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2026-08-23 - 07:07

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 Sun Aug 23, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3188122550,3sleep031879-21fgrep00:00:280
1402321600,3sleep014025-21switchtime20:45:300
2522421540,3sleep025220-21cat19:25:000
185221270,3chrt1853-21cat22:05:170
2916521260,3chrt29163-21irqstats21:45:150
849321200,3chrt8494-21/usr/sbin/munin22:30:240
969521130,3sleep0307-21munin-node20:30:120
2148021120,2sleep021482-21ls21:15:200
3208021050,2sleep032079-21switchtime21:55:260
3055421020,3sleep030584-21cat19:45:150
202002990,4sleep020261-21/usr/sbin/munin23:15:260
110352990,4sleep01327-21sendmail-mta20:35:160
40492980,2sleep04047-21idleruntime-cro00:20:010
226752980,3sleep022676-21/usr/sbin/munin21:20:160
292292820,3sleep029298-21mailstats23:50:250
32612800,4sleep03282-21ls20:05:150
80572730,2sleep08059-21basename22:30:010
2070527321,31sleep020734-21users19:05:260
179012710,2sleep017904-21sort21:00:280
21349996429,26cyclictest5133-21runrttasks22:17:240
2134999619,19cyclictest22435-21/usr/sbin/munin23:25:300
21349996136,15cyclictest9543-21/usr/sbin/munin22:35:160
21349996135,16cyclictest20388-21/usr/sbin/munin21:10:260
21349996126,14cyclictest18332-21runrttasks23:09:420
21349996119,16cyclictest26185-21tr23:40:010
2134999609,18cyclictest23863