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2025-12-29 - 13:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Mon Dec 29, 2025 00:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1131015214446,93sleep30-21swapper/319:09:443
113074328655,9sleep20-21swapper/219:06:182
113086728367,10sleep10-21swapper/119:07:501
113074627354,13sleep00-21swapper/019:06:200
1131265992926,1cyclictest0-21swapper/323:19:593
1131265992623,1cyclictest0-21swapper/322:30:143
1131265992623,1cyclictest0-21swapper/322:30:143
1131265992623,1cyclictest0-21swapper/319:24:593
1131265992522,1cyclictest0-21swapper/319:39:593
1131265992321,1cyclictest0-21swapper/323:45:013
1131265992320,1cyclictest0-21swapper/319:25:213
1131265992320,1cyclictest0-21swapper/319:25:203
1131265992320,1cyclictest0-21swapper/300:00:013
13846832221,9sleep11384734-21/usr/sbin/munin23:05:221
113126599221,8cyclictest1212058-21taskset20:21:543
113126599221,15cyclictest0-21swapper/300:20:133
1131265992117,2cyclictest0-21swapper/321:45:003
12966352200,2sleep10-21swapper/121:45:011
1131265992017,1cyclictest0-21swapper/321:00:193
1131265992017,1cyclictest0-21swapper/320:00:143
14452582195,6sleep21445556-21kthreadcore00:05:162
13765872191,11sleep11378267-21cut23:00:211
12019872191,13sleep11202160-21expr20:15:161
1131265991916,1cyclictest0-21swapper/323:25:123
1131265991916,1cyclictest0-21swapper/322:09:593
1131265991916,1cyclictest0-21swapper/319:30:253
1131265991915,2cyclictest0-21swapper/323:25:013
1131265991915,2cyclictest0-21swapper/321:20:003
1131265991915,2cyclictest0-21swapper/319:50:003
113126599191,14cyclictest0-21swapper/322:10:143
113126599191,14cyclictest0-21swapper/319:40:143
113126599191,12cyclictest0-21swapper/321:20:213
113126599191,11cyclictest1175580-21taskset19:50:113
1131265991815,1cyclictest0-21swapper/322:25:153
1131265991815,1cyclictest0-21swapper/322:00:003
1131265991815,1cyclictest0-21swapper/300:10:163
1131265991815,1cyclictest0-21swapper/300:05:173
1131265991814,2cyclictest0-21swapper/322:40:013
113126599181,13cyclictest1306165-21taskset21:50:243
113126599181,13cyclictest0-21swapper/323:50:153
113126599181,13cyclictest0-21swapper/323:10:133
1131265991714,2cyclictest0-21swapper/321:10:193
1131265991713,2cyclictest0-21swapper/300:35:193
113126599171,13cyclictest0-21swapper/323:45:173
113126599171,13cyclictest0-21swapper/320:45:203
113126599171,12cyclictest1444487-21turbostat00:05:003
113126599171,12cyclictest1296814-21chrt21:45:143
113126599171,12cyclictest1217822-21chrt20:30:113
113126599171,11cyclictest1243944-21chrt20:55:003
113126599170,14cyclictest0-21swapper/323:35:143
113126599170,13cyclictest0-21swapper/322:55:163
113126599170,13cyclictest0-21swapper/319:10:123
11393742161,10sleep21139470-21cut19:15:162
113126599161,9cyclictest1380625-21taskset23:05:063
1131265991613,1cyclictest0-21swapper/322:50:113
1131265991613,1cyclictest0-21swapper/322:20:233
1131265991613,1cyclictest0-21swapper/320:35:183
113126599161,13cyclictest0-21swapper/300:25:143
113126599161,12cyclictest1185736-21turbostat20:00:003
113126599161,11cyclictest1249183-21sleep21:00:013
113126599161,10cyclictest1359324-21taskset22:43:553
113126599160,14cyclictest0-21swapper/321:25:273
113126599160,13cyclictest0-21swapper/323:00:193
113126599160,13cyclictest0-21swapper/321:35:203
113126599160,13cyclictest0-21swapper/321:30:133
113126599160,13cyclictest0-21swapper/320:12:323
113126599160,13cyclictest0-21swapper/319:15:153
113126599160,12cyclictest1328237-21chrt22:15:133
113126599160,10cyclictest1232833-21taskset20:40:413
14760372151,9sleep11476230-21cat00:35:011
13748922151,9sleep01374895-21sshd22:57:320
12439072151,5sleep21243932-21perf20:55:012
113126599151,9cyclictest1460127-21taskset00:17:383
113126599151,9cyclictest1412133-21chrt23:34:293
113126599151,2cyclictest0-21swapper/300:30:133
1131265991512,1cyclictest0-21swapper/320:05:163
113126599151,12cyclictest0-21swapper/322:00:203
113126599150,9cyclictest1360082-21taskset22:45:143
113126599150,12cyclictest0-21swapper/321:05:163
113126599150,12cyclictest0-21swapper/320:25:153
113126599150,10cyclictest1206934-21chrt20:19:293
14290932141,9sleep21429117-21/usr/sbin/munin23:50:162
13642652141,9sleep21364266-21sshd22:45:302
13069722141,7sleep21307020-21munin-run21:55:012
12708942147,3sleep11271837-21grep21:20:171
11795842142,7sleep11179638-21ntpq19:50:211
14405322131,8sleep01442169-21tr00:00:170
14725832121,7sleep01473101-21kthreadcore00:30:190
13961362121,7sleep01396215-21cat23:20:000
13348192121,7sleep11336521-21cut22:20:161
13235012121,7sleep01323779-21kthreadcore22:10:170
12394602121,7sleep11239537-21kthreadcore20:50:151
12375792121,6sleep01237667-21ntpq20:45:200
12128542121,6sleep21213063-21hddtemp_smartct20:25:152
12078482121,7sleep01207871-21kthreadcore20:20:190
12068332122,7sleep0800-21snmpd20:18:110
11774992124,4sleep01179260-21cut19:50:160
14714632110,1sleep20-21swapper/200:30:172
14532222111,6sleep11453979-21/usr/sbin/munin00:10:201
13430712110,7sleep21338663-21/usr/sbin/munin22:25:272
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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