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2025-10-30 - 13:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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.
Unexpectedly long latencies may be caused by SMIs
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 50 highest latencies:
System rackcslot7s.osadl.org (updated Thu Oct 30, 2025 00:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
151606422750,8sleep30-21swapper/319:05:283
1623991040,9rtkit-daemon1622-21rtkit-daemon21:00:092
16304612980,5sleep00-21swapper/000:30:170
15885602930,8sleep21753-21gnome-shell22:30:242
16066532920,13sleep013-21ksoftirqd/023:25:000
16090442910,8sleep02197014-21PK-Backend23:30:200
16238792820,7sleep21516787-21cyclictest00:10:262
162399790,26rtkit-daemon881143-21gmain19:46:163
15461042790,6sleep22197014-21PK-Backend20:30:312
151647527738,14sleep00-21swapper/019:07:390
16257462750,4chrt1624857-21/usr/sbin/munin00:15:281
162399740,5rtkit-daemon2197014-21PK-Backend22:26:410
151646527339,9sleep20-21swapper/219:07:322
151518627146,15sleep10-21swapper/119:05:151
162399700,8rtkit-daemon1622-21rtkit-daemon19:59:292
162399670,9rtkit-daemon1622-21rtkit-daemon00:35:422
162399650,8rtkit-daemon1622-21rtkit-daemon19:44:272
162399610,9rtkit-daemon1622-21rtkit-daemon20:57:343
162399600,9rtkit-daemon1622-21rtkit-daemon19:53:433
162399600,9rtkit-daemon1622-21rtkit-daemon19:53:423
162399590,9rtkit-daemon1622-21rtkit-daemon00:33:353
162399590,10rtkit-daemon1622-21rtkit-daemon20:35:583
162399580,9rtkit-daemon1622-21rtkit-daemon22:54:023
162399580,9rtkit-daemon1622-21rtkit-daemon22:05:493
162399580,9rtkit-daemon1622-21rtkit-daemon21:22:543
162399580,9rtkit-daemon1622-21rtkit-daemon21:18:553
162399580,9rtkit-daemon1622-21rtkit-daemon21:08:403
162399580,9rtkit-daemon1622-21rtkit-daemon20:23:013
162399580,9rtkit-daemon1622-21rtkit-daemon20:16:063
162399580,9rtkit-daemon1622-21rtkit-daemon19:33:513
162399580,9rtkit-daemon1622-21rtkit-daemon19:33:513
162399570,9rtkit-daemon1622-21rtkit-daemon20:25:483
162399570,8rtkit-daemon1622-21rtkit-daemon21:13:593
162399560,8rtkit-daemon1622-21rtkit-daemon22:04:573
15502442520,5sleep2331rcuc/220:42:252
162399510,42rtkit-daemon1506-21systemd22:46:042
162399510,42rtkit-daemon1506-21systemd22:46:042
1516803995128,19cyclictest1753-21gnome-shell00:05:513
162399500,27rtkit-daemon1569905-21kworker/1:021:55:091
16200142500,14sleep0161rcuc/000:00:220
1516803995034,5cyclictest42-21ksoftirqd/323:41:403
1516803994918,15cyclictest855-21dbus-daemon20:00:013
15407872480,14sleep0131ksoftirqd/020:15:270
162399470,39rtkit-daemon2197014-21PK-Backend19:42:033
1516802994713,12cyclictest141rcu_preempt00:15:312
151679799475,4cyclictest0-21swapper/122:28:091
1516793994732,11cyclictest1611929-21systemd23:40:010
1516803994628,13cyclictest1626354-21sh00:20:003
151680299466,5cyclictest141rcu_preempt23:15:002
1516797994629,12cyclictest1632193-21python300:35:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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