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2026-05-28 - 15:55

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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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Thu May 28, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
378973621820,2sleep3481ktimers/307:26:003
406134121090,3sleep375-21kworker/3:1-events12:00:473
3768592996861,5cyclictest3768448-21kworker/u8:2+flush-8:009:15:561
3768592996760,6cyclictest3820180-21kworker/u8:0+flush-8:008:00:581
3768592996660,5cyclictest3860185-21kworker/u8:1+flush-8:010:20:001
3768592996558,5cyclictest3835238-21kworker/u8:3+flush-8:008:15:571
3768592996457,5cyclictest3949181-21kworker/u8:2+flush-8:011:20:531
3768592996358,4cyclictest3914275-21kworker/u8:2+events_unbound09:40:511
3768592996258,3cyclictest4043662-21kworker/u8:1+events_unbound12:35:541
3768592996257,3cyclictest3860185-21kworker/u8:1+flush-8:010:10:571
3768592996156,4cyclictest3768448-21kworker/u8:2+flush-8:007:55:561
3768592996156,4cyclictest3410608-21kworker/u8:0+flush-8:007:10:561
3768592996055,4cyclictest4043662-21kworker/u8:1+flush-8:011:45:541
3768592996054,5cyclictest3768448-21kworker/u8:2+flush-8:009:20:511
3768592995953,5cyclictest4043662-21kworker/u8:1+flush-8:012:25:571
3768592995952,5cyclictest3949181-21kworker/u8:2+flush-8:011:00:551
3768592995853,4cyclictest4043662-21kworker/u8:1+flush-8:012:30:571
3768592995853,4cyclictest3983490-21kworker/u8:0+events_unbound11:35:511
3768592995853,3cyclictest3860185-21kworker/u8:1+events_unbound09:30:421
3768592995852,5cyclictest3909310-21kworker/u8:3+events_unbound11:30:541
3768592995651,4cyclictest3983490-21kworker/u8:0+flush-8:012:20:551
3768592995651,3cyclictest3909310-21kworker/u8:3+flush-8:009:35:571
3768592995650,4cyclictest3730869-21kworker/u8:1+events_unbound07:20:431
3768592995647,7cyclictest3948574-21ntpq10:05:521
38041052550,3chrt75-21kworker/3:1-events07:40:483
3768592995551,3cyclictest4043662-21kworker/u8:1+events_unbound12:05:411
3768589995545,7cyclictest4053715-21latency_hist11:55:010
3768592995449,4cyclictest3815001-21kworker/u8:1+events_unbound08:10:541
3768592995448,4cyclictest3949181-21kworker/u8:2+events_unbound10:30:451
3768592995447,5cyclictest3909310-21kworker/u8:3+flush-8:009:55:571
3768592995447,5cyclictest3795391-21kworker/u8:3+events_unbound07:40:481
3768592995348,4cyclictest3820180-21kworker/u8:0+events_unbound08:05:561
3768592995347,5cyclictest3860185-21kworker/u8:1+events_unbound09:45:561
3768592995347,5cyclictest3410608-21kworker/u8:0+events_unbound07:15:031
3768592995247,4cyclictest3983490-21kworker/u8:0+flush-8:012:15:571
3768592995246,4cyclictest3768448-21kworker/u8:2+events_unbound08:35:421
3768592995246,4cyclictest3768448-21kworker/u8:2+events_unbound08:35:421
3768589995247,4cyclictest3899751-21kworker/u8:0+flush-8:009:30:560
3768592995147,3cyclictest3860185-21kworker/u8:1+events_unbound10:20:431
3768592995146,4cyclictest3768448-21kworker/u8:2+events_unbound07:50:461
3768592995146,3cyclictest3835238-21kworker/u8:3+events_unbound08:45:451
3768592995145,5cyclictest3949181-21kworker/u8:2+events_unbound10:55:531
3768592995144,5cyclictest3949181-21kworker/u8:2+events_unbound11:40:421
3768589995140,8cyclictest3878855-21ntpq08:55:540
39530592500,5sleep3451irq_work/310:10:483
3768589995041,7cyclictest3989530-21/usr/sbin/munin10:50:560
3768589995041,7cyclictest3989530-21/usr/sbin/munin10:50:560
3768592994944,3cyclictest3909310-21kworker/u8:3+flush-8:010:35:521
