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2026-01-02 - 13:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack2slot7s.osadl.org (updated Thu Jan 01, 2026 19:55:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1774799999081,5cyclictest2580617-21grep18:09:562
1774799999081,5cyclictest2580617-21grep18:09:562
1774799999080,7cyclictest1997681-21sh17:39:492
1774798997261,8cyclictest2082292-21execl17:49:591
1774798997261,8cyclictest2082292-21execl17:49:591
177479899643,18cyclictest1907438-21spawn17:34:551
1774798996137,21cyclictest2579790-21sort18:09:541
1774798996137,21cyclictest2579790-21sort18:09:541
1774799995948,8cyclictest2585550-21grep18:10:092
1774798995939,16cyclictest2617595-21grep18:11:241
1774797995852,4cyclictest2580537-21multi.sh18:09:560
1774797995852,4cyclictest2580537-21multi.sh18:09:560
1774798995648,5cyclictest2000225-21wc17:40:011
1774798995628,24cyclictest2029495-21sh17:41:231
1774797995646,7cyclictest151ktimers/018:29:520
1774799995446,5cyclictest2025214-21sh17:41:132
1774797995345,5cyclictest2085372-21fstime17:57:210
1774797995345,5cyclictest2085372-21fstime17:57:210
1774797995343,8cyclictest2083829-21fstime17:53:350
1774797995233,16cyclictest2087106-21Run18:01:050
1774799995145,3cyclictest0-21swapper/217:05:012
1774797995142,5cyclictest2626299-21sh18:11:440
1774798994940,6cyclictest2085446-21Run17:58:541
1774798994940,6cyclictest2085446-21Run17:58:541
1774798994824,21cyclictest2087339-21spawn18:02:501
1774798994638,5cyclictest1778979-21whetstone-doubl17:20:011
1774799994536,6cyclictest2082293-21execl17:49:532
1774799994536,6cyclictest2082293-21execl17:49:532
1774799994436,5cyclictest1779321-21timerandwakeup17:20:012
1774797994436,6cyclictest2082291-21execl17:50:000
1774797994436,6cyclictest2082291-21execl17:50:000
1774797994332,8cyclictest0-21swapper/018:40:010
1774799994232,5cyclictest2083800-21Run17:52:012
1774798994234,5cyclictest2664420-21sh18:35:011
1774797994238,2cyclictest0-21swapper/017:34:540
1774797994236,4cyclictest2000307-21grep17:40:010
1774797994231,8cyclictest2050424-21sh17:42:160
177479999410,35cyclictest1779850-21fstime17:24:522
1774799993929,7cyclictest2497232-21Run18:04:552
1774799993928,7cyclictest2085928-21Run17:59:462
1774799993928,7cyclictest2085928-21Run17:59:462
1774799993811,19cyclictest1165-21mta-sts-daemon18:39:502
1774798993830,5cyclictest2083734-21execl17:50:161
1774799993724,9cyclictest2660237-21users18:20:002
1774799993720,11cyclictest1168-21mta-sts-daemon18:29:532
1774798993730,4cyclictest2666050-21munin-plugin-st18:40:011
1774798993729,5cyclictest1-21systemd17:25:011
1774797993724,3cyclictest0-21swapper/017:30:020
1774799993626,7cyclictest1782499-21latency_hist17:30:012
1774797993623,11cyclictest2661617-21grep18:25:010
1774799993527,5cyclictest2664279-21systemctl18:34:582
1774798993527,5cyclictest2661610-21unixbench-2d18:25:011
1774797993519,9cyclictest564-21dbus-daemon18:20:020
1774799993325,5cyclictest1963646-21cron17:35:012
1774798993325,5cyclictest1774816-21/usr/sbin/munin17:05:011
1774799993122,6cyclictest1777764-21unixbench_singl17:14:562
1774798993120,8cyclictest1782675-21sed17:30:021
1774797993023,4cyclictest2664672-21unixbench_singl18:35:020
1774799992924,2cyclictest0-21swapper/218:25:012
1774799992717,7cyclictest1776312-21grep17:09:592
1774797992723,2cyclictest0-21swapper/017:20:010
177479899267,12cyclictest1168-21mta-sts-daemon18:19:501
1774798992617,6cyclictest674-21gdbus17:09:541
1774797992620,3cyclictest0-21swapper/017:24:420
1774797992613,9cyclictest564-21dbus-daemon17:15:010
1774798992517,5cyclictest1777882-21grep17:15:011
1774797992519,4cyclictest461204-21cups-browsed17:09:230
1774798992417,4cyclictest0-21swapper/118:29:511
1774797992210,3cyclictest171rcu_preempt17:05:020
177480199192,10cyclictest0-21swapper/317:49:583
177480199192,10cyclictest0-21swapper/317:49:583
177480199173,8cyclictest0-21swapper/318:04:263
177480199164,7cyclictest0-21swapper/318:09:533
177480199164,7cyclictest0-21swapper/318:09:533
177480199161,6cyclictest0-21swapper/317:24:503
177480199152,8cyclictest0-21swapper/317:55:593
177480199152,8cyclictest0-21swapper/317:55:593
177480199152,8cyclictest0-21swapper/317:55:013
177480199143,6cyclictest0-21swapper/317:34:513
177480199142,6cyclictest0-21swapper/318:20:013
177480199141,8cyclictest0-21swapper/317:39:513
177480199132,7cyclictest0-21swapper/318:10:113
177480199131,6cyclictest0-21swapper/318:39:533
177480199123,6cyclictest0-21swapper/317:27:243
177480199122,7cyclictest0-21swapper/317:40:283
177480199122,7cyclictest0-21swapper/317:10:013
177480199120,6cyclictest0-21swapper/317:19:513
177480199112,6cyclictest0-21swapper/318:25:013
177480199111,7cyclictest0-21swapper/318:34:513
177480199101,6cyclictest0-21swapper/318:29:493
177480199101,6cyclictest0-21swapper/317:14:393
177480199101,5cyclictest0-21swapper/317:05:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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