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2026-04-20 - 22:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot3s.osadl.org (updated Mon Apr 20, 2026 12:45:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1302046999476,12cyclictest1302048-21cat07:10:020
1302051998024,48cyclictest1-21systemd10:15:011
130205899793,41cyclictest1333019-21ssh10:07:223
1302051997334,34cyclictest1-21systemd08:10:011
130205899711,66cyclictest48-21kcompactd010:27:133
1302058996938,28cyclictest3467602-21systemd-journal10:10:423
130205599694,60cyclictest1312724-21ssh09:20:042
1302051996919,46cyclictest23-21ksoftirqd/111:19:081
1302046996929,36cyclictest1-21systemd09:25:010
1302046996929,36cyclictest1-21systemd09:25:000
1302058996833,31cyclictest1392816-21sh12:25:543
1302058996833,31cyclictest1392816-21sh12:25:543
130205899671,62cyclictest1380164-21ssh11:56:423
130205199673,18cyclictest275-21dbus-daemon11:05:001
1302051996721,41cyclictest23-21ksoftirqd/111:41:131
1302046996719,33cyclictest12-21ksoftirqd/009:58:360
130205899661,61cyclictest1356145-21ssh11:00:393
130205199664,12cyclictest284-21systemd-logind07:55:011
130205899652,58cyclictest1313466-21ssh09:21:503
130205899652,58cyclictest1313466-21ssh09:21:503
130205899651,60cyclictest1391067-21ssh12:21:583
130205899651,60cyclictest1387204-21ssh12:13:073
130205899651,60cyclictest1378692-21ssh11:53:223
130205899651,60cyclictest1371214-21ssh11:35:463
130205899651,60cyclictest1361955-21ssh11:14:453
130205899651,60cyclictest1347588-21ssh10:40:593
130205899651,60cyclictest1347588-21ssh10:40:583
130205899651,60cyclictest1325043-21ssh09:49:033
1302051996526,35cyclictest1379035-21sh11:54:191
1302051996526,34cyclictest1366388-21sh11:24:541
130205199652,13cyclictest1336873-21ssh10:16:151
130205199651,14cyclictest1368463-21ssh11:29:481
130205199651,13cyclictest1354589-21ssh10:57:241
1302058996433,28cyclictest1-21systemd10:20:003
130205899642,58cyclictest1385010-21ssh12:08:043
130205899642,56cyclictest1302765-21sshd07:24:523
130205899641,59cyclictest1397241-21ssh12:36:193
130205899641,59cyclictest1397241-21ssh12:36:183
130205899641,59cyclictest1390025-21ssh12:19:533
130205899641,59cyclictest1383581-21ssh12:04:523
130205899641,59cyclictest1376925-21ssh11:49:203
130205899641,59cyclictest1369337-21ssh11:31:273
130205899641,59cyclictest1367959-21ssh11:28:253
130205899641,59cyclictest1358930-21ssh11:07:273
130205899641,59cyclictest1345872-21ssh10:37:133
130205899641,59cyclictest1343804-21ssh10:32:213
130205899641,59cyclictest1339305-21ssh10:21:553
130205899641,59cyclictest1331849-21ssh10:05:003
130205899641,59cyclictest1331849-21ssh10:05:003
130205899641,59cyclictest1322268-21ssh09:42:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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