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2026-08-15 - 06:58

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 15, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2933523120,3sleep029339-21ntp_kernel_pll_22:40:200
2107521610,3sleep021077-21latency_hist00:15:020
1105221510,3sleep011051-21wc19:25:010
207421350,2sleep02076-21wc20:55:170
352121130,3sleep03525-21ntp_states21:00:230
1144121110,4chrt11442-21mailstats21:30:240
2718821100,3sleep027245-21users20:25:280
1894921020,3sleep018967-21/usr/sbin/munin19:55:130
255982960,3sleep025640-21/usr/sbin/munin20:20:190
227802920,3sleep022782-21missed_timers22:15:180
315222880,4sleep031575-21date22:50:010
239762880,4sleep024003-21/usr/sbin/munin00:25:210
138722877,10sleep013870-21ntp_states21:40:220
266682780,3sleep026670-21missed_timers22:30:180
620527420,30sleep06216-21ntp_states19:05:180
75082710,2sleep07506-21ls23:20:270
289152673,5sleep00-21swapper20:33:340
7139996435,16cyclictest18792-21df22:00:130
7139996323,14cyclictest7748-21runrttasks21:15:480
713999628,25cyclictest11285-21/usr/sbin/munin19:25:170
7139996224,14cyclictest9502-21runrttasks19:18:340
713999607,19cyclictest1769-21/usr/sbin/munin23:00:270
7139996031,16cyclictest32262-21systemctl20:45:250
7139996010,15cyclictest9796-21ntp_states23:30:200
713999599,18cyclictest21791-21ntpq20:05:240
713999598,13cyclictest444-21/usr/sbin/munin22:55:170
7139995934,16cyclictest13485-21/usr/sbin/munin23:45:140
7139995933,16cyclictest6212-21/usr/sbin/munin21:10:260
7139995931,16cyclictest15118-21/usr/sbin/munin21:45:180
7139995930,16cyclictest3497-21sendmail_mailtr23:05:250
7139995916,15cyclictest10277-21cat21:25:260
713999588,18cyclictest16143-21/usr/sbin/munin21:50:150
713999588,17cyclictest23059-21ntp_states20:10:220
713999588,17cyclictest14670-21/usr/sbin/munin23:50:180
713999588,15cyclictest17604-21/usr/sbin/munin19:50:180
713999588,15cyclictest15948-21/usr/sbin/munin23:55:170
713999588,13cyclictest18836-21ntp_states00:05:220
713999587,17cyclictest307-21munin-node00:20:100
713999586,18cyclictest12399-21/usr/sbin/munin19:30:180
7139995833,15cyclictest23910-21munin-node22:20:090
7139995831,17cyclictest13289-21runrttasks21:38:560
7139995811,16cyclictest8513-21ntp_states23:25:220
7139995810,15cyclictest11234-21/usr/sbin/munin23:35:270
713999578,19cyclictest15005-21latency_hist19:40:020
713999578,16cyclictest15301-21ntpq19:40:200
713999578,15cyclictest4521-21/usr/sbin/munin21:05:110
713999577,17cyclictest774-21irqstats20:50:160
713999577,16cyclictest20028-21egrep22:05:110
7139995736,14cyclictest16598-21/usr/sbin/munin19:45:170
7139995734,14cyclictest17424-21/usr/sbin/munin00:00:180
7139995733,15cyclictest8627-21/usr/sbin/munin21:20:190
7139995732,16cyclictest6096-21/usr/sbin/munin23:15:240
7139995732,15cyclictest7494-21/usr/sbin/munin19:10:190
7139995730,17cyclictest26568-21ntp_states00:35:220
7139995711,17cyclictest30533-21/usr/sbin/munin20:40:200
713999569,16cyclictest21380-21/usr/sbin/munin00:15:190
713999569,14cyclictest307-21munin-node21:55:130
713999568,16cyclictest4394-21/usr/sbin/munin23:10:110
713999567,15cyclictest20313-21/usr/sbin/munin20:00:160
7139995633,15cyclictest32622-21sshd22:53:410
7139995632,15cyclictest25155-21runrttasks20:19:320
7139995631,15cyclictest25081-21/usr/sbin/munin00:30:130
7139995610,15cyclictest12397-21ntp_states23:40:230
713999559,16cyclictest29277-21df20:35:140
7139995532,15cyclictest28671-21runrttasks22:38:020
7139995531,15cyclictest25336-21/usr/sbin/munin22:25:150
713999547,14cyclictest21595-21ntp_states22:10:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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