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2026-08-31 - 10:43

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 Mon Aug 31, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1202922550,2sleep012028-21wc19:50:260
2947322520,3sleep029471-21ls21:00:010
908422400,2sleep09085-21sort19:40:180
1547522180,2sleep015474-21grep22:10:220
2540221480,2sleep025399-21idleruntime-cro22:50:000
588021270,3chrt5856-21munin-run23:40:020
388221260,3chrt3877-21ntp_states21:25:240
1926021250,3chrt19261-21munin-node20:20:110
1809321250,4chrt18091-21ntp_states22:20:240
2560421230,3chrt25575-21latency_hist20:45:020
2566221130,3sleep025665-21irqstats22:50:170
1780221130,4sleep017817-21munin-run20:15:000
1164121040,4sleep011711-21ls00:00:300
156221020,4sleep01615-21mailstats19:10:270
21742980,3sleep02186-21cat23:25:150
91022810,3sleep09101-21wc21:45:250
3276328122,32sleep0369-21/usr/sbin/munin19:05:250
233092620,3sleep023310-21missed_timers20:35:170
1065996232,20cyclictest1211-21/usr/sbin/munin21:15:190
1065996134,16cyclictest10470-21/usr/sbin/munin21:50:260
1065996126,14cyclictest5812-21runrttasks21:33:150
1065996122,13cyclictest9706-21cron23:55:020
1065996034,16cyclictest4089-21/usr/sbin/munin19:20:270
106599597,17cyclictest19077-21/usr/sbin/munin22:25:280
1065995933,16cyclictest2559-21/usr/sbin/munin21:20:220
1065995932,16cyclictest13187-21/usr/sbin/munin19:55:270
1065995922,13cyclictest32578-21systemctl21:10:260
1065995919,14cyclictest32137-21latency23:15:190
1065995910,18cyclictest18471-21/usr/sbin/munin20:15:270
106599589,17cyclictest17718-21latency_hist22:20:010
106599588,16cyclictest29573-21/usr/sbin/munin21:00:280
106599586,17cyclictest3399-21/usr/sbin/munin23:30:140
1065995835,13cyclictest14504-21users22:05:300
1065995833,16cyclictest25842-21/usr/sbin/munin20:45:160
1065995833,16cyclictest15322-21/usr/sbin/munin00:15:250
1065995830,17cyclictest11571-21/usr/sbin/munin21:55:200
1065995820,11cyclictest8101-21cat19:35:270
1065995812,19cyclictest6153-21/usr/sbin/munin21:35:190
1065995811,18cyclictest31460-21users21:05:300
106599579,14cyclictest27276-21ntp_states20:50:240
106599578,17cyclictest13722-21/usr/sbin/munin00:10:200
106599578,16cyclictest16382-21df_inode00:20:140
106599578,16cyclictest10205-21/usr/sbin/munin19:45:270
106599576,17cyclictest31093-21grep23:10:240
1065995734,15cyclictest29453-21/usr/sbin/munin23:05:120
1065995733,16cyclictest21718-21/usr/sbin/munin22:35:150
1065995733,15cyclictest9480-21runrttasks23:53:080
1065995733,15cyclictest1303-21/usr/sbin/munin23:20:270
1065995729,15cyclictest18941-21df00:30:130
1065995711,17cyclictest28113-21/usr/sbin/munin23:00:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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