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2026-08-29 - 02:24

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 Sat Aug 29, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2548122610,2sleep025479-21ls20:10:020
1628522470,3sleep016288-21latency_hist21:40:020
1995921200,5chrt19960-21latency_hist00:00:020
1602221120,2sleep016025-21sh23:45:000
1738921110,2sleep017384-21latency_hist23:50:020
2584821060,4sleep025350-21/usr/sbin/munin22:15:280
127792880,3sleep012780-21/usr/sbin/munin19:20:160
217942860,2sleep021793-21latency19:55:160
102882830,4sleep010335-21ntp_kernel_pll_19:10:310
9936997545,18cyclictest28417-21ntp_states20:20:220
9936997338,24cyclictest13543-21runrttasks23:35:060
881827319,31sleep08874-21irqstats19:05:140
9936997247,15cyclictest18701-21runrttasks19:42:580
9936997042,16cyclictest14142-21ps21:30:260
9936996939,21cyclictest7665-21/usr/sbin/munin23:10:280
9936996842,16cyclictest17806-21memory21:45:180
9936996841,15cyclictest27680-21chrt22:23:500
9936996841,14cyclictest20131-21df_inode00:00:140
9936996838,19cyclictest26282-21chrt00:24:060
9936996741,14cyclictest19753-21chrt19:46:010
9936996740,16cyclictest32122-21ntp_states22:40:220
9936996739,16cyclictest3834-21/usr/sbin/munin20:50:250
9936996738,18cyclictest22012-21/usr/sbin/munin22:00:260
9936996643,13cyclictest15758-21timerwakeupswit19:30:300
9936996541,13cyclictest23074-21ntp_states22:05:220
9936996538,16cyclictest30315-21sort00:40:020
9936996438,15cyclictest4923-21ps23:00:260
9936996435,17cyclictest276-21runrttasks22:45:170
9936996340,14cyclictest3039-21runrttasks20:48:090
9936996339,15cyclictest9341-21runrttasks21:11:500
9936996338,14cyclictest29415-21/usr/sbin/munin20:25:220
9936996338,14cyclictest13648-21cat21:30:010
9936996337,15cyclictest11505-21memory19:15:180
9936996337,14cyclictest20375-21memory21:55:180
9936996337,14cyclictest17456-21chrt21:44:460
9936996333,17cyclictest27119-21users00:25:300
9936996323,15cyclictest13334-21sshd23:34:170
9936996239,15cyclictest20967-21vmstat19:50:300
9936996239,14cyclictest16484-21/usr/sbin/munin19:35:140
9936996239,13cyclictest22571-21wc00:10:010
9936996238,15cyclictest28969-21seq22:28:540
9936996234,16cyclictest25718-21memory20:10:180
9936996230,18cyclictest11427-21grep23:25:260
9936996228,21cyclictest22955-21/usr/sbin/munin20:00:250
9936996141,12cyclictest682-21idleruntime-cro20:40:010
9936996139,13cyclictest8529-21latency23:15:170
9936996139,13cyclictest11883-21sshd21:21:180
9936996137,14cyclictest5963-21irqstats23:05:180
9936996135,15cyclictest1300-21/usr/sbin/munin20:40:410
9936996134,15cyclictest4884-21wc20:55:220
9936996134,15cyclictest19094-21memory21:50:180
9936996133,16cyclictest30260-21runrttasks22:33:580
9936996112,19cyclictest31692-21awk22:40:010
9936996037,14cyclictest10475-21seq21:15:330
9936996035,16cyclictest276-21runrttasks19:26:300
9936996035,14cyclictest18703-21latency_hist23:55:020
9936996027,20cyclictest28100-21seq00:30:220
9936996022,23cyclictest3513-21ntp_states22:55:240
9936995933,17cyclictest946-21ntpd23:20:200
9936995926,20cyclictest26811-21/usr/sbin/munin20:15:240
9936995910,16cyclictest31859-21munin-run20:35:000
9936995833,15cyclictest2581-21seq22:50:500
9936995833,15cyclictest22711-21/usr/sbin/munin00:10:140
9936995832,15cyclictest24151-21/usr/sbin/munin22:10:120
9936995810,16cyclictest7468-21sshd21:05:180
9936995735,14cyclictest6280-21ntp_states21:00:220
9936995634,12cyclictest24681-21runrttasks00:16:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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