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2026-05-19 - 09:31

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 Tue May 19, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125627621390,4sleep20-21swapper/222:25:122
124130521310,3sleep33056-21PK-Backend21:40:183
124814121230,2sleep33056-21PK-Backend22:00:193
120503921160,3sleep053-21kcompactd019:56:580
128164621100,3sleep20-21swapper/223:35:182
118706627439,29sleep20-21swapper/219:09:332
118702727339,28sleep30-21swapper/319:09:023
118676226244,13sleep00-21swapper/019:05:370
118542226141,14sleep10-21swapper/119:05:021
12560592480,2sleep33056-21PK-Backend22:25:013
12446902420,3sleep3411rcuc/321:50:173
13036062410,3sleep10-21swapper/100:40:011
12229012380,2sleep00-21swapper/020:50:110
118723399343,13cyclictest0-21swapper/021:35:000
118723399343,13cyclictest0-21swapper/021:35:000
118723399319,9cyclictest1271797-21runrttasks23:08:090
118723399318,5cyclictest1214204-21/usr/sbin/munin20:25:200
118723399298,7cyclictest1209037-21wc20:10:120
118723399294,14cyclictest1302334-21df00:35:130
12686852280,2sleep20-21swapper/223:00:012
118723399286,8cyclictest1273364-21chrt23:11:020
118723399285,13cyclictest0-21swapper/021:10:520
118723399285,11cyclictest1251266-21df22:10:130
118723399285,10cyclictest1233678-21diskstats21:20:130
118723399284,8cyclictest1289310-21munin-run00:00:000
1187238992722,4cyclictest26-21ksoftirqd/100:30:001
118723399277,11cyclictest1297804-21chrt00:22:550
118723399274,13cyclictest0-21swapper/023:45:310
118723399273,15cyclictest0-21swapper/022:55:130
118723399273,14cyclictest0-21swapper/000:25:010
118723399272,6cyclictest0-21swapper/020:05:110
1187233992715,7cyclictest1187446-21apt19:10:120
118723399266,7cyclictest1213-21kerneloops23:52:430
118723399266,10cyclictest1191042-21chrt19:19:000
118723399265,8cyclictest1247837-21hddtemp_smartct22:00:160
118723399265,7cyclictest1220644-21sshd20:41:540
118723399265,12cyclictest0-21swapper/000:08:110
118723399264,14cyclictest0-21swapper/021:29:280
118723399263,7cyclictest1-21systemd20:40:000
118723399263,7cyclictest1-21systemd20:40:000
1187238992520,4cyclictest26-21ksoftirqd/120:55:001
118723399258,5cyclictest1221161-21acpi20:45:110
118723399258,5cyclictest1194418-21chrt19:27:340
118723399256,7cyclictest0-21swapper/022:48:240
118723399255,8cyclictest0-21swapper/019:40:040
118723399254,9cyclictest1280948-21cpu23:35:110
118723399254,8cyclictest1233035-21latency_hist21:20:010
118723399253,9cyclictest886-21NetworkManager19:50:000
118723399252,9cyclictest0-21swapper/022:35:130
118723399252,9cyclictest0-21swapper/022:35:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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