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2026-04-26 - 19:52

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 highest latencies:
System rack4slot6s.osadl.org (updated Sun Apr 26, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
224923110,2sleep02252-21processes11:55:260
71822650,2sleep0719-21latency_hist09:45:020
3216122600,3sleep032159-21fgrep11:45:260
107522440,3sleep01078-21switchtime11:50:260
24363213718,95sleep024403-21df07:05:140
2394421170,4chrt23868-21latency_hist11:15:030
2839121140,4sleep028461-21/usr/sbin/munin09:25:240
2707921140,2sleep027082-21wc07:15:180
1887321140,4chrt18874-21cpu10:55:100
2561621130,3sleep025466-21/usr/sbin/munin09:15:180
376021030,3sleep03768-21users12:00:300
41062890,3sleep04107-21users07:50:310
305832890,4sleep030614-21irqstats11:40:150
85622885,9sleep08606-21cat08:10:020
227642880,2sleep022766-21sh09:05:000
298652854,10sleep029932-21sendmail_mailqu07:25:270
25542996136,16cyclictest5981-21/usr/sbin/munin10:05:120
25542996110,19cyclictest950-21/usr/sbin/munin07:40:150
2554299609,18cyclictest31107-21ntp_states07:30:240
2554299608,19cyclictest12385-21/usr/sbin/munin10:30:200
2554299608,16cyclictest8679-21/usr/sbin/munin08:10:160
25542995935,15cyclictest19284-21/usr/sbin/munin08:50:210
25542995933,16cyclictest7615-21/usr/sbin/munin10:10:240
25542995933,15cyclictest24348-21/usr/sbin/munin11:15:260
25542995911,19cyclictest12496-21ntpq12:35:230
2554299589,15cyclictest5252-21seq10:00:290
2554299588,19cyclictest32096-21/usr/sbin/munin07:35:140
2554299588,17cyclictest16262-21/usr/sbin/munin10:45:250
25542995834,15cyclictest27404-21runrttasks11:27:090
25542995819,15cyclictest13999-21latency08:30:170
25542995811,19cyclictest5058-21ntpq07:55:200
25542995810,16cyclictest8533-21/usr/sbin/munin12:20:190
25542995810,16cyclictest14839-21munin-run10:40:000
25542995810,15cyclictest7218-21sshd12:15:180
2554299579,16cyclictest3627-21ntp_states09:55:220
2554299579,16cyclictest2734-21sort07:45:260
2554299578,17cyclictest11422-21/usr/sbin/munin08:20:150
2554299578,15cyclictest25644-21/usr/sbin/munin07:10:260
2554299578,14cyclictest286132chrt11:31:310
2554299577,17cyclictest16878-21/usr/sbin/munin08:40:260
25542995734,15cyclictest2241-21/usr/sbin/munin09:50:180
25542995733,15cyclictest11200-21/usr/sbin/munin10:25:160
25542995732,16cyclictest9372-21runrttasks10:17:390
25542995732,16cyclictest25567-21/usr/sbin/munin11:20:210
25542995732,15cyclictest863-21/usr/sbin/munin09:45:160
25542995731,15cyclictest20276-21/usr/sbin/munin11:00:160
25542995710,14cyclictest28249-21/usr/sbin/munin07:20:130
2554299569,16cyclictest10911-21/usr/sbin/munin12:30:270
2554299569,14cyclictest4512-21df12:05:130
2554299568,17cyclictest20289-21/usr/sbin/munin08:55:130
2554299568,15cyclictest10692-21sshd10:22:430
2554299567,16cyclictest29167-21/usr/sbin/munin11:35:250
25542995633,14cyclictest21516-21/usr/sbin/munin11:05:140
25542995631,16cyclictest31681-21runrttasks09:39:080
25542995631,16cyclictest15182-21/usr/sbin/munin08:35:120
25542995629,19cyclictest28048-21latency_hist09:25:020
25542995611,16cyclictest9964-21/usr/sbin/munin08:15:320
25542995610,16cyclictest29680-21chrt09:30:240
25542995610,14cyclictest6108-21cut12:10:270
2554299558,15cyclictest152712chrt10:40:220
2554299557,16cyclictest22890-21/usr/sbin/munin09:05:190
25542995531,16cyclictest13584-21runrttasks08:28:580
25542995520,12cyclictest24375-21missed_timers09:10:190
25542995511,16cyclictest18155-21seq10:50:320
25542995430,14cyclictest6314-21/usr/sbin/munin08:00:190
25542995429,16cyclictest10728-21runrttasks12:29:360
25542995428,18cyclictest18381-21runrttasks08:45:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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