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2026-07-17 - 09:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Fri Jul 17, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
124729221050,3chrt584-21kworker/3:2+events21:37:593
1096371996655,8cyclictest1257690-21latency_hist21:50:000
1096371995749,6cyclictest1187617-21cp20:40:010
1096372995548,5cyclictest1072020-21kworker/u8:1+flush-8:019:27:421
1096372995548,5cyclictest1072020-21kworker/u8:1+flush-8:019:27:411
1096371995545,7cyclictest1377359-21latency_hist23:50:010
1096371995446,5cyclictest1108095-21latency_hist19:20:000
1096371995346,5cyclictest1273385-21/usr/sbin/munin22:07:420
13985432520,4chrt0-21swapper/300:12:353
1096371995140,8cyclictest1182566-21latency_hist20:35:000
1096371995042,6cyclictest1147935-21latency_hist20:00:020
1096372994943,4cyclictest1327875-21kworker/u8:2+flush-8:023:17:321
1096372994941,6cyclictest1287629-21kworker/u8:1+flush-8:022:37:431
1096372994742,4cyclictest1072020-21kworker/u8:1+flush-8:019:37:421
1096372994642,3cyclictest1172191-21kworker/u8:3+flush-8:020:47:271
1096372994541,3cyclictest733430-21kworker/u8:0+flush-8:019:22:281
1096372994539,5cyclictest1172191-21kworker/u8:3+flush-8:020:42:281
1096377994435,6cyclictest281-21systemd-journal00:30:012
1096372994439,4cyclictest1072020-21kworker/u8:1+flush-8:019:42:271
1096372994437,5cyclictest1218324-21apt-get21:12:241
1096372994338,4cyclictest733430-21kworker/u8:0+flush-8:019:47:401
1096371994337,4cyclictest733430-21kworker/u8:0+flush-8:019:37:320
1096372994237,4cyclictest1072020-21kworker/u8:1+events_unbound19:15:021
1096372994136,4cyclictest733430-21kworker/u8:0+flush-8:020:37:291
1096372994135,4cyclictest1366690-21kworker/u8:1+flush-8:000:22:431
1096372994135,4cyclictest1352812-21apt-get23:27:211
1096372994130,8cyclictest281-21systemd-journal00:35:011
1096371994137,3cyclictest1217913-21kworker/u8:2+flush-8:021:32:390
1096371994135,4cyclictest1361021-21kworker/u8:2+flush-8:000:27:280
1096377994034,4cyclictest1322489-21kworker/u8:0+events_unbound23:57:412
1096377994034,4cyclictest1322489-21kworker/u8:0+events_unbound23:57:412
1096372994035,4cyclictest733430-21kworker/u8:0+flush-8:020:22:451
1096371994034,5cyclictest1208228-21kworker/u8:0+events_unbound21:22:460
1096371994030,8cyclictest1122229-21ntpq19:32:360
1096372993935,3cyclictest1192946-21kworker/u8:1+flush-8:020:52:411
1096372993934,4cyclictest1118373-21kworker/u8:3+flush-8:019:52:291
1096371993931,6cyclictest1198070-21/usr/sbin/munin20:52:350
1096371993931,5cyclictest281-21systemd-journal23:40:000
1096377993833,4cyclictest1208228-21kworker/u8:0+flush-8:022:00:012
1096372993833,4cyclictest1118373-21kworker/u8:3+flush-8:019:57:271
1096372993832,4cyclictest1387215-21apt-get00:00:001
1096372993832,4cyclictest1387215-21apt-get00:00:001
1096372993832,4cyclictest1258120-21apt-get21:52:241
1096372993830,5cyclictest281-21systemd-journal23:10:401
1096371993831,5cyclictest1342292-21kworker/u8:1+events_unbound23:22:270
1096372993730,5cyclictest1203240-21apt-get20:57:231
1096372993729,6cyclictest1172191-21kworker/u8:3+events_unbound21:02:261
1096371993732,4cyclictest1138023-21kworker/u8:2+flush-8:020:02:450
1096371993732,3cyclictest0-21swapper/000:00:000
1096371993732,3cyclictest0-21swapper/000:00:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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