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2026-09-01 - 10:01

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Tue Sep 01, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
327122590,3sleep03270-21tr21:00:210
63622360,2sleep0634-21mailstats22:55:250
1104021480,2sleep011038-21ntp_states21:30:220
400721400,2sleep04008-21latency_hist23:10:010
2050721300,3chrt20505-21memory00:15:170
1762621250,3chrt17624-21users00:00:280
2415621230,4chrt24157-21latency_hist00:30:010
2354721190,3chrt23548-21readlink22:20:010
2935121170,4chrt29352-21/usr/sbin/munin22:40:270
69519911279,17cyclictest14627-21/usr/sbin/munin21:45:250
69519911179,18cyclictest307-21munin-node23:20:100
69519911085,14cyclictest25962-21chrt22:28:460
69519911083,16cyclictest18582-21wc19:55:020
69519911083,15cyclictest7829-21chrt21:18:210
69519911066,28cyclictest21256-21/usr/sbin/munin20:05:260
69519910977,21cyclictest29177-21memory20:35:180
2785021090,4sleep027704-21/usr/sbin/munin20:30:160
69519910883,15cyclictest9219-21chrt21:24:020
69519910881,14cyclictest23827-21irqstats22:20:170
69519910878,18cyclictest12554-21runrttasks23:41:050
69519910876,18cyclictest13155-21/usr/sbin/munin23:45:180
69519910781,15cyclictest2755-21cat23:05:020
69519910780,15cyclictest21827-21memory00:20:180
69519910682,13cyclictest12101-21/usr/sbin/munin21:35:130
69519910679,15cyclictest15911-21/usr/sbin/munin21:50:290
69519910678,18cyclictest26840-21runrttasks20:25:250
69519910677,17cyclictest17780-21/usr/sbin/munin21:55:300
69519910582,14cyclictest15919-21chrt19:44:410
69519910581,13cyclictest15693-21cat23:55:010
69519910580,14cyclictest1001-21/usr/sbin/munin20:50:290
69519910579,14cyclictest6630-21sed23:20:010
69519910576,16cyclictest26181-21runrttasks00:36:130
69519910576,16cyclictest10111-21chrt21:25:450
69519910573,20cyclictest9610-21/usr/sbin/munin23:30:240
69519910481,13cyclictest5149-21chrt23:14:060
69519910480,14cyclictest30360-21df_inode20:40:130
69519910479,14cyclictest24973-21seq20:19:570
69519910477,15cyclictest276-21runrttasks19:18:500
69519910477,15cyclictest14090-21users19:35:290
69519910476,16cyclictest31932-21ps20:45:260
69519910379,14cyclictest13413-21sort19:35:010
69519910378,13cyclictest9722-21/usr/sbin/munin19:20:130
69519910361,15cyclictest21079-21/usr/sbin/munin22:10:320
69519910279,13cyclictest19313-21ntp_states00:10:180
69519910278,13cyclictest16276-21memory19:45:170
69519910277,16cyclictest276-21runrttasks21:41:300
69519910277,13cyclictest26530-21ntp_states22:30:210
69519910276,15cyclictest30293-21ls22:45:170
69519910276,14cyclictest6099-21wc21:10:260
69519910276,14cyclictest18747-21netstat22:00:170
69519910275,16cyclictest22826-21ntp_states20:10:220
69519910261,13cyclictest19910-21date20:00:020
69519910177,13cyclictest20070-21ntpq22:05:220
69519910175,17cyclictest18989-21latency_hist00:10:020
69519910166,20cyclictest19968-21munin-node20:00:130
69519910077,13cyclictest10929-21chrt19:25:100
69519910077,12cyclictest25131-21chrt00:33:100
69519910073,16cyclictest10627-21df_inode23:35:140
6951999976,13cyclictest8285-21ntp_states23:25:220
6951999976,13cyclictest76432sleep019:10:290
6951999976,12cyclictest27814-21ntp_states22:35:210
6951999968,19cyclictest4287-21/usr/sbin/munin21:05:240
6951999965,23cyclictest16906-21sendmail00:00:010
6951999868,18cyclictest7019-21sort19:10:030
6951999866,18cyclictest25143-21/usr/sbin/munin20:20:150
6951999864,21cyclictest31700-21chrt22:50:240
6951999860,14cyclictest1984-21sshd20:55:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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