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2026-05-16 - 03:36

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 Sat May 16, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2636323470,2sleep375-21kworker/3:1+events21:30:553
416045121870,5sleep30-21swapper/320:30:523
413954421840,2sleep3481ktimers/320:06:073
41232762800,2chrt75-21kworker/3:1-events19:50:593
4078617997148,8cyclictest194593-21base6400:20:010
4078622996965,3cyclictest44756-21kworker/u8:2+flush-8:022:21:091
4078622996960,7cyclictest4073570-21kworker/u8:3+flush-8:020:21:061
4078622996556,7cyclictest44756-21kworker/u8:2+flush-8:022:01:051
448152640,6chrt0-21swapper/221:46:072
4078628996455,6cyclictest280-21systemd-journal22:00:012
4078622996457,5cyclictest90084-21kworker/u8:0+events_unbound00:06:021
4078628996358,3cyclictest3250028-21kworker/u8:1+flush-8:020:11:102
4078617996255,4cyclictest174086-21kworker/u8:3+flush-8:000:16:080
4078622996054,4cyclictest4035891-21kworker/u8:0+flush-8:019:16:081
4078622996053,5cyclictest3250028-21kworker/u8:1+flush-8:020:01:061
4078622995748,7cyclictest44699-21ntpq21:46:021
4078622995650,4cyclictest90084-21kworker/u8:0+flush-8:000:11:081
4078622995650,4cyclictest44756-21kworker/u8:2+flush-8:021:51:061
4078622995649,5cyclictest4090800-21kworker/u8:2+flush-8:019:40:011
4078622995643,9cyclictest194130-21apt-get00:19:591
4078622995546,7cyclictest188389-21kworker/u8:1+flush-8:000:21:051
4078617995542,10cyclictest280-21systemd-journal00:05:010
4078628995347,4cyclictest19560-21kworker/u8:4+flush-8:021:21:082
4078622995348,4cyclictest4090800-21kworker/u8:2+flush-8:020:51:031
4078622995348,4cyclictest4090800-21kworker/u8:2+flush-8:020:51:031
4078622995348,3cyclictest72897-21kworker/u8:1+flush-8:022:20:011
4078622995339,10cyclictest280-21systemd-journal19:58:351
4078628995247,3cyclictest203934-21kworker/u8:2+events_unbound00:31:022
4078622995241,7cyclictest280-21systemd-journal23:50:341
4078628995146,3cyclictest72897-21kworker/u8:1+flush-8:022:16:042
4078622995141,8cyclictest4159139-21ntpq20:26:021
40828532500,5chrt0-21swapper/219:11:092
4078617994943,4cyclictest4090884-21apt-get19:20:500
4078622994842,4cyclictest4090800-21kworker/u8:2+flush-8:019:46:011
4078622994842,4cyclictest10803-21apt-get21:15:491
4078622994841,5cyclictest188389-21kworker/u8:1+events_unbound00:26:061
4078622994838,7cyclictest4095551-21latency_hist19:25:011
4078628994739,6cyclictest4090774-21cp19:20:012
4078622994740,5cyclictest29699-21ntpq21:31:021
4078622994737,8cyclictest4664-21ntpq21:06:031
4078622994736,7cyclictest280-21systemd-journal22:57:351
4078622994733,10cyclictest280-21systemd-journal23:46:351
4078617994737,8cyclictest208331-21ntpq00:31:020
4078622994638,4cyclictest4073570-21kworker/u8:3+flush-8:020:40:501
4078622994635,9cyclictest153702-21ntpq23:36:031
4078628994540,4cyclictest19559-21kworker/u8:0+flush-8:022:05:562
4078628994538,5cyclictest280-21systemd-journal20:41:182
4078622994540,4cyclictest90084-21kworker/u8:0+flush-8:023:11:051
4078622994539,4cyclictest4090800-21kworker/u8:2+flush-8:019:30:541
4078622994537,6cyclictest280-21systemd-journal00:37:571
