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2026-09-04 - 10:45

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 Fri Sep 04, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2968322560,2sleep029681-21ntpq22:40:220
676821200,3chrt6769-21sh23:17:000
1450021200,3chrt14501-21mailstats19:35:250
781321150,3chrt7797-21switchtime23:20:280
1293021150,4sleep012461-21/usr/sbin/munin23:40:280
1025721050,4sleep010295-21/usr/sbin/munin19:20:160
1618821010,3sleep016234-21wc23:55:010
165172960,4sleep016507-21latency_hist19:45:020
216822940,3sleep021737-21latency_hist20:05:020
169322915,69sleep016963-21/usr/sbin/munin19:45:260
285222900,4sleep028581-21swap22:35:270
231372890,3sleep023142-21df20:10:130
323012875,8sleep032349-21ps22:50:300
19562856,65sleep01981-21munin-run23:00:010
72742840,3sleep07311-21cat21:15:010
82982835,10sleep0288-21snmpd19:11:230
50742830,4sleep05101-21ntp_offset21:05:200
22672810,4sleep02308-21/usr/sbin/munin23:00:190
49442770,2sleep04945-21/usr/sbin/munin23:10:220
642827420,30sleep06464-21/usr/sbin/munin19:05:160
259572700,2sleep025956-21users00:30:330
314052685,50sleep0288-21snmpd22:46:170
104122650,2sleep010410-21ps21:25:270
7486996410,15cyclictest24264-21/usr/sbin/munin22:20:210
7486996136,16cyclictest8997-21/usr/sbin/munin21:20:210
7486996136,16cyclictest10131-21/usr/sbin/munin23:30:240
7486996132,22cyclictest26800-21runrttasks22:30:020
7486996021,15cyclictest226292chrt22:13:290
748699598,18cyclictest11596-21ntp_states21:30:280
7486995920,13cyclictest22791-21cpu00:20:100
7486995917,13cyclictest0-21swapper22:30:270
748699589,17cyclictest17470-21latency_hist00:00:000
748699589,16cyclictest8854-21ntpq23:25:200
748699589,14cyclictest26826-21/usr/sbin/munin00:35:190
748699588,18cyclictest11472-21/usr/sbin/munin19:25:200
748699588,17cyclictest29529-21/usr/sbin/munin20:35:300
748699587,17cyclictest18063-21ntp_states21:55:210
7486995832,17cyclictest16631-21/usr/sbin/munin21:50:180
7486995831,17cyclictest14267-21/usr/sbin/munin21:40:270
7486995812,32cyclictest3539-21/usr/sbin/munin21:00:220
7486995810,17cyclictest19679-21users22:00:280
7486995810,16cyclictest285-21sshd22:08:020
748699579,19cyclictest31240-21find20:40:240
748699579,19cyclictest28243-21/usr/sbin/munin20:30:160
748699578,17cyclictest15211-21/usr/sbin/munin21:45:150
748699577,18cyclictest20189-21/usr/sbin/munin00:10:270
748699577,16cyclictest3397-21munin-run21:00:000
748699576,17cyclictest8593-21idleruntime-cro21:20:000
7486995733,16cyclictest12847-21/usr/sbin/munin19:30:160
7486995732,15cyclictest19032-21/usr/sbin/munin00:05:150
7486995731,16cyclictest11282-21/usr/sbin/munin23:35:170
748699569,15cyclictest13800-21df_inode23:45:140
748699569,14cyclictest1083-21irqstats20:50:150
748699568,16cyclictest32261-21irqstats20:45:160
748699568,15cyclictest285-21sshd00:25:240
748699568,14cyclictest21472-21/usr/sbin/munin00:15:160
748699567,17cyclictest17916-21/usr/sbin/munin19:50:140
7486995632,15cyclictest23069-21/usr/sbin/munin22:15:160
7486995631,16cyclictest9195-21/usr/sbin/munin19:15:230
748699558,14cyclictest3927-21/usr/sbin/munin23:05:260
748699558,13cyclictest245042sleep020:15:160
7486995532,15cyclictest27030-21/usr/sbin/munin20:25:140
7486995510,30cyclictest19254-21df_inode19:55:150
7486995510,17cyclictest25975-21ntp_states20:20:250
7486995510,14cyclictest21852-21/usr/sbin/munin20:05:130
748699548,17cyclictest17616-21/usr/sbin/munin00:00:180
748699548,14cyclictest12620-21/usr/sbin/munin21:35:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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