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2025-12-26 - 08:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Fri Dec 26, 2025 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
263442236164,23sleep30-21swapper/319:06:473
263442236164,23sleep30-21swapper/319:06:463
265542203166,24sleep10-21swapper/119:09:301
265542203166,24sleep10-21swapper/119:09:301
263512203166,25sleep00-21swapper/019:06:520
263512203166,25sleep00-21swapper/019:06:520
246362201165,24sleep20-21swapper/219:05:092
246362201165,24sleep20-21swapper/219:05:092
1086221690,4sleep02667299cyclictest19:45:120
26686991170,111cyclictest0-21swapper/221:26:402
26686991170,111cyclictest0-21swapper/221:26:402
26686999895,2cyclictest0-21swapper/222:11:192
26686996259,2cyclictest0-21swapper/200:12:402
101672560,5sleep230-21rcuc/220:55:242
76452550,2sleep20-21swapper/200:30:232
284372510,1sleep30-21swapper/300:05:203
257392470,4sleep025742-21idleruntime22:45:190
234312470,1sleep00-21swapper/023:55:020
2667299451,26cyclictest10217-21grep22:10:160
2667299421,27cyclictest28851-21latency_hist19:15:010
2667299400,29cyclictest2317-21grep21:50:260
2667299391,24cyclictest13423-21/usr/sbin/munin21:05:260
2667299391,23cyclictest2428-21/usr/sbin/munin20:40:210
2667299381,23cyclictest26922-21expr21:35:130
2667299381,22cyclictest24193-21munin-run21:30:010
2667299381,22cyclictest24193-21munin-run21:30:010
2667299371,26cyclictest11910-21egrep22:15:120
2667299371,24cyclictest27235-21/usr/sbin/munin22:50:260
2667299361,26cyclictest31633-21acpi23:00:140
2667299361,26cyclictest12794-21/usr/sbin/munin19:50:200
2667299361,22cyclictest31056-21cpu21:45:130
224702360,4sleep30-21swapper/321:25:153
224702360,4sleep30-21swapper/321:25:153
2667299356,14cyclictest31748-21munin-run19:20:010
2667299351,31cyclictest7455-21/usr/sbin/munin22:05:170
2667299351,31cyclictest10270-21/usr/sbin/munin23:25:170
2667299351,26cyclictest29434-21/usr/sbin/munin22:55:190
2667299351,24cyclictest17057-21expr23:40:130
2667299351,21cyclictest19340-21cstates23:45:140
2667299341,29cyclictest23796-21/usr/sbin/munin20:15:240
2667299341,24cyclictest22831-21/usr/sbin/munin22:40:170
2667299341,24cyclictest22831-21/usr/sbin/munin22:40:160
2667299340,26cyclictest0-21swapper/020:55:170
2667299335,17cyclictest6528-21switchtime22:00:260
2667299332,19cyclictest26644-21grep00:00:190
2667299332,18cyclictest907-21systemd-logind00:35:390
2667299331,29cyclictest27883-21/usr/sbin/munin00:05:230
2667299331,25cyclictest16608-21chrt23:39:490
2667299331,24cyclictest14407-21fschecks_count22:20:150
2667299331,18cyclictest0-21swapper/000:32:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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