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2025-11-13 - 11:51

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Thu Nov 13, 2025 00:44:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
112821424570,8sleep013-21ksoftirqd/019:05:270
12177402990,5chrt0-21swapper/123:19:411
12177402990,5chrt0-21swapper/123:19:411
162399960,9rtkit-daemon1622-21rtkit-daemon00:22:270
162399960,9rtkit-daemon1622-21rtkit-daemon00:22:260
11580122960,4sleep00-21swapper/020:30:150
11835262930,7sleep30-21swapper/321:40:303
162399890,8rtkit-daemon1622-21rtkit-daemon00:33:070
162399880,10rtkit-daemon1622-21rtkit-daemon00:33:571
112853528864,16sleep10-21swapper/119:06:461
162399860,10rtkit-daemon1753-21gnome-shell21:28:203
162399860,10rtkit-daemon0-21swapper/320:08:243
12353692840,5sleep30-21swapper/300:10:023
11888762840,4sleep30-21swapper/321:55:313
11888762840,4sleep30-21swapper/321:55:313
12374382810,8sleep02197014-21PK-Backend00:15:140
11950622800,4chrt1194826-21/usr/sbin/munin22:15:153
11950622800,4chrt1194826-21/usr/sbin/munin22:15:153
162399710,57rtkit-daemon0-21swapper/219:06:022
162399700,5rtkit-daemon0-21swapper/119:20:571
112844827051,13sleep30-21swapper/319:05:403
162399660,36rtkit-daemon1236991-21cat00:15:023
162399620,9rtkit-daemon1622-21rtkit-daemon23:41:190
112894599610,35cyclictest0-21swapper/123:40:291
162399590,9rtkit-daemon1622-21rtkit-daemon19:15:582
162399590,34rtkit-daemon869-21irqbalance20:04:353
112896099570,53cyclictest1622-21rtkit-daemon19:13:073
162399550,9rtkit-daemon1622-21rtkit-daemon19:57:463
1128940995521,16cyclictest13-21ksoftirqd/019:10:300
162399540,8rtkit-daemon1622-21rtkit-daemon19:43:243
12312312540,7sleep30-21swapper/323:55:333
1128960995422,14cyclictest1753-21gnome-shell21:45:393
112894099544,46cyclictest1622-21rtkit-daemon21:51:240
112894099544,46cyclictest1622-21rtkit-daemon21:51:240
162399520,44rtkit-daemon881143-21gmain19:10:492
11846292510,6chrt2197014-21PK-Backend21:45:162
162399500,38rtkit-daemon1753-21gnome-shell23:14:003
162399500,36rtkit-daemon2197014-21PK-Backend21:21:322
162399500,36rtkit-daemon2197014-21PK-Backend20:55:262
162399500,35rtkit-daemon2197014-21PK-Backend21:32:213
162399500,19rtkit-daemon2197014-21PK-Backend23:19:073
162399500,19rtkit-daemon2197014-21PK-Backend23:19:073
1128945995016,19cyclictest0-21swapper/122:40:351
112894599501,28cyclictest1753-21gnome-shell21:11:271
112894599500,27cyclictest1753-21gnome-shell21:18:291
112894599500,26cyclictest1197540-21find22:20:311
11822252490,6sleep00-21swapper/021:40:020
112894599490,25cyclictest0-21swapper/121:27:021
112894099491,16cyclictest13-21ksoftirqd/000:37:450
162399480,33rtkit-daemon2197014-21PK-Backend23:25:242
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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