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2026-04-22 - 14:24

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 Wed Apr 22, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
259426521740,3sleep3481ktimers/308:11:143
27126102800,6sleep30-21swapper/310:11:143
2530753996151,7cyclictest2726675-21kworker/u8:2+events_unbound10:26:201
27464852590,3sleep375-21kworker/3:1+mm_percpu_wq10:45:013
2530753995649,6cyclictest2716264-21kworker/u8:1+flush-8:010:16:251
2530753995649,6cyclictest2716264-21kworker/u8:1+flush-8:010:16:251
2530753995646,7cyclictest2652650-21diskstats09:11:101
2530753995548,5cyclictest2741778-21kworker/u8:0+flush-8:010:41:251
2530753995548,5cyclictest2716264-21kworker/u8:1+flush-8:010:51:251
2530753995546,6cyclictest2597628-21kworker/u8:1+flush-8:009:16:201
2530753995447,5cyclictest2477782-21kworker/u8:3+events_unbound08:11:231
2530753995446,6cyclictest2756062-21kworker/u8:3+flush-8:011:01:261
2530753995445,6cyclictest2760979-21kworker/u8:4+flush-8:012:26:191
2530753995347,4cyclictest2493695-21kworker/u8:0+events_unbound07:41:201
2530753995346,4cyclictest2800912-21kworker/u8:1+flush-8:011:51:101
2530753995345,6cyclictest2821244-21kworker/u8:1+flush-8:012:21:211
2530753995344,6cyclictest2641925-21latency_hist09:00:011
2530753995343,7cyclictest2726453-21latency_hist10:25:001
2530749995344,6cyclictest2760979-21kworker/u8:4+flush-8:011:26:110
2530753995246,5cyclictest2641432-21kworker/u8:2+flush-8:009:01:221
2530753995245,5cyclictest2493695-21kworker/u8:0+flush-8:007:11:211
2530753995241,5cyclictest2760979-21kworker/u8:4+flush-8:011:31:111
2530753995144,5cyclictest2641432-21kworker/u8:2+flush-8:009:56:251
2530753995144,5cyclictest2617213-21kworker/u8:3+flush-8:008:46:211
2530757995041,6cyclictest2562640-21cat07:40:012
2530753995045,4cyclictest2641432-21kworker/u8:2+events_unbound09:26:231
2530753995045,3cyclictest2641432-21kworker/u8:2+events_unbound09:36:221
2530753995043,5cyclictest2667102-21kworker/u8:3+flush-8:009:51:181
2530753994945,3cyclictest2510794-21kworker/u8:2+flush-8:007:16:271
2530753994944,3cyclictest2641432-21kworker/u8:2+events_unbound09:41:251
2530749994939,7cyclictest2716537-21latency_hist10:15:000
2530753994842,4cyclictest2760979-21kworker/u8:4+events_unbound11:21:141
2530753994842,4cyclictest2701726-21kworker/u8:0+flush-8:010:06:201
2530753994842,4cyclictest2493695-21kworker/u8:0+flush-8:007:56:251
2530753994842,4cyclictest2493695-21kworker/u8:0+events_unbound09:21:111
2530753994841,5cyclictest2493695-21kworker/u8:0+flush-8:008:21:221
2530749994840,5cyclictest280-21systemd-journal07:50:000
2530753994743,2cyclictest2861212-21latency_hist12:40:001
2530753994742,4cyclictest2821244-21kworker/u8:1+flush-8:012:01:221
2530753994742,3cyclictest2760979-21kworker/u8:4+events_unbound12:20:001
2530753994742,3cyclictest2716264-21kworker/u8:1+flush-8:010:56:251
2530753994742,3cyclictest2716264-21kworker/u8:1+events_unbound10:46:121
2530753994741,5cyclictest2667102-21kworker/u8:3+events_unbound09:46:221
2530753994741,5cyclictest2493695-21kworker/u8:0+flush-8:007:51:231
2530753994740,4cyclictest2510794-21kworker/u8:2+events_unbound07:36:231
2530753994732,11cyclictest280-21systemd-journal11:06:101
2530753994640,4cyclictest2741778-21kworker/u8:0+events_unbound12:06:201
