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2026-08-13 - 16:23

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 Aug 13, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
9397222180,2sleep3575-21kworker/3:2+events11:57:533
40555642750,3chrt575-21kworker/3:2-events08:02:513
3999895996154,5cyclictest115620-21apt-get12:20:001
41242432570,4chrt0-21swapper/109:12:511
3999892995448,4cyclictest4150542-21base6409:40:010
41613412510,2chrt575-21kworker/3:2+events09:52:453
3999892994637,6cyclictest80754-21latency_hist11:45:010
3999895994540,3cyclictest4026788-21kworker/u8:2+events_unbound08:27:451
3999895994439,4cyclictest3182930-21kworker/u8:4+events_unbound07:15:021
3999895994437,5cyclictest3182930-21kworker/u8:4+flush-8:008:38:011
3999895994437,5cyclictest131123-21apt-get12:37:401
3999895994436,6cyclictest4026788-21kworker/u8:2+flush-8:008:52:541
3999895994338,3cyclictest41288-21kworker/u8:2+events_unbound11:22:461
3999895994338,3cyclictest4026788-21kworker/u8:2+flush-8:007:52:511
3999895994338,3cyclictest3182930-21kworker/u8:4+events_unbound08:57:531
3999895994337,4cyclictest4026788-21kworker/u8:2+flush-8:008:22:561
3999895994335,7cyclictest4026788-21kworker/u8:2+flush-8:007:36:501
3999895994335,6cyclictest4004760-21latency_hist07:15:011
3999895994235,5cyclictest3967825-21kworker/u8:1+flush-8:008:32:541
3999892994236,4cyclictest4175667-21kworker/u8:0+flush-8:010:47:500
3999895994137,3cyclictest4175667-21kworker/u8:0+events_unbound11:02:541
3999895994135,5cyclictest3182930-21kworker/u8:4+flush-8:007:57:591
3999895994135,4cyclictest4180662-21kworker/u8:3+events_unbound10:42:531
3999895994135,4cyclictest3182930-21kworker/u8:4+flush-8:009:23:021
3999895994135,4cyclictest3182930-21kworker/u8:4+flush-8:009:17:591
3999892994134,5cyclictest3182930-21kworker/u8:4+flush-8:008:37:470
3999892994133,5cyclictest65878-21latency_hist11:30:010
1051842410,4sleep10-21swapper/112:08:021
3999895994033,5cyclictest4165776-21kworker/u8:2+flush-8:010:27:561
3999895994029,3cyclictest3182930-21kworker/u8:4+flush-8:009:47:491
3999892994035,4cyclictest4026788-21kworker/u8:2+flush-8:008:12:570
3999892994032,6cyclictest105492-21latency_hist12:10:010
3999892994030,7cyclictest75772-21latency_hist11:40:010
3999897993931,6cyclictest275-21systemd-journal07:30:002
3999895993935,3cyclictest4106189-21kworker/u8:0+events_unbound09:07:461
3999895993934,3cyclictest95803-21kworker/u8:3+events_unbound12:05:011
3999895993834,3cyclictest4125933-21kworker/u8:1+flush-8:009:32:591
3999895993833,4cyclictest3182930-21kworker/u8:4+flush-8:008:17:461
3999895993831,5cyclictest3967825-21kworker/u8:1+flush-8:008:07:561
3999892993834,3cyclictest4165776-21kworker/u8:2+flush-8:010:02:490
3999892993834,3cyclictest3967825-21kworker/u8:1+events_unbound08:07:450
3999895993733,3cyclictest4140796-21kworker/u8:0+flush-8:009:42:511
3999895993732,3cyclictest86384-21diskstats11:52:441
3999895993731,4cyclictest4106189-21kworker/u8:0+events_unbound09:02:561
3999895993632,3cyclictest41288-21kworker/u8:2+events_unbound11:42:431
3999895993630,4cyclictest4016666-21kworker/u8:0+flush-8:007:28:011
3999895993629,5cyclictest41288-21kworker/u8:2+flush-8:011:29:251
3999892993627,6cyclictest85686-21latency_hist11:50:010
3999895993531,3cyclictest41288-21kworker/u8:2+events_unbound11:37:481
3999895993531,3cyclictest4026788-21kworker/u8:2+events_unbound07:47:501
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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