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2026-06-06 - 05:11

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 Jun 06, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1834522670,2sleep018344-21sort22:40:270
625122420,2sleep06249-21grep00:00:180
2697621190,4chrt26977-21sed21:10:020
1427021180,2sleep014268-21swap00:30:260
2208121150,3chrt22082-21missed_timers20:50:180
1662021150,3chrt16621-21latency_hist20:30:020
781021000,4sleep07811-21ntp_states22:00:230
42802980,4sleep04341-21ls19:40:260
56432960,3sleep05640-21cat19:45:280
77222855,11sleep07726-21df_inode19:55:120
23802780,3sleep02417-21latency_hist19:35:010
2730327018,30sleep027359-21irqstats19:05:160
28416996432,23cyclictest31222-21/usr/sbin/munin21:25:200
28416996424,14cyclictest29811-21cpu19:15:110
2841699629,15cyclictest25869-21ntp_states23:10:210
28416996127,25cyclictest7531-21/usr/sbin/munin00:05:170
2841699608,17cyclictest23164-21/usr/sbin/munin20:55:290
28416996010,18cyclictest28818-21ntpq19:10:220
2841699599,17cyclictest2772-21awk19:35:190
2841699599,14cyclictest14296-21irqstats20:20:160
28416995935,15cyclictest19438-21/usr/sbin/munin22:45:230
28416995910,17cyclictest20984-21/usr/sbin/munin22:50:280
2841699589,17cyclictest15262-21/usr/sbin/munin22:30:160
2841699589,16cyclictest17717-21munin-run22:40:010
2841699588,17cyclictest8811-21/usr/sbin/munin22:05:160
2841699588,15cyclictest1079-21memory23:40:160
2841699588,14cyclictest189692sleep020:38:290
28416995835,15cyclictest32493-21/usr/sbin/munin21:30:200
28416995833,16cyclictest454-21/usr/sbin/munin19:25:280
28416995833,16cyclictest13120-21runrttasks20:15:200
28416995832,17cyclictest20654-21/usr/sbin/munin20:45:120
2841699579,15cyclictest12695-21/usr/sbin/munin22:20:130
2841699578,17cyclictest8980-21/usr/sbin/munin20:00:250
2841699578,17cyclictest11306-21grep22:15:010
2841699577,17cyclictest5134-21/usr/sbin/munin23:55:250
28416995733,16cyclictest3653-21/usr/sbin/munin23:50:180
28416995733,16cyclictest11896-21/usr/sbin/munin20:10:250
28416995719,14cyclictest24906-21runrttasks21:00:250
28416995712,19cyclictest27060-21memory23:15:190
28416995712,19cyclictest11517-21ntp_states00:20:220
28416995710,16cyclictest13977-21/usr/sbin/munin22:25:170
2841699569,16cyclictest32231-21memory23:35:170
2841699568,15cyclictest28337-21/usr/sbin/munin21:15:180
2841699568,15cyclictest16973-21ntpq20:30:180
2841699567,18cyclictest6385-21/usr/sbin/munin19:50:210
2841699567,18cyclictest12510-21/usr/sbin/munin00:25:250
2841699567,17cyclictest4926-21/usr/sbin/munin21:50:150
2841699567,17cyclictest15076-21/usr/sbin/munin00:35:160
28416995633,15cyclictest8769-21irqstats00:10:160
28416995633,15cyclictest2672-21/usr/sbin/munin23:45:260
28416995633,15cyclictest19439-21/usr/sbin/munin20:40:140
28416995633,14cyclictest29887-21/usr/sbin/munin23:25:250
28416995632,16cyclictest3785-21/usr/sbin/munin21:45:170
28416995630,16cyclictest29807-21runrttasks21:20:170
28416995621,13cyclictest6423-21missed_timers21:55:180
28416995610,16cyclictest11440-21df_inode22:15:150
2841699559,17cyclictest27104-21df21:10:110
2841699559,14cyclictest23009-21/usr/sbin/munin23:00:100
2841699559,12cyclictest28238-21/usr/sbin/munin23:20:120
2841699558,15cyclictest10421-21/usr/sbin/munin00:15:270
2841699557,15cyclictest112242chrt20:08:230
28416995531,17cyclictest21991-21ntp_states22:55:210
28416995530,15cyclictest24644-21/usr/sbin/munin23:05:230
28416995529,17cyclictest3530-21runrttasks21:45:010
2841699548,15cyclictest30762-21/usr/sbin/munin23:30:270
2841699548,14cyclictest1051-21egrep21:35:090
28416995430,15cyclictest31176-21df19:20:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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