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2026-08-30 - 05:46

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 Sun Aug 30, 2026 00:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
147372244169,24sleep20-21swapper/219:06:272
150092229154,24sleep30-21swapper/319:09:573
146872203167,24sleep00-21swapper/019:05:480
147412202165,24sleep10-21swapper/119:06:291
327921800,5sleep21510699cyclictest22:20:182
313421640,4sleep01509699cyclictest22:20:160
85321400,5sleep21510699cyclictest21:00:242
85321400,5sleep21510699cyclictest21:00:242
2893821220,1sleep20-21swapper/222:05:172
151069910299,2cyclictest0-21swapper/221:37:172
147882540,2sleep00-21swapper/000:00:170
253542490,4sleep011-21rcuc/000:25:130
297962460,1sleep10-21swapper/100:35:131
15096993913,12cyclictest28956-21munin-run19:40:010
1509699386,15cyclictest15417-21munin-run22:50:010
1511399350,21cyclictest0-21swapper/322:56:223
1509699356,13cyclictest14797-21munin-run21:35:020
1509699356,13cyclictest13830-40updatedb00:00:010
1511399341,26cyclictest0-21swapper/323:28:583
1510199328,4cyclictest827-21runrttasks00:06:481
15101993215,3cyclictest9284-21grep20:05:261
15113993119,3cyclictest29038-21irqstats22:05:183
1511399311,19cyclictest0-21swapper/319:52:523
1511399311,12cyclictest7149-21memory21:15:183
1509699313,13cyclictest8824-21munin-run22:35:010
190502300,5sleep11510199cyclictest00:10:141
15113993015,8cyclictest0-21swapper/322:13:503
1511399301,12cyclictest0-21swapper/322:03:223
15113993011,11cyclictest0-21swapper/323:10:343
15101993025,2cyclictest261982sleep120:45:181
15101993013,4cyclictest5716-21ntp_states22:25:221
1510199301,17cyclictest29922-21if_enp1s019:40:171
1509699302,13cyclictest23595-21munin-run21:55:010
311992290,1sleep00-21swapper/019:45:010
15113992916,7cyclictest0-21swapper/322:15:303
1511399291,13cyclictest0-21swapper/323:33:103
1511399291,10cyclictest0-21swapper/323:51:263
1510699292,14cyclictest5066-40dnf19:56:102
1509699296,11cyclictest26425-21idleruntime-cro23:15:010
15113992813,8cyclictest0-21swapper/322:34:463
1511399281,14cyclictest0-21swapper/322:41:023
1511399281,13cyclictest0-21swapper/323:04:543
1511399281,11cyclictest0-21swapper/319:45:163
1511399280,11cyclictest0-21swapper/321:52:063
1510199282,10cyclictest13829-21munin-run00:00:011
106832280,2sleep10-21swapper/123:50:191
15113992716,3cyclictest0-21swapper/300:27:383
1511399271,18cyclictest0-21swapper/319:36:183
1511399270,13cyclictest0-21swapper/323:05:463
1510199274,20cyclictest2149-21switchtime23:30:221
1510199272,21cyclictest2236-21munin-run22:20:011
1510199272,15cyclictest0-21swapper/100:28:271
1509699274,11cyclictest563-21perf23:30:010
1509699271,13cyclictest11632-21munin-run23:55:010
15113992614,3cyclictest0-21swapper/322:37:583
1510699261,3cyclictest0-21swapper/222:29:532
1510199262,21cyclictest16636-21/usr/sbin/munin19:10:241
1510199261,22cyclictest579-21systemd-journal23:25:011
1510199261,16cyclictest0-21swapper/121:56:471
1511399259,8cyclictest0-21swapper/300:08:423
1511399259,3cyclictest0-21swapper/320:43:503
1511399258,11cyclictest0-21swapper/322:45:343
1511399251,13cyclictest0-21swapper/300:04:343
1511399251,11cyclictest0-21swapper/323:22:023
1511399251,10cyclictest0-21swapper/319:34:463
1511399250,12cyclictest0-21swapper/320:50:223
1511399250,12cyclictest0-21swapper/320:14:583
1510199252,2cyclictest538-21latency_hist23:30:011
1510199251,21cyclictest28727-21cat23:20:011
1510199251,21cyclictest15350-21expr21:35:131
1510199251,21cyclictest14414-21users21:30:261
1510199251,21cyclictest11545-21missed_timers21:25:191
15101992510,3cyclictest9246-21irqstats21:20:181
15101992510,3cyclictest28411-21irqstats20:50:181
101182251,3sleep2808-21snmpd21:21:322
1511399249,10cyclictest0-21swapper/323:55:103
1511399248,3cyclictest0-21swapper/320:49:273
15113992413,3cyclictest0-21swapper/322:23:343
1511399241,17cyclictest0-21swapper/323:40:543
1511399241,11cyclictest0-21swapper/321:10:023
1511399240,12cyclictest0-21swapper/300:17:463
1510199245,6cyclictest19589-40dnf22:57:251
15101992418,3cyclictest23500-21memory19:25:181
1510199241,3cyclictest19592-21timerandwakeup19:15:261
1510199241,20cyclictest26394-21cat23:14:561
1510199241,20cyclictest25701-21memory19:30:201
15101992411,3cyclictest0-21swapper/122:20:211
1510199241,11cyclictest6335-21ntp_states23:40:211
1510199241,11cyclictest31933-21perl19:45:151
1510199241,11cyclictest20558-21tune2fs23:00:141
1510199241,11cyclictest1-21systemd21:00:011
1509699248,14cyclictest24864-21perf00:25:010
1509699241,11cyclictest20473-21perf00:15:010
1511399238,8cyclictest0-21swapper/300:36:103
1511399238,3cyclictest0-21swapper/322:25:463
1511399238,10cyclictest0-21swapper/321:56:063
1511399237,11cyclictest0-21swapper/323:37:223
1511399236,3cyclictest0-21swapper/321:25:503
1511399236,11cyclictest0-21swapper/321:21:223
15113992313,3cyclictest0-21swapper/300:33:503
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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