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2026-07-31 - 10:41

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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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 20 highest latencies:
System rackeslot4s.osadl.org (updated Fri Jul 31, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2410164995754,2cyclictest2711665-21kworker/u8:0+flush-259:000:05:001
2410169995548,4cyclictest2451932-21latency_hist19:50:013
2410169994844,3cyclictest2576621-21kworker/u8:2+flush-259:022:21:073
2410169994842,4cyclictest2684845-21kworker/u8:2+flush-259:023:40:003
2410164994845,2cyclictest2457116-21kworker/u8:0+events_unbound20:30:011
2410159994744,2cyclictest211rcuc/023:55:010
2410167994640,4cyclictest335557-21systemd-journal20:20:082
2410164994542,2cyclictest2498874-21kworker/u8:2+flush-259:020:45:241
2410164994541,3cyclictest2529707-21kworker/u8:3+flush-259:021:15:001
2410169994338,3cyclictest2737095-21gpgv00:25:003
2410164994138,2cyclictest2529707-21kworker/u8:3+flush-259:021:45:001
2410164993731,4cyclictest335557-21systemd-journal22:04:081
2410159993731,3cyclictest335557-21systemd-journal21:47:080
2410159993731,3cyclictest335557-21systemd-journal21:47:080
2410169993632,3cyclictest2721472-21kworker/u8:4+flush-259:000:20:003
2410167993631,3cyclictest2628512-21latency_hist22:40:012
2410164993529,4cyclictest2675076-21kworker/u8:1+flush-259:023:35:001
2410164993431,3cyclictest2675076-21kworker/u8:1+events_unbound00:38:111
2410164993430,3cyclictest2607228-21kworker/u8:1+events_unbound22:30:231
2410164993430,2cyclictest2576621-21kworker/u8:2+flush-259:022:20:211
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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