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2026-05-12 - 02:36

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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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 Tue May 12, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
146142231162,56sleep00-21swapper/019:09:250
146142231162,56sleep00-21swapper/019:09:240
146592204167,25sleep10-21swapper/119:09:571
146592204167,25sleep10-21swapper/119:09:571
146492201165,24sleep30-21swapper/319:09:513
146492201165,24sleep30-21swapper/319:09:513
143972201164,24sleep20-21swapper/219:06:362
143972201164,24sleep20-21swapper/219:06:362
14755999692,3cyclictest0-21swapper/222:48:432
289182950,4sleep31476099cyclictest00:35:013
14755999491,2cyclictest0-21swapper/221:56:242
14755997673,2cyclictest0-21swapper/222:24:152
14755997470,3cyclictest0-21swapper/200:13:442
170582540,1sleep30-21swapper/300:05:233
273262510,1sleep00-21swapper/023:15:190
209222500,2sleep320921-21sort19:20:183
143022480,4sleep339-21rcuc/320:20:133
1475199461,37cyclictest16984-21awk00:05:211
1475199440,36cyclictest25894-21runrttasks23:12:591
1475199431,34cyclictest11065-21cat21:25:181
1475199431,34cyclictest11065-21cat21:25:181
1475199421,19cyclictest21001-21switchtime23:00:251
1475199411,28cyclictest7873-21basename21:20:011
14755993925,8cyclictest0-21swapper/222:12:412
1475199399,18cyclictest28695-21date19:40:011
1475199392,25cyclictest425-21/usr/sbin/munin23:30:121
1475199391,29cyclictest29443-21/usr/sbin/munin20:55:171
1475199391,27cyclictest28193-21smartctl00:30:261
1475199391,20cyclictest13325-21chrt23:58:101
1475199389,16cyclictest14190-21grep20:20:121
1475199381,29cyclictest32017-21taskset22:14:471
1475199381,28cyclictest28485-21/usr/sbin/munin23:20:131
1475199381,26cyclictest31645-21/usr/sbin/munin21:00:251
1475199381,24cyclictest16262-21/usr/sbin/munin20:25:181
1475199374,28cyclictest10015-40dnf21:24:401
1475199371,33cyclictest20774-21grep20:35:121
1475199371,32cyclictest808-21snmpd23:26:451
1475199371,32cyclictest1891-21sa119:50:201
1475199371,26cyclictest0-21swapper/122:05:121
1475199371,25cyclictest26290-21/usr/sbin/munin23:15:141
14743993711,12cyclictest30811-21awk19:45:020
1475199362,25cyclictest20336-21/usr/sbin/munin00:15:151
1475199361,32cyclictest26585-21memory22:00:201
1475199361,25cyclictest27246-21/usr/sbin/munin20:50:241
1475199361,23cyclictest18495-21grep19:15:151
1475199361,22cyclictest12840-21chrt21:30:141
1475199351,26cyclictest25147-21/usr/sbin/munin00:25:171
1475199351,22cyclictest808-21snmpd20:16:301
1475199351,22cyclictest808-21snmpd20:16:301
1475199351,20cyclictest10529-21/usr/sbin/munin23:50:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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