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2026-09-02 - 16:12

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Wed Sep 02, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
393622640,2sleep03935-21wc12:20:200
382022460,2sleep03821-21latency_hist10:15:000
663821320,4chrt6637-21/usr/sbin/munin10:25:180
1022221290,3chrt10223-21munin-plugin-st10:40:010
2112321240,4chrt21122-21ntp_kernel_pll_09:15:190
137821220,3chrt1352-21munin-run08:00:000
2972021160,3chrt29719-21sshd07:43:100
184721160,3chrt1846-21/usr/sbin/munin08:00:250
1350521150,3sleep013504-21wc10:50:290
575321030,4sleep05795-21users10:20:280
3015921010,3sleep030203-21/usr/sbin/munin07:45:160
1212721010,3sleep012173-21ps08:40:230
1445221000,4sleep014463-21/usr/sbin/munin08:50:140
5202990,3sleep0592-21timerwakeupswit10:00:260
302152980,3sleep030271-21processes09:50:250
50132916,10sleep05063-21df12:25:100
248512910,3sleep024852-21if_err_eth009:30:160
279792900,2sleep028054-21wc07:35:270
263722876,9sleep026434-21/usr/sbin/munin09:35:270
57542810,3sleep05751-21find08:15:260
275372774,61sleep01-21systemd11:45:240
185652766,58sleep018569-21ntp_states09:05:230
2088227120,29sleep020909-21munin-run07:10:010
136582680,2sleep013659-21/usr/sbin/munin08:45:270
2093099629,19cyclictest27335-21/usr/sbin/munin09:40:280
20930996110,26cyclictest10367-21grep10:40:110
2093099599,27cyclictest23495-21munin-run07:20:010
2093099597,17cyclictest11644-21/usr/sbin/munin10:45:280
20930995910,15cyclictest23637-21/usr/sbin/munin07:20:160
2093099588,17cyclictest20558-21ls11:20:010
2093099588,17cyclictest15676-21/usr/sbin/munin08:55:290
20930995833,15cyclictest30107-21/usr/sbin/munin11:55:250
20930995821,12cyclictest31432-21entropy07:50:150
20930995811,17cyclictest592-21seq12:06:410
20930995810,21cyclictest19260-21munin-run11:15:010
32482573,8sleep00-21swapper12:17:190
2093099578,16cyclictest1129-21/usr/sbin/munin12:10:140
20930995734,15cyclictest5231-21runrttasks08:15:010
20930995733,16cyclictest15328-21runrttasks10:59:430
20930995733,15cyclictest10646-21/usr/sbin/munin08:35:170
20930995732,15cyclictest23714-21/usr/sbin/munin09:25:200
20930995731,17cyclictest25904-21/usr/sbin/munin11:40:100
20930995731,16cyclictest3347-21/usr/sbin/munin08:05:280
20930995731,16cyclictest31611-21/usr/sbin/munin12:00:280
20930995718,15cyclictest84882chrt10:31:250
2093099569,15cyclictest8141-21memory08:25:190
2093099568,16cyclictest28703-21ntpq11:50:210
2093099568,16cyclictest21031-21/usr/sbin/munin07:10:160
2093099568,15cyclictest7579-21/usr/sbin/munin12:35:260
2093099568,15cyclictest20078-21sed09:10:270
2093099568,14cyclictest6300-21/usr/sbin/munin12:30:160
2093099567,16cyclictest24916-21/usr/sbin/munin07:25:190
20930995634,15cyclictest1871-21/usr/sbin/munin10:05:280
20930995631,15cyclictest3962-21/usr/sbin/munin10:15:150
20930995614,12cyclictest17502-21timerandwakeup09:00:280
20930995611,17cyclictest25722-21munin-run11:40:010
20930995611,16cyclictest31324-21irqstats09:55:180
20930995610,18cyclictest22452-21mailstats11:25:270
20930995610,16cyclictest10160-21sshd08:33:100
20930995610,15cyclictest28616-21/usr/sbin/munin09:45:200
2093099559,13cyclictest6813-21irqstats08:20:160
2093099556,15cyclictest16809-21/usr/sbin/munin11:05:140
20930995532,16cyclictest24103-21runrttasks11:32:230
20930995531,16cyclictest22319-21/usr/sbin/munin09:20:170
2093099548,15cyclictest15807-21ntp_states11:00:210
20930995429,16cyclictest26254-21runrttasks07:30:130
20930995410,14cyclictest20999-21ntp_states11:20:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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