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2026-03-27 - 16:56

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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.

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 rackeslot4s.osadl.org (updated Fri Mar 27, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1119807994339,3cyclictest1235760-21kworker/u8:0+flush-259:009:05:000
1119812993730,5cyclictest252-21systemd-journal10:05:001
1119819993631,4cyclictest1214675-21apt-get08:40:112
1119807993633,2cyclictest1114213-21kworker/u8:3+events_unbound07:55:140
1119822993530,3cyclictest1355029-21kworker/u8:4+flush-259:011:20:213
1119807993530,4cyclictest1349923-21apt-get10:50:130
1119807993330,2cyclictest1291841-21kworker/u8:1+flush-259:010:10:250
1119807993330,2cyclictest1245491-21kworker/u8:3+events_unbound09:40:230
1119807993229,2cyclictest2267822-21kworker/u8:2+flush-259:007:40:240
1119807993228,3cyclictest1187287-21kworker/u8:3+events_unbound08:35:210
1119807993128,2cyclictest1338980-21kworker/u8:3+events_unbound10:50:000
1119807993128,2cyclictest1235760-21kworker/u8:0+events_unbound09:10:130
1119812993023,5cyclictest1338954-21latency_hist10:40:011
1119807993027,2cyclictest1355029-21kworker/u8:4+events_unbound11:10:200
1119807993026,3cyclictest1442853-21kworker/u8:1+flush-259:012:35:180
1119822992925,3cyclictest2267822-21kworker/u8:2+flush-259:007:45:213
1119822992822,4cyclictest1307647-21latency_hist10:10:013
1119812992823,4cyclictest1266290-21/usr/sbin/munin09:30:151
1119807992822,3cyclictest1235760-21kworker/u8:0+events_unbound09:15:150
1119822992724,2cyclictest2267822-21kworker/u8:2+flush-259:007:55:003
1119822992723,3cyclictest1266075-21kworker/u8:2+flush-259:009:50:003
1119807992724,2cyclictest1421887-21kworker/u8:2+events_unbound12:20:190
1119807992723,3cyclictest1442853-21kworker/u8:1+events_unbound12:25:230
1119822992623,2cyclictest1390800-21kworker/u8:0+flush-259:011:45:243
1119822992623,2cyclictest1235760-21kworker/u8:0+flush-259:009:10:173
1119822992617,3cyclictest1338980-21kworker/u8:3+flush-259:010:55:003
1119807992623,2cyclictest1411203-21kworker/u8:1+flush-259:012:00:240
1119807992623,2cyclictest1291841-21kworker/u8:1+events_unbound10:40:120
1119807992622,3cyclictest1198523-21kworker/u8:1+events_unbound08:40:210
1119807992621,4cyclictest1135967-21apt-get07:25:120
1119807992618,2cyclictest1353897-21kworker/u8:0+events_unbound10:55:230
1119822992522,2cyclictest1421887-21kworker/u8:2+events_unbound12:25:143
1119822992521,3cyclictest1344302-21kworker/u8:2+flush-259:010:45:153
1119822992521,3cyclictest1266075-21kworker/u8:2+flush-259:009:50:153
1119822992521,3cyclictest1266075-21kworker/u8:2+flush-259:009:50:153
1119819992521,3cyclictest1245491-21kworker/u8:3+flush-259:009:40:162
1119819992520,3cyclictest1448256-21apt-get12:25:122
1119812992520,3cyclictest1119811-21latency_hist07:10:001
1119807992522,2cyclictest1344302-21kworker/u8:2+events_unbound11:15:200
1119807992522,2cyclictest1323476-21kworker/u8:0+events_unbound10:35:170
1119807992522,2cyclictest1260657-21kworker/u8:1+flush-259:009:45:150
1119807992522,2cyclictest1187287-21kworker/u8:3+events_unbound08:30:240
1119807992520,4cyclictest1390913-21latency_hist11:30:000
1119819992420,3cyclictest1411203-21kworker/u8:1+flush-259:012:05:142
1119819992419,3cyclictest1260855-21awk09:25:002
1119812992420,3cyclictest1209511-21apt-get08:35:111
1119807992421,2cyclictest1266075-21kworker/u8:2+flush-259:009:55:150
1119807992421,2cyclictest1266075-21kworker/u8:2+flush-259:009:55:140
1119807992421,2cyclictest1235760-21kworker/u8:0+events_unbound09:20:200
1119807992421,2cyclictest1081501-21kworker/u8:1+events_unbound07:10:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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