3768592994943,5cyclictest3835238-21kworker/u8:3+events_unbound08:50:481
3768589994942,5cyclictest1704890-21systemd-journal10:00:500
3768592994843,4cyclictest3860185-21kworker/u8:1+events_unbound09:05:481
3768592994842,4cyclictest3835238-21kworker/u8:3+flush-8:008:20:421
3768592994841,5cyclictest3768448-21kworker/u8:2+flush-8:009:10:531
3768592994742,4cyclictest3949181-21kworker/u8:2+flush-8:010:25:471
3768592994742,4cyclictest3860185-21kworker/u8:1+flush-8:010:45:001
3768592994742,3cyclictest3949181-21kworker/u8:2+events_unbound11:15:591
3768592994740,5cyclictest3874777-21kworker/u8:0+flush-8:009:00:531
3768589994737,8cyclictest1704890-21systemd-journal09:10:010
3768592994642,3cyclictest3949181-21kworker/u8:2+events_unbound11:30:011
3768592994641,4cyclictest3768448-21kworker/u8:2+flush-8:008:40:551
3768589994632,10cyclictest1704890-21systemd-journal07:15:500
3768594994537,6cyclictest4043628-21apt-get11:45:002
3768592994540,4cyclictest4043662-21kworker/u8:1+events_unbound11:55:511
3768589994541,3cyclictest3410608-21kworker/u8:0+events_unbound07:10:400
40521712440,2sleep30-21swapper/311:50:473
3768592994439,4cyclictest3909310-21kworker/u8:3+flush-8:011:10:571
3768592994439,4cyclictest3768448-21kworker/u8:2+flush-8:009:25:581
3768592994438,4cyclictest3949181-21kworker/u8:2+events_unbound11:05:461
3768589994433,8cyclictest4008168-21ntpq11:05:520
3768589994338,4cyclictest3909310-21kworker/u8:3+flush-8:011:30:560
3768589994338,4cyclictest3768448-21kworker/u8:2+flush-8:009:20:570
3768589994337,4cyclictest3835238-21kworker/u8:3+events_unbound08:15:560
3768594994235,5cyclictest4068576-21apt-get12:10:032
3768592994239,2cyclictest3835238-21kworker/u8:3+flush-8:008:25:581
3768592994238,3cyclictest4043662-21kworker/u8:1+flush-8:011:50:561
3768592994235,5cyclictest3914275-21kworker/u8:2+flush-8:009:50:451
3768592994232,8cyclictest4062720-21ntpq12:00:491
3768589994238,3cyclictest3949181-21kworker/u8:2+flush-8:011:20:570
40494692410,5sleep20-21swapper/211:50:432
3768592994135,4cyclictest3983490-21kworker/u8:0+flush-8:010:50:471
3768592994135,4cyclictest3983490-21kworker/u8:0+flush-8:010:50:471
3768589994137,3cyclictest4043662-21kworker/u8:1+flush-8:012:35:550
3768589994135,4cyclictest3795391-21kworker/u8:3+events_unbound07:50:510
3768589994134,6cyclictest3835238-21kworker/u8:3+events_unbound08:25:530
3768589994132,7cyclictest3874758-21latency_hist08:55:020
3768592994036,3cyclictest3934438-21kworker/u8:0+flush-8:010:00:571
3768592994035,4cyclictest3768448-21kworker/u8:2+flush-8:008:30:491
3768592994035,4cyclictest3768448-21kworker/u8:2+flush-8:008:30:491
3768589994034,5cyclictest3768448-21kworker/u8:2+flush-8:008:35:550
3768589994034,5cyclictest3768448-21kworker/u8:2+flush-8:008:35:540
3768589994034,4cyclictest3983490-21kworker/u8:0+events_unbound12:20:520
3768589993929,7cyclictest1704890-21systemd-journal09:20:010
3768592993831,5cyclictest4043662-21kworker/u8:1+events_unbound12:10:011
3768589993833,3cyclictest3914275-21kworker/u8:2+events_unbound09:50:440
3768589993832,4cyclictest3949181-21kworker/u8:2+events_unbound10:25:410
40927382370,2sleep3481ktimers/312:30:573
3768589993632,3cyclictest3768448-21kworker/u8:2+events_unbound09:10:550
3768594993529,4cyclictest3884693-21gpgv09:05:012
3768594993525,8cyclictest1704890-21systemd-journal07:52:502
3768592993528,5cyclictest3810038-21latency_hist07:50:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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