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2026-06-20 - 10:19

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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Sat Jun 20, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1257170995550,3cyclictest1360761-21kworker/u8:2+events_unbound21:05:010
1257183995446,5cyclictest1444185-21latency_hist22:10:013
1257183995446,5cyclictest1444185-21latency_hist22:10:003
1257170995046,2cyclictest1433818-21kworker/u8:3+events_unbound22:30:190
1257176994943,4cyclictest1350756-21latency_hist20:40:012
1257183994841,5cyclictest335557-21systemd-journal00:30:013
1257183994841,5cyclictest335557-21systemd-journal00:30:003
1257183994742,4cyclictest1381633-21gpgv21:10:013
1257173994742,4cyclictest1407874-21cp21:35:001
1257176994337,4cyclictest1267811-21latency_hist19:20:002
1257170994340,2cyclictest1429057-21apt-get21:55:110
1257176994135,4cyclictest1262227-21apt-get19:15:012
1257170994137,3cyclictest1350795-21kworker/u8:0+flush-259:021:05:360
1257176994035,3cyclictest335557-21systemd-journal20:15:362
1257176993935,3cyclictest1490329-21kworker/u8:0+flush-259:000:00:252
1257170993935,3cyclictest1574042-21kworker/u8:0+flush-259:000:35:010
1257170993935,3cyclictest1574042-21kworker/u8:0+flush-259:000:35:000
1257170993935,3cyclictest1262189-21kworker/u8:1+flush-259:019:30:200
1257183993832,4cyclictest1469802-21kworker/u8:2+flush-259:022:50:003
1257176993834,3cyclictest1521388-21kworker/u8:1+flush-259:023:35:272
1257170993835,2cyclictest1209701-21kworker/u8:3+flush-259:019:45:200
1257183993731,4cyclictest1209701-21kworker/u8:3+flush-259:019:55:163
1257170993633,2cyclictest1387377-21kworker/u8:4+events_unbound21:25:190
1257170993632,3cyclictest1433818-21kworker/u8:3+events_unbound22:57:360
1257170993531,3cyclictest1574042-21kworker/u8:0+events_unbound00:18:570
1257170993531,3cyclictest1324903-21apt-get20:13:560
1257173993429,3cyclictest1531643-21apt-get23:35:011
1257170993430,3cyclictest1381236-21kworker/u8:1+flush-259:022:00:150
1257170993330,2cyclictest1433818-21kworker/u8:3+flush-259:022:10:220
1257170993329,3cyclictest1439298-21kworker/u8:0+events_unbound22:19:360
1257170993329,3cyclictest1360761-21kworker/u8:2+events_unbound21:14:370
1257183993228,3cyclictest1537285-21kworker/u8:2+flush-259:023:55:003
1257176993227,4cyclictest1490329-21kworker/u8:0+events_unbound23:25:232
1257173993228,3cyclictest335557-21systemd-journal00:27:581
1257173993228,3cyclictest335557-21systemd-journal00:27:571
1257170993228,3cyclictest1490329-21kworker/u8:0+flush-259:023:25:170
1257170993227,4cyclictest1511111-21kworker/u8:2+flush-259:023:20:110
1257183993124,5cyclictest1579093-21gpgv00:20:013
1257183993124,5cyclictest1532272-21cp23:35:023
1257176993127,3cyclictest1360761-21kworker/u8:2+flush-259:021:00:262
1257173993124,5cyclictest1401689-21ntpq21:25:181
1257173993123,6cyclictest1568244-21apt-get00:09:591
1257170993127,3cyclictest1531524-21kworker/u8:3+events_unbound00:10:240
1257170993126,4cyclictest1558138-21kworker/u8:4+events_unbound00:03:480
1257173993027,2cyclictest1433818-21kworker/u8:3+events_unbound22:10:271
1257173993024,4cyclictest335557-21systemd-journal19:40:001
1257170993027,2cyclictest1298761-21kworker/u8:4+events_unbound19:54:380
1257170993027,2cyclictest1298761-21kworker/u8:4+events_unbound19:54:380
1257170993027,2cyclictest1262189-21kworker/u8:1+flush-259:020:20:210
1257170993026,3cyclictest1433818-21kworker/u8:3+flush-259:022:40:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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