4078622994535,7cyclictest134561-21latency_hist23:20:021
4078617994537,5cyclictest4078453-21latency_hist19:10:000
4078628994439,4cyclictest157444-21kworker/u8:2+events_unbound23:41:072
4078628994436,6cyclictest25460-21store21:30:012
4078622994438,4cyclictest3250028-21kworker/u8:1+flush-8:019:40:521
4078622994438,3cyclictest90084-21kworker/u8:0+events_unbound23:56:071
4078622994436,6cyclictest30853-21apt-get21:35:481
4078622994429,10cyclictest280-21systemd-journal23:20:351
4078617994437,5cyclictest4090800-21kworker/u8:2+flush-8:019:56:060
4078617994435,6cyclictest280-21systemd-journal21:45:010
4078617994434,8cyclictest56075-21diskstats22:00:520
4078628994336,5cyclictest4095558-21apt-get19:25:012
4078622994336,5cyclictest4073570-21kworker/u8:3+flush-8:022:41:061
41528032420,1sleep2371rcuc/220:20:592
4078628994237,4cyclictest3250028-21kworker/u8:1+flush-8:020:06:082
4078622994236,4cyclictest4160339-21apt-get20:30:481
4078622994235,5cyclictest72897-21kworker/u8:1+flush-8:022:31:021
4078622994232,7cyclictest4073570-21kworker/u8:3+flush-8:021:26:031
4078622994135,4cyclictest72897-21kworker/u8:1+events_unbound22:36:011
4078622994134,5cyclictest44756-21kworker/u8:2+flush-8:022:26:091
4078622994134,5cyclictest4073570-21kworker/u8:3+events_unbound19:11:021
4078617994132,7cyclictest4083482-21latency_hist19:15:010
4078622994036,3cyclictest90084-21kworker/u8:0+flush-8:022:51:111
4078617994035,4cyclictest90084-21kworker/u8:0+flush-8:022:56:060
4078617994033,5cyclictest188389-21kworker/u8:1+flush-8:000:26:020
4078622993932,5cyclictest44756-21kworker/u8:2+flush-8:022:11:041
4078622993930,6cyclictest4090800-21kworker/u8:2+flush-8:020:36:051
4078617993931,5cyclictest4173967-21ntpq20:41:020
4078617993928,9cyclictest51119-21diskstats21:55:530
40737872394,10sleep10-21swapper/119:05:111
4078628993833,4cyclictest3250028-21kworker/u8:1+events_unbound19:41:042
4078622993834,3cyclictest4073570-21kworker/u8:3+events_unbound20:05:531
4078622993833,3cyclictest154927-21apt-get23:40:471
4078622993830,6cyclictest4073570-21kworker/u8:3+flush-8:019:51:021
4078622993828,7cyclictest5841-21/usr/sbin/munin21:11:001
4078617993826,9cyclictest89218-21ntpq22:31:040
4078617993810,23cyclictest10530-21kworker/0:0+events23:05:010
2134402380,5sleep20-21swapper/200:36:052
4078622993733,3cyclictest90084-21kworker/u8:0+events_unbound23:31:071
4078622993728,6cyclictest4099835-21ntpq19:26:031
4078617993731,5cyclictest90084-21kworker/u8:0+flush-8:000:11:050
4078617993730,5cyclictest139539-21apt-get23:25:020
4078617993729,6cyclictest280-21systemd-journal21:41:270
4078617993728,7cyclictest4164036-21ntpq20:31:020
4078622993629,4cyclictest4073570-21kworker/u8:3+events_unbound21:56:031
4078622993627,7cyclictest104056-21ntpq22:46:041
4078617993627,7cyclictest90084-21kworker/u8:0+flush-8:023:45:590
4078622993528,5cyclictest280-21systemd-journal23:03:351
4078622993525,8cyclictest204610-21apt-get00:30:491
407861799353,26cyclictest4125452-21kworker/0:2+events20:15:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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