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2026-05-12 - 06:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 100 highest latencies:
System rack3slot6s.osadl.org (updated Tue May 12, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1156321390,1sleep121-21rcuc/122:16:021
1799721380,1sleep10-21swapper/121:13:491
29978211495,14sleep30-21swapper/319:06:073
28276211391,15sleep10-21swapper/119:05:011
30002211194,12sleep20-21swapper/219:06:262
30279210981,6sleep00-21swapper/019:09:570
209132920,1sleep220917-21unixbench_multi00:11:022
113922780,0sleep00-21swapper/022:15:530
45232720,0sleep30-21swapper/321:34:273
44722660,1sleep20-21swapper/221:34:222
3031299230,2cyclictest0-21swapper/223:05:112
3031099210,19cyclictest0-21swapper/020:50:130
3031099210,19cyclictest0-21swapper/020:45:120
30312992017,2cyclictest0-21swapper/220:00:102
3031199200,18cyclictest207150irq/24-eth122:50:151
3031199200,18cyclictest0-21swapper/100:31:441
3031199194,3cyclictest28476-21aten2.4_r3power00:20:131
3031199191,3cyclictest0-21swapper/123:26:041
3031199191,16cyclictest5627-21grep21:35:151
3031199190,2cyclictest0-21swapper/121:45:511
3031199190,1cyclictest0-21swapper/122:47:131
3031199190,18cyclictest0-21swapper/122:21:131
3031099190,3cyclictest0-21swapper/019:29:050
178172190,1sleep2301ktimersoftd/221:13:302
3031199187,2cyclictest0-21swapper/120:10:191
3031199186,3cyclictest26996-21cut20:20:151
3031199181,3cyclictest9703-21apt-get21:40:121
3031199181,15cyclictest0-21swapper/123:35:141
3031199181,15cyclictest0-21swapper/121:00:141
3031199181,15cyclictest0-21swapper/119:45:151
3031199180,2cyclictest0-21swapper/122:06:241
3031199180,16cyclictest28370-21munin-node1
3031199180,16cyclictest16305-21timerandwakeup22:56:021
3031199180,16cyclictest0-21swapper/123:40:181
3031099180,16cyclictest0-21swapper/023:45:120
235832180,0sleep337-21rcuc/300:15:003
3031199175,3cyclictest1049-21df_abs00:25:141
3031199171,6cyclictest0-21swapper/123:50:041
3031199171,3cyclictest14088-21diskmemload22:40:181
3031199171,14cyclictest0-21swapper/119:10:151
3031199170,2cyclictest0-21swapper/123:03:231
3031199170,15cyclictest0-21swapper/121:30:121
3031199170,15cyclictest0-21swapper/121:20:141
3031199170,15cyclictest0-21swapper/120:05:171
3031199170,15cyclictest0-21swapper/100:05:421
3031099170,3cyclictest0-21swapper/023:41:050
316922160,0sleep20-21swapper/222:38:192
30312991613,2cyclictest301ktimersoftd/219:15:112
3031199166,2cyclictest0-21swapper/123:20:111
3031199164,3cyclictest3305-21cron19:44:591
3031199164,3cyclictest32687-21aten2.4-expect19:15:111
3031199164,3cyclictest3127-21nscd23:47:111
3031199164,3cyclictest3107-21sh23:17:061
3031199164,3cyclictest2140-21aten2.4-expect19:20:111
3031199164,3cyclictest0-21swapper/122:30:151
3031199164,2cyclictest207150irq/24-eth100:03:171
3031199164,2cyclictest0-21swapper/123:06:031
3031199162,4cyclictest0-21swapper/122:25:451
3031199161,6cyclictest0-21swapper/123:59:521
3031199161,6cyclictest0-21swapper/121:50:111
3031199161,5cyclictest14088-21diskmemload00:10:131
3031199161,4cyclictest5241-21ssh22:10:071
3031199161,3cyclictest0-21swapper/121:59:241
3031199161,3cyclictest0-21swapper/100:36:421
3031199161,2cyclictest0-21swapper/122:03:461
3031199161,2cyclictest0-21swapper/120:40:111
3031199161,13cyclictest0-21swapper/120:26:021
3031199160,8cyclictest0-21swapper/123:30:031
3031199160,7cyclictest0-21swapper/100:15:131
3031199160,3cyclictest24437-21munin-node1
3031199160,3cyclictest0-21swapper/121:05:171
3031199160,2cyclictest0-21swapper/121:25:121
3031199160,1cyclictest0-21swapper/123:13:041
3031199160,14cyclictest0-21swapper/120:00:171
3031099163,2cyclictest11-21rcuc/021:06:020
3031099161,13cyclictest0-21swapper/000:36:050
3031099160,14cyclictest11-21rcuc/000:30:160
232482160,1sleep0101ktimersoftd/021:54:520
3031399152,7cyclictest0-21swapper/322:30:013
3031399151,3cyclictest16850-21ssh00:06:523
30313991510,3cyclictest0-21swapper/322:12:023
3031399150,13cyclictest0-21swapper/322:00:013
3031399150,13cyclictest0-21swapper/321:15:183
3031399150,13cyclictest0-21swapper/320:25:113
3031299150,13cyclictest0-21swapper/222:45:162
3031199154,3cyclictest8709-21fschecks_count20:55:151
3031199154,2cyclictest6254-21munin-node1
3031199153,3cyclictest8725-21df19:35:141
3031199153,3cyclictest4350-21aten2.4_r3power20:45:131
3031199152,3cyclictest17057-21munin-node1
3031199151,3cyclictest7766-21grep19:31:021
3031199150,5cyclictest0-21swapper/121:15:281
3031199150,2cyclictest0-21swapper/119:51:021
3031199150,13cyclictest30488-21munin-node1
3031099152,7cyclictest5003-21copy22:10:000
30310991512,2cyclictest9-21ksoftirqd/021:17:550
30310991510,3cyclictest8874-21ssh21:39:080
3031099150,2cyclictest0-21swapper/023:10:110
3031099150,2cyclictest0-21swapper/000:15:150
3031399141,11cyclictest30554-21ssh23:11:303
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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