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2026-04-17 - 23:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot6s.osadl.org (updated Fri Apr 17, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2428621670,3sleep024350-21sendmail_mailst11:35:260
604421510,3sleep06040-21ps12:30:260
1326921490,4sleep013270-21sshd08:47:190
2962821360,2sleep029629-21/usr/sbin/munin11:55:270
3257421320,3chrt32572-21users07:55:310
1400921240,4chrt14007-21ntp_states08:50:190
1032221200,3sleep010323-21grep10:40:280
761921120,3chrt7617-21proc_pri08:25:250
357121100,2sleep03572-21wc08:10:170
587021050,3sleep05871-21munin-node10:25:090
194621040,4sleep01987-21memory12:15:160
2676921000,3sleep026768-21wc07:35:020
246042900,3sleep024668-21mailstats07:25:260
56582846,66sleep0114-21systemd-journal10:24:210
1924827922,33sleep019256-21memory07:05:170
322632734,57sleep032288-21users12:05:280
20271996812,19cyclictest2238-21ntpq10:10:190
20271996524,14cyclictest18975-21missed_timers11:15:180
86272620,4sleep08626-21missed_timers10:35:150
20271996135,15cyclictest30881-21/usr/sbin/munin12:00:250
20271996133,18cyclictest0-21swapper11:25:120
20271996124,14cyclictest18207-21/usr/sbin/munin09:05:290
2027199608,19cyclictest8822-21grep08:30:200
2027199608,17cyclictest4683-21/usr/sbin/munin08:15:120
20271996035,15cyclictest11307-21/usr/sbin/munin10:45:180
20271996033,18cyclictest21148-21runrttasks09:18:190
20271996021,14cyclictest19091-21cut09:10:180
20271996011,19cyclictest28139-21irqstats09:45:160
2027199599,16cyclictest7206-21df10:30:120
2027199599,15cyclictest27812-21/usr/sbin/munin11:50:310
20271995931,18cyclictest3378-21/usr/sbin/munin12:20:190
20271995914,14cyclictest276-21runrttasks09:35:280
20271995912,16cyclictest29407-21/usr/sbin/munin07:45:290
2027199589,16cyclictest28179-21/usr/sbin/munin07:40:120
2027199589,15cyclictest13596-21/usr/sbin/munin10:55:180
2027199589,14cyclictest11162-21/usr/sbin/munin08:40:160
20271995834,15cyclictest20448-21/usr/sbin/munin07:10:140
20271995833,16cyclictest15094-21/usr/sbin/munin08:55:150
20271995810,19cyclictest30834-21ntpq09:55:230
20271995810,16cyclictest15193-21ntp_states11:00:200
20271995810,15cyclictest16505-21/usr/sbin/munin09:00:170
2027199579,16cyclictest4443-21idleruntime-cro10:20:010
2027199579,15cyclictest6066-21/usr/sbin/munin08:20:130
2027199578,17cyclictest9853-21/usr/sbin/munin08:35:310
2027199577,18cyclictest1431-21seq08:00:280
20271995733,15cyclictest22044-21/usr/sbin/munin07:15:250
20271995732,15cyclictest4614-21/usr/sbin/munin12:25:190
20271995730,16cyclictest1239-21runrttasks12:11:260
20271995710,18cyclictest17359-21latency_hist11:10:020
2027199569,17cyclictest22949-21ntpq11:30:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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