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2025-12-29 - 21:30

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 Mon Dec 29, 2025 12:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125658922570,11sleep10-21swapper/107:05:061
197399950,8rtkit-daemon1972-21rtkit-daemon12:18:541
197399900,10rtkit-daemon4497-21PK-Backend08:54:331
197399800,66rtkit-daemon0-21swapper/307:07:593
125790927644,22sleep00-21swapper/007:07:560
13105512750,4sleep21310552-21cat09:35:302
13105512750,4sleep21310552-21cat09:35:302
197399720,4rtkit-daemon4497-21PK-Backend12:10:021
125789826748,13sleep20-21swapper/207:07:502
197399630,9rtkit-daemon1972-21rtkit-daemon12:15:130
1258239995916,18cyclictest1361187-21taskset11:58:043
1258239995716,15cyclictest1269072-21taskset07:39:403
1258239995716,15cyclictest1269072-21taskset07:39:403
197399560,9rtkit-daemon1972-21rtkit-daemon07:54:290
1258239995618,16cyclictest1279259-21taskset08:07:103
1258239995615,14cyclictest0-21swapper/312:03:003
197399550,8rtkit-daemon1972-21rtkit-daemon09:01:140
197399550,8rtkit-daemon1972-21rtkit-daemon08:21:160
197399550,8rtkit-daemon1972-21rtkit-daemon08:02:260
197399550,8rtkit-daemon1972-21rtkit-daemon08:02:250
13298752550,4sleep00-21swapper/010:30:220
1258239995514,15cyclictest0-21swapper/310:18:453
1258239995513,18cyclictest1354142-21cut11:40:023
1258239995417,15cyclictest1354875-21ls11:40:243
1258239995414,13cyclictest0-21swapper/312:29:403
1258239995411,21cyclictest1054-21snmpd12:18:313
197399530,8rtkit-daemon1972-21rtkit-daemon08:28:380
1258239995311,19cyclictest1316401-21runrttasks09:53:453
125822899537,12cyclictest1321167-21needreboot10:05:210
1258239995213,16cyclictest1280789-21expr08:10:313
1258239995213,16cyclictest1265609-21awk07:30:003
1258239995212,15cyclictest0-21swapper/308:47:543
125822899524,23cyclictest438-20systemd-journal12:32:090
197399510,8rtkit-daemon1972-21rtkit-daemon08:25:401
1258239995113,16cyclictest1033-21gdbus12:32:423
1258239995112,17cyclictest1314501-21awk09:50:003
1258239995112,11cyclictest438-20systemd-journal07:46:323
1258239995110,15cyclictest1320325-21latency_hist10:05:023
1258239995013,15cyclictest1330343-21python310:30:303
1258239994938,7cyclictest924-21NetworkManager11:02:053
1258239994920,24cyclictest1365825-21ntp_states12:10:253
1258239994912,13cyclictest1348384-21find11:25:013
1258239994817,12cyclictest1349977-31apt-check11:25:533
125822899489,15cyclictest1353379-21sort11:35:300
197399470,31rtkit-daemon1355414-21cat11:40:332
1258239994713,13cyclictest1137-21runrttasks07:31:003
1258239994712,13cyclictest0-21swapper/312:24:523
1258239994711,15cyclictest0-21swapper/310:37:353
1258235994721,22cyclictest1265580-21cron07:30:002
125822899479,15cyclictest1325689-21sed10:20:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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