictest0-21swapper/220:03:022
190222540,4sleep011-21rcuc/021:25:170
232032470,5sleep011-21rcuc/000:05:140
249152460,3sleep123-21ksoftirqd/100:10:011
23206993910,13cyclictest28608-21awk23:05:010
2320699367,13cyclictest22310-21idleruntime-cro20:20:010
23217993313,3cyclictest30704-21kworker/2:222:39:232
267172310,4sleep011-21rcuc/020:30:010
2322299292,5cyclictest0-21swapper/321:15:253
236832280,5sleep323686-21fschecks_time21:35:163
2322299281,12cyclictest26208-21pmu-power00:10:243
2320699282,13cyclictest6904-21munin-run19:45:010
88322270,1sleep28834-21sort23:30:282
2321299276,6cyclictest0-21swapper/120:47:191
2322299261,4cyclictest0-21swapper/300:36:193
2321799261,11cyclictest30704-21kworker/2:222:49:372
2321799261,11cyclictest11636-21kworker/2:100:06:252
2321299261,22cyclictest0-21swapper/120:15:171
2320699261,12cyclictest10990-21munin-run22:25:010
2322299251,10cyclictest0-21swapper/321:29:453
2321799251,6cyclictest0-21swapper/221:48:192
2321299253,3cyclictest22494-21expr22:50:131
2320699251,10cyclictest0-21swapper/022:10:200
2320699251,10cyclictest0-21swapper/022:10:200
19762250,3sleep011-21rcuc/022:00:130
65562240,5sleep36559-21needreboot20:55:213
2322299240,4cyclictest16944-21kworker/u8:222:40:243
2321799248,3cyclictest30704-21kworker/2:222:25:212
2321799244,7cyclictest32-21ksoftirqd/220:23:452
2321799243,5cyclictest86550irq/126-enp1s0-20:55:312
23217992412,3cyclictest30704-21kworker/2:220:41:592
23217992411,3cyclictest30704-21kworker/2:223:09:112
2321299242,3cyclictest30475-21munin-run19:25:011
2321299242,14cyclictest86750irq/128-enp1s0-23:15:121
2321299242,14cyclictest86750irq/128-enp1s0-23:15:121
2321299241,9cyclictest0-21swapper/122:18:251
2321299241,9cyclictest0-21swapper/120:15:011
2320699241,10cyclictest0-21swapper/022:44:310
2322299236,4cyclictest0-21swapper/321:55:553
2322299231,12cyclictest31942-21memory23:10:223
2322299231,11cyclictest0-21swapper/322:03:523
2321799235,7cyclictest32-21ksoftirqd/220:19:152
2321799233,2cyclictest86550irq/126-enp1s0-21:43:212
2321799232,6cyclictest0-21swapper/200:14:082
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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