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2026-07-15 - 12:41

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 Wed Jul 15, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
113752238163,24sleep30-21swapper/319:08:253
113672238164,24sleep20-21swapper/219:08:202
111652233163,57sleep00-21swapper/019:05:410
113402232165,22sleep10-21swapper/119:08:001
3064321260,4sleep01157399cyclictest22:15:270
11587998783,3cyclictest0-21swapper/219:15:062
170902560,3sleep339-21rcuc/319:20:133
119512560,2sleep20-21swapper/221:35:162
67192460,2sleep30-21swapper/320:10:143
1157399431,26cyclictest30051-21/usr/sbin/munin19:50:210
1158199422,20cyclictest17263-21munin-run20:35:011
11587993936,2cyclictest0-21swapper/222:17:172
1157399391,18cyclictest0-21swapper/000:00:210
1157399390,31cyclictest13809-21awk00:05:220
1157399388,22cyclictest3337-21/usr/sbin/munin22:30:180
1157399381,24cyclictest32647-21crond21:10:020
11581993712,3cyclictest669-21expr21:10:121
1157399371,23cyclictest31296-21/usr/sbin/munin22:20:190
224412360,1sleep10-21swapper/120:45:141
1157399362,25cyclictest1464-21diskstats22:25:140
1157399361,26cyclictest9929-21/usr/sbin/munin22:45:170
1157399361,25cyclictest19265-21sed00:20:020
1159199351,25cyclictest0-21swapper/323:32:303
1157399352,18cyclictest0-21swapper/023:30:130
1157399351,26cyclictest12264-21if_enp2s021:35:180
1157399351,21cyclictest10677-21basename20:20:000
1157399351,20cyclictest23459-21/usr/sbin/munin19:35:170
1157399351,19cyclictest13046-21memory22:50:190
1159199340,27cyclictest0-21swapper/320:15:263
1157399345,20cyclictest26275-21/usr/sbin/munin20:55:290
1157399341,24cyclictest32650-21diskmemload21:29:240
1157399341,24cyclictest23766-21/usr/sbin/munin00:30:140
1157399341,23cyclictest29597-21chrt19:47:140
1157399341,23cyclictest0-21swapper/021:00:560
1159199331,12cyclictest0-21swapper/320:29:043
1158199331,15cyclictest0-21swapper/119:14:371
1157399336,19cyclictest87550irq/128-enp1s0-23:35:120
1157399334,19cyclictest15754-21cat22:55:260
1157399334,19cyclictest15754-21cat22:55:260
1157399332,22cyclictest87550irq/128-enp1s0-22:40:180
1157399332,16cyclictest6268-21munin-run20:10:010
1157399331,23cyclictest16870-21/usr/sbin/munin19:20:250
1157399330,22cyclictest0-21swapper/021:10:160
1159199320,25cyclictest0-21swapper/322:14:133
1158199321,14cyclictest0-21swapper/122:26:091
1157399324,20cyclictest87550irq/128-enp1s0-23:45:010
1157399322,26cyclictest1633-40dnf19:57:200
1157399322,22cyclictest18737-21/usr/sbin/munin23:05:230
1157399321,22cyclictest16530-21/usr/sbin/munin23:00:190
1157399321,21cyclictest27524-21/usr/sbin/munin23:25:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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