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2026-03-07 - 13:12

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 Mar 06, 2026 12:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1893523100,7sleep341-21ksoftirqd/307:05:253
192472236162,24sleep20-21swapper/207:06:022
195542204167,25sleep10-21swapper/107:09:591
192352201164,25sleep00-21swapper/007:05:520
1990921760,5sleep01963899cyclictest12:00:250
2616921550,3sleep123-21ksoftirqd/112:15:191
312632770,3sleep30-21swapper/311:15:133
325922590,5sleep31965699cyclictest10:05:023
161022570,3sleep01963899cyclictest08:10:250
62572510,1sleep20-21swapper/209:05:012
1963899421,32cyclictest16394-21/usr/sbin/munin11:55:180
1963899412,29cyclictest32134-21/usr/sbin/munin08:50:180
1963899388,21cyclictest22162-21netstat08:25:200
1963899384,20cyclictest88150irq/126-enp1s0-11:00:020
1963899381,27cyclictest22779-21awk12:10:010
1963899380,27cyclictest26706-21unixbench_multi12:15:250
1963899372,20cyclictest11297-21unixbench_multi11:40:240
1963899371,22cyclictest3557-21/usr/sbin/munin07:45:230
1963899371,22cyclictest12482-21kworker/u8:209:25:210
19638993711,12cyclictest2384-21perf10:10:000
1963899367,21cyclictest23696-21sshd09:44:410
1963899361,31cyclictest2152-21pmu-power11:20:220
1963899361,26cyclictest26781-21/usr/sbin/munin11:05:230
1963899361,22cyclictest31769-21grep11:15:160
1963899361,21cyclictest27519-21sleep08:40:010
1963899361,21cyclictest27126-21/usr/sbin/munin07:25:240
1963899361,19cyclictest14913-21taskset09:24:460
1963899357,20cyclictest823-21snmpd10:37:300
1963899357,20cyclictest17976-21/usr/sbin/munin10:45:200
1963899351,26cyclictest25383-21latency_hist08:35:020
1963899351,25cyclictest24571-21/usr/sbin/munin11:00:260
1964399341,26cyclictest0-21swapper/110:14:291
1963899347,16cyclictest88150irq/126-enp1s0-11:35:160
1963899347,16cyclictest88150irq/126-enp1s0-11:35:160
1963899343,21cyclictest20405-21kernelversion09:35:170
1963899342,27cyclictest5856-21ntp_states10:15:200
1963899341,29cyclictest10148-21/usr/sbin/munin08:00:160
1963899341,25cyclictest30854-21swap12:25:250
1963899341,24cyclictest7949-21/usr/sbin/munin07:55:140
1963899341,20cyclictest27736-21/usr/sbin/munin08:40:230
1963899341,18cyclictest9192-21/usr/sbin/munin10:25:230
1963899341,16cyclictest21696-21tail10:50:290
1963899340,25cyclictest0-21swapper/010:40:150
1963899333,14cyclictest24707-21munin-run07:20:010
19638993316,13cyclictest11448-21tail09:15:170
1963899331,25cyclictest23958-21/usr/sbin/munin09:45:140
1963899331,24cyclictest7322-21chrt11:34:280
1963899331,24cyclictest4169-21/usr/sbin/munin09:00:180
1963899331,24cyclictest21953-21munin-node10:30:120
1963899331,24cyclictest21953-21munin-node10:30:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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