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2026-09-17 - 11:57

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 100 highest latencies:
System rack5slot3s.osadl.org (updated Thu Sep 17, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
88902239163,25sleep20-21swapper/219:08:152
89132235162,24sleep00-21swapper/019:08:330
88492215144,58sleep10-21swapper/119:07:421
87272203166,24sleep30-21swapper/319:06:073
9125995545,9cyclictest0-21swapper/221:39:212
139752550,3sleep10-21swapper/121:45:131
162482540,3sleep316252-21unixbench_singl00:15:253
302072530,2sleep07-21ksoftirqd/022:20:240
302332510,4sleep230-21rcuc/219:55:142
911299389,13cyclictest19198-21awk20:45:010
226842380,2sleep00-21swapper/020:50:220
222132380,4sleep230-21rcuc/200:30:212
9125993734,2cyclictest0-21swapper/223:31:102
9125993527,3cyclictest0-21swapper/223:37:442
912599340,21cyclictest0-21swapper/221:58:592
912599340,21cyclictest0-21swapper/221:58:592
911299334,13cyclictest25457-21munin-run00:40:010
912599321,15cyclictest0-21swapper/223:52:432
912599321,15cyclictest0-21swapper/222:20:212
911999321,16cyclictest0-21swapper/120:16:421
911299321,15cyclictest24206-21munin-run22:10:010
912599311,13cyclictest0-21swapper/222:11:272
912599310,21cyclictest0-21swapper/222:44:552
911299316,12cyclictest21078-21perf00:30:010
912599301,13cyclictest0-21swapper/222:26:472
912599301,13cyclictest0-21swapper/221:25:192
912599300,18cyclictest0-21swapper/221:20:472
911299302,13cyclictest5033-21munin-run22:40:010
912599291,13cyclictest0-21swapper/221:19:272
912599291,13cyclictest0-21swapper/219:41:152
912599290,11cyclictest0-21swapper/223:28:212
911299292,15cyclictest16038-21munin-run23:05:010
912599285,9cyclictest23782-21sed23:20:172
912599281,13cyclictest0-21swapper/223:01:032
912599281,12cyclictest0-21swapper/223:49:272
912599281,11cyclictest0-21swapper/219:33:412
911999288,18cyclictest0-21swapper/100:10:021
9119992813,12cyclictest22627-21munin-run23:20:011
911299282,12cyclictest3463-21perf23:50:010
251212280,4sleep07-21ksoftirqd/022:10:160
912599279,3cyclictest16770-21tr21:50:212
912599271,9cyclictest0-21swapper/219:25:172
912599271,18cyclictest0-21swapper/221:42:232
912599271,17cyclictest0-21swapper/220:27:392
911999271,9cyclictest8365-21memory22:45:191
911299273,11cyclictest0-21swapper/021:20:010
82422270,1sleep00-21swapper/000:00:130
912599263,9cyclictest22427-40dnf23:17:432
9125992623,2cyclictest0-21swapper/221:06:432
912599261,3cyclictest0-21swapper/200:20:232
912599261,3cyclictest0-21swapper/200:20:232
912599261,11cyclictest0-21swapper/220:55:572
912599260,9cyclictest0-21swapper/200:25:212
912599260,11cyclictest0-21swapper/219:45:132
912599260,10cyclictest0-21swapper/220:40:132
912599260,10cyclictest0-21swapper/219:10:332
912599251,13cyclictest0-21swapper/220:52:032
912599251,12cyclictest0-21swapper/220:49:152
912599251,12cyclictest0-21swapper/220:49:152
912599250,15cyclictest17108-21latency_hist20:40:022
911299253,11cyclictest1830-21/usr/sbin/munin20:05:140
260782250,3sleep341-21ksoftirqd/323:25:213
912599249,3cyclictest0-21swapper/200:01:032
912599241,9cyclictest0-21swapper/219:21:052
912599241,14cyclictest0-21swapper/222:57:282
912599241,13cyclictest0-21swapper/223:58:072
912599241,11cyclictest0-21swapper/222:04:552
912599241,10cyclictest0-21swapper/220:10:512
912599240,12cyclictest0-21swapper/222:06:112
911999247,9cyclictest2-21kthreadd00:30:211
9119992419,3cyclictest0-21swapper/121:55:141
9119992419,3cyclictest0-21swapper/121:55:141
911999241,17cyclictest0-21swapper/121:12:261
9119992410,5cyclictest19190-21awk20:45:011
911299248,6cyclictest0-21swapper/023:24:470
911299240,11cyclictest17619-21perf21:55:010
913099232,8cyclictest0-21swapper/323:17:423
912599231,9cyclictest0-21swapper/220:22:032
912599231,2cyclictest0-21swapper/222:45:112
912599231,13cyclictest0-21swapper/200:19:552
912599231,12cyclictest0-21swapper/221:49:592
912599230,2cyclictest0-21swapper/223:05:272
912599230,2cyclictest0-21swapper/223:05:272
911999239,12cyclictest19766-21kworker/u8:222:33:511
911999231,19cyclictest25777-21munin-run21:00:011
9119992311,5cyclictest0-21swapper/122:56:261
911999230,17cyclictest0-21swapper/123:23:441
154212230,4sleep339-21rcuc/321:50:013
94842221,4sleep19502-21ntp_states20:20:221
913099229,3cyclictest32237-21grep23:40:153
913099221,12cyclictest7452-21/usr/sbin/munin22:45:143
912599229,3cyclictest18457-21runrttasks23:10:132
912599229,3cyclictest0-21swapper/220:01:212
912599227,2cyclictest0-21swapper/219:35:212
912599225,3cyclictest0-21swapper/222:35:172
912599221,8cyclictest0-21swapper/219:18:472
912599221,14cyclictest0-21swapper/221:00:232
912599220,10cyclictest0-21swapper/220:05:152
911999222,11cyclictest6317-21ntp_states22:40:191
911999221,9cyclictest98392cut19:10:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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