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2026-09-06 - 06:37

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 20 highest latencies:
System rackeslot3s.osadl.org (updated Sun Sep 06, 2026 00:45:26)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
921614998517,32cyclictest1004091-21latency_hist23:55:020
921616998320,20cyclictest984970-21ssh23:13:411
921616998121,19cyclictest959172-21ssh22:17:251
921616998120,23cyclictest979990-21ssh23:02:351
921616998021,23cyclictest1003509-21ssh23:53:591
921616997927,16cyclictest977638-21ssh22:57:271
921616997927,16cyclictest977638-21ssh22:57:271
921616997822,17cyclictest922847-21munin-run19:35:011
921616997822,17cyclictest922847-21munin-run19:35:011
921614997826,5cyclictest16850irq/134-800000000:00:050
921616997622,17cyclictest986732-21ssh23:17:231
921616997622,17cyclictest986732-21ssh23:17:231
921614997626,13cyclictest947766-21ssh21:52:320
921616997427,14cyclictest992032-21sh23:28:521
921616997422,15cyclictest998438-21ssh23:42:531
921616997421,16cyclictest928902-21ssh21:12:011
921616997421,15cyclictest961552-21ssh22:22:251
921616997419,21cyclictest971332-21ssh22:43:501
921616997419,15cyclictest1007096-21ssh00:01:481
921616997418,22cyclictest938578-21ssh21:32:501
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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