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2025-12-04 - 12:16

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 Thu Dec 04, 2025 00:44:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1623991080,77rtkit-daemon0-21swapper/219:07:192
5904472850,7sleep3590448-21latency_hist22:20:003
52293827439,28sleep00-21swapper/019:07:100
52283927456,13sleep30-21swapper/319:05:583
52281726844,15sleep10-21swapper/119:05:381
52330299639,16cyclictest1753-21gnome-shell20:35:151
52330299624,39cyclictest612609-21diskstats23:20:181
162399620,9rtkit-daemon1622-21rtkit-daemon23:40:010
523302996012,16cyclictest1753-21gnome-shell20:45:031
52330299587,28cyclictest539742-21latency_hist19:55:021
162399580,8rtkit-daemon1622-21rtkit-daemon23:50:580
6159092570,9chrt615914-21cpuspeed_turbos23:30:130
523304995726,10cyclictest34-21ksoftirqd/223:25:282
52330299576,26cyclictest629714-21munin-run00:10:001
523302995714,17cyclictest619695-21irqstats23:40:231
162399570,8rtkit-daemon1622-21rtkit-daemon23:53:131
523304995620,20cyclictest34-21ksoftirqd/200:00:002
52330299565,31cyclictest634767-21cat00:20:311
52330299565,31cyclictest614340-21diskstats23:25:161
52330299565,27cyclictest596975-21timerwakeupswit22:35:311
52330299564,31cyclictest540718-21sed19:55:311
523302995611,20cyclictest610854-40lsb_release23:15:191
523304995534,5cyclictest141rcu_preempt19:25:232
52330299557,25cyclictest1753-21gnome-shell22:00:021
52330299555,15cyclictest1753-21gnome-shell20:08:421
523302995512,23cyclictest1753-21gnome-shell20:01:551
523302995512,23cyclictest1753-21gnome-shell20:01:551
523302995511,24cyclictest560083-21memory20:50:231
162399550,8rtkit-daemon1622-21rtkit-daemon23:46:531
52330299549,17cyclictest625820-21seq23:56:131
52330299547,11cyclictest1753-21gnome-shell21:00:221
52330299547,11cyclictest1753-21gnome-shell21:00:211
523302995413,22cyclictest630183-21cnf-update-db00:10:031
523302995412,22cyclictest1753-21gnome-shell22:03:351
523302995411,17cyclictest639400-21cat00:35:231
52330299538,17cyclictest1753-21gnome-shell22:45:031
52330299536,14cyclictest592840-21hddtemp_smartct22:25:191
523302995324,25cyclictest626473-21cups-browsed00:00:051
523302995312,16cyclictest577922-21taskset21:40:311
162399530,8rtkit-daemon1622-21rtkit-daemon23:42:150
52330999529,6cyclictest141rcu_preempt23:56:403
523304995229,19cyclictest619296-21/usr/sbin/munin23:40:152
523304995220,18cyclictest34-21ksoftirqd/223:35:012
52330299526,18cyclictest587162-21latency_hist22:10:021
52330299526,15cyclictest527424-21wc19:20:021
52330299526,15cyclictest527424-21wc19:20:021
52330299525,28cyclictest573421-21/usr/sbin/munin21:30:141
52330299523,20cyclictest562245-21sed20:55:311
162399520,45rtkit-daemon3242254-21gmain20:59:400
5841782510,6sleep22197014-21PK-Backend22:00:182
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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