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2026-07-23 - 10:46

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 Thu Jul 23, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3885669995547,6cyclictest4093596-21latency_hist22:45:011
3885667995346,5cyclictest4163282-21latency_hist23:55:010
3885669994739,6cyclictest4153624-21kworker/u8:2+flush-8:000:02:551
3885677994440,3cyclictest3838737-21kworker/u8:2+events_unbound21:37:502
3885669994434,7cyclictest4062693-21latency_hist22:05:011
3885667994439,4cyclictest3907536-21kworker/u8:1+flush-8:019:42:430
3885677994235,5cyclictest3972618-21apt-get20:35:002
3885669994236,4cyclictest3907536-21kworker/u8:1+flush-8:020:32:551
3885677994136,4cyclictest4183721-21kworker/u8:1+events_unbound00:37:562
3885677994136,4cyclictest4183721-21kworker/u8:1+events_unbound00:32:472
3885677994036,3cyclictest3972446-21kworker/u8:3+events_unbound22:17:502
3885677994036,3cyclictest3838737-21kworker/u8:2+flush-8:021:13:022
3885667994033,5cyclictest278-21systemd-journal20:32:400
3885667994031,7cyclictest278-21systemd-journal22:55:000
3885677993935,3cyclictest3838737-21kworker/u8:2+flush-8:021:22:432
3885677993934,4cyclictest4103715-21kworker/u8:0+flush-8:022:57:562
3885677993934,4cyclictest4023079-21kworker/u8:1+events_unbound21:27:462
3885677993934,4cyclictest4023079-21kworker/u8:1+events_unbound21:27:462
3885677993834,3cyclictest4103715-21kworker/u8:0+events_unbound23:12:422
3885669993833,4cyclictest3972446-21kworker/u8:3+flush-8:021:12:511
3885667993832,4cyclictest4555-21cron00:35:010
3885667993829,7cyclictest4148439-21latency_hist23:40:000
38809782384,9sleep10-21swapper/119:06:251
3885677993733,3cyclictest3907536-21kworker/u8:1+events_unbound19:47:562
3885667993732,3cyclictest4153624-21kworker/u8:2+events_unbound00:10:000
3885667993727,8cyclictest3913041-21/usr/sbin/munin19:37:480
3885667993726,8cyclictest278-21systemd-journal21:35:000
388566799371,34cyclictest3932437-21munin-run19:55:010
3885677993631,4cyclictest3972446-21kworker/u8:3+events_unbound20:57:562
3885677993628,6cyclictest3942747-21apt-get20:05:002
3885669993630,4cyclictest3932396-21apt-get19:55:001
3885667993632,3cyclictest4138534-21kworker/u8:3+flush-8:000:12:560
3885667993632,3cyclictest4087616-21kworker/u8:1+flush-8:023:22:560
3885667993631,3cyclictest3972446-21kworker/u8:3+flush-8:020:37:500
3885677993531,3cyclictest4153624-21kworker/u8:2+events_unbound23:52:552
3885669993530,4cyclictest3972446-21kworker/u8:3+flush-8:020:42:431
3885669993530,3cyclictest3908826-21irqrtprio19:32:431
3885667993531,3cyclictest3907536-21kworker/u8:1+events_unbound19:32:540
3885677993430,3cyclictest3972446-21kworker/u8:3+events_unbound21:55:022
3885669993429,4cyclictest4153624-21kworker/u8:2+flush-8:000:27:411
3885669993423,8cyclictest278-21systemd-journal23:57:591
3885667993429,4cyclictest4138534-21kworker/u8:3+flush-8:000:22:400
3885667993429,4cyclictest4103715-21kworker/u8:0+flush-8:023:57:420
3885667993428,4cyclictest3943428-21apt-get20:07:370
3885667993427,5cyclictest4173018-21grep00:02:570
3885677993328,3cyclictest4087616-21kworker/u8:1+events_unbound23:45:012
3885667993328,4cyclictest3907536-21kworker/u8:1+flush-8:019:57:410
3885667993326,5cyclictest4183691-21latency_hist00:20:020
3885667993326,3cyclictest3982832-21munin-run20:45:020
3885667993323,8cyclictest4091602-21ntpq22:32:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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