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2026-08-22 - 19:13

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 Sat Aug 22, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
149682323610,6sleep30-21swapper/307:52:423
15148192670,3chrt201rcuc/008:07:520
1453698995749,6cyclictest1733545-21latency_hist11:50:010
1453698995651,4cyclictest1475591-21kworker/u8:3+events_unbound08:47:540
1453701995550,3cyclictest1733560-21kworker/u8:0+flush-8:012:00:001
1453701995549,4cyclictest1453578-21kworker/u8:2+events_unbound09:05:001
1453698995550,3cyclictest1694289-21kworker/u8:2+events_unbound11:40:000
1453701995348,4cyclictest1555064-21kworker/u8:0+flush-8:009:42:521
1453701995145,4cyclictest1609999-21kworker/u8:3+events_unbound10:00:011
1453701995045,4cyclictest1733560-21kworker/u8:0+flush-8:012:07:531
1453701995045,4cyclictest1733560-21kworker/u8:0+flush-8:012:07:531
1453701995043,5cyclictest1505781-21kworker/u8:1+flush-8:008:02:381
1453701994943,5cyclictest1505781-21kworker/u8:1+flush-8:008:22:521
1453701994943,4cyclictest1555064-21kworker/u8:0+events_unbound10:27:381
1453701994843,3cyclictest1694289-21kworker/u8:2+events_unbound11:32:541
1453701994842,5cyclictest1694289-21kworker/u8:2+flush-8:011:12:441
1453701994841,5cyclictest1580294-21kworker/u8:4+flush-8:009:22:481
1453701994837,8cyclictest275-21systemd-journal11:06:181
1453698994838,8cyclictest1739170-21diskstats11:57:390
16431852470,3sleep3575-21kworker/3:2-events10:17:453
1453701994739,6cyclictest1630013-21apt-get10:07:351
1453703994639,5cyclictest1565163-21base6409:00:002
1453701994641,4cyclictest1418855-21kworker/u8:1+events_unbound07:17:531
1453701994640,5cyclictest1669310-21kworker/u8:0+events_unbound10:52:431
1453701994540,4cyclictest1718561-21kworker/u8:3+flush-8:012:02:531
1453701994540,4cyclictest1555064-21kworker/u8:0+flush-8:009:47:441
1453703994435,7cyclictest275-21systemd-journal09:20:002
1453701994440,3cyclictest1426351-21kworker/u8:0+flush-8:007:22:501
1453701994439,3cyclictest1555064-21kworker/u8:0+events_unbound08:57:371
1453701994438,5cyclictest1475591-21kworker/u8:3+flush-8:008:47:501
1453701994438,4cyclictest1694289-21kworker/u8:2+flush-8:011:22:581
1453701994438,4cyclictest1570142-21kworker/u8:1+flush-8:009:07:441
1453701994437,5cyclictest1718561-21kworker/u8:3+flush-8:011:52:501
1453701994340,2cyclictest1758506-21kworker/u8:3+events_unbound12:17:431
1453701994338,4cyclictest1580294-21kworker/u8:4+flush-8:009:27:391
1453701994338,3cyclictest1418855-21kworker/u8:1+flush-8:007:42:431
1453701994338,3cyclictest1418855-21kworker/u8:1+flush-8:007:42:431
1453701994337,5cyclictest1654044-21kworker/u8:1+events_unbound11:17:471
1453701994337,4cyclictest1418855-21kworker/u8:1+flush-8:007:52:501
1453701994337,4cyclictest1418855-21kworker/u8:1+flush-8:007:37:521
1453701994336,5cyclictest1727898-21ntpq11:42:491
1453701994336,5cyclictest1599836-21kworker/u8:2+flush-8:010:22:501
144905324327,10sleep10-21swapper/107:06:581
1453701994238,3cyclictest1453578-21kworker/u8:2+flush-8:008:20:011
1453701994237,4cyclictest1748203-21kworker/u8:2+events_unbound12:27:371
1453701994236,5cyclictest1773446-21kworker/u8:1+flush-8:012:37:431
1453701994236,4cyclictest1748203-21kworker/u8:2+flush-8:012:22:491
1453701994235,5cyclictest1475591-21kworker/u8:3+flush-8:008:12:501
1453701994234,5cyclictest275-21systemd-journal10:42:181
1453701994232,7cyclictest1474934-21ntpq07:27:521
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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