2530753994639,5cyclictest2641432-21kworker/u8:2+flush-8:009:06:221
2530749994636,8cyclictest2705569-21ntpq10:01:210
2530753994537,4cyclictest2641432-21kworker/u8:2+flush-8:009:31:221
2530749994536,7cyclictest280-21systemd-journal12:00:000
2530757994420,21cyclictest2737157-21diskstats10:36:112
2530753994441,2cyclictest2701726-21kworker/u8:0+flush-8:010:01:261
2530753994440,3cyclictest2477782-21kworker/u8:3+events_unbound07:46:261
2530753994438,4cyclictest2760979-21kworker/u8:4+flush-8:011:26:221
2530753994438,4cyclictest2597628-21kworker/u8:1+flush-8:008:16:211
2530753994437,5cyclictest2597628-21kworker/u8:1+flush-8:008:41:221
2530753994338,4cyclictest2667102-21kworker/u8:3+flush-8:010:31:231
2530753994337,3cyclictest2760979-21kworker/u8:4+flush-8:011:46:261
2530753994336,5cyclictest2701726-21kworker/u8:0+flush-8:010:11:221
2530753994336,4cyclictest2493695-21kworker/u8:0+events_unbound07:31:171
2530749994334,7cyclictest2556399-21ntpq07:31:220
25952712420,1sleep00-21swapper/008:11:160
2530757994221,6cyclictest280-21systemd-journal07:44:592
2530753994235,5cyclictest2726675-21kworker/u8:2+flush-8:010:36:211
2530753994137,3cyclictest2617213-21kworker/u8:3+events_unbound08:51:231
2530753994137,3cyclictest2477782-21kworker/u8:3+flush-8:008:06:271
2530753994137,3cyclictest2477782-21kworker/u8:3+flush-8:008:06:261
2530749994134,4cyclictest2756325-21latency_hist10:55:010
2530753994035,3cyclictest2493695-21kworker/u8:0+flush-8:008:31:261
2530753994034,4cyclictest2760979-21kworker/u8:4+events_unbound11:36:231
2530753994031,6cyclictest280-21systemd-journal08:26:101
253074999401,36cyclictest2572513-21munin-run07:50:000
2530757993933,4cyclictest2731382-21apt-get10:30:012
2530753993934,3cyclictest2760979-21kworker/u8:4+events_unbound11:15:011
2530749993932,5cyclictest2662378-21grep09:21:100
2530749993930,6cyclictest2641066-21ntpq08:56:200
2530757993818,3cyclictest2731979-21aten2_r5power_c10:31:092
2530757993817,8cyclictest2825934-21apt-get12:05:002
2530749993829,7cyclictest2657314-21apt-get09:16:060
2530749993829,6cyclictest2781167-21latency_hist11:20:010
2530757993719,2cyclictest0-21swapper/212:00:002
2530753993731,5cyclictest2760979-21kworker/u8:4+events_unbound12:11:211
2530757993620,13cyclictest2617550-21aten2_r5power_c08:36:102
2530757993618,3cyclictest0-21swapper/212:30:002
253075799360,12cyclictest2860622-21python312:36:252
2530757993526,7cyclictest280-21systemd-journal12:16:112
2530757993525,8cyclictest2602374-21awk08:20:002
2530753993523,9cyclictest2856256-21turbostat.cron12:35:001
2530753993429,4cyclictest2741778-21kworker/u8:0+events_unbound11:41:151
2530753993428,4cyclictest2552328-21cron07:30:001
2530749993426,6cyclictest280-21systemd-journal10:06:110
25304992343,6sleep10-21swapper/107:09:141
2530757993317,3cyclictest2661946-21turbostat.cron09:20:002
2530753993329,3cyclictest2741778-21kworker/u8:0+flush-8:011:56:261
2530749993325,6cyclictest2760926-21unixbench_multi10:56:260
2530757993217,3cyclictest2742213-21fschecks_time10:41:112
2530757993210,7cyclictest2716535-21cat10:15:002
2530753993227,3cyclictest2618240-21irqrtprio08:36:161
2530749993227,3cyclictest2623217-21irqrtprio08:41:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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