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2026-07-04 - 11:14

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 Sat Jul 04, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2005022640,2sleep020053-21cron20:39:590
1149322630,2sleep011491-21cat22:10:270
595222310,3sleep05953-21latency_hist19:45:010
2973322240,2sleep029732-21sort21:15:270
2449621290,3chrt24495-21/usr/sbin/munin23:00:250
1465621280,2sleep014654-21grep00:30:020
3185521260,3chrt31854-21ls23:30:180
868621140,4sleep08708-21irqstats19:55:150
1678421140,4chrt16785-21systemctl20:25:260
47512940,3sleep04811-21grep23:50:260
74282900,3sleep07455-21latency19:50:160
102722880,3sleep010270-21timerwakeupswit22:05:260
114632836,9sleep011461-21ntp_states20:05:230
2851527821,33sleep028584-21/usr/sbin/munin19:05:230
129892690,2sleep012991-21timerandwakeup20:10:270
139842680,2sleep013987-21cut22:20:250
2931899667,29cyclictest24063-21/usr/sbin/munin20:55:300
2931899627,16cyclictest3923-21/usr/sbin/munin19:35:260
29318996230,21cyclictest20612-21/usr/sbin/munin20:40:260
2931899618,13cyclictest32211-21memory19:20:180
68132600,2sleep06815-21sendmail00:00:000
2931899608,16cyclictest16672-21/usr/sbin/munin22:30:260
29318996037,13cyclictest982-21/usr/sbin/munin21:30:230
29318996034,16cyclictest9592-21/usr/sbin/munin00:10:130
2931899598,17cyclictest6946-21/usr/sbin/munin00:00:130
29318995935,16cyclictest7915-21runrttasks21:57:100
2931899589,18cyclictest26742-21ntpq23:10:190
29318995833,15cyclictest15122-21/usr/sbin/munin00:30:230
29318995832,15cyclictest2220-21/usr/sbin/munin21:35:220
29318995831,17cyclictest3661-21/usr/sbin/munin23:45:270
2931899579,19cyclictest742-21ntpq23:35:190
2931899579,17cyclictest22595-21/usr/sbin/munin22:55:260
2931899578,17cyclictest8694-21ntpq22:00:200
2931899578,17cyclictest3261-21/usr/sbin/munin21:40:250
2931899578,17cyclictest29087-21grep23:20:110
2931899578,17cyclictest21755-21/usr/sbin/munin20:45:190
2931899578,16cyclictest21645-21/usr/sbin/munin22:50:240
2931899577,17cyclictest15967-21/usr/sbin/munin00:35:300
2931899577,17cyclictest14874-21/usr/sbin/munin22:25:180
29318995733,15cyclictest29495-21/usr/sbin/munin19:10:150
29318995733,15cyclictest1357-21/usr/sbin/munin19:25:260
29318995732,15cyclictest28052-21runrttasks23:15:210
29318995732,15cyclictest18136-21/usr/sbin/munin20:30:270
29318995731,16cyclictest30750-21/usr/sbin/munin21:20:170
29318995731,16cyclictest12553-21/usr/sbin/munin22:15:170
29318995731,16cyclictest12369-21/usr/sbin/munin00:20:170
29318995731,16cyclictest10066-21/usr/sbin/munin20:00:170
2931899569,15cyclictest22781-21/usr/sbin/munin20:50:250
2931899569,15cyclictest11984-21munin-run00:20:010
2931899568,16cyclictest4587-21grep21:45:100
2931899565,27cyclictest5825-21seq21:50:100
29318995632,15cyclictest8318-21/usr/sbin/munin00:05:150
29318995630,16cyclictest25489-21ntp_states23:05:220
29318995616,13cyclictest17580-21awk22:35:150
29318995610,16cyclictest314882chrt23:29:430
2931899558,15cyclictest2126-21/usr/sbin/munin19:30:260
2931899557,17cyclictest25372-21/usr/sbin/munin21:00:150
29318995532,15cyclictest28905-21runrttasks21:13:210
29318995530,16cyclictest32472-21runrttasks21:25:400
29318995530,16cyclictest27408-21runrttasks21:06:380
29318995530,15cyclictest13814-21/usr/sbin/munin20:15:140
29318995528,17cyclictest6515-21/usr/sbin/munin19:45:270
2931899547,14cyclictest30701-21/usr/sbin/munin19:15:230
29318995432,14cyclictest2910-21runrttasks23:44:470
29318995431,15cyclictest15905-21runrttasks20:22:300
29318995419,24cyclictest20033-21munin-node22:45:100
29318995329,15cyclictest18745-21runrttasks22:40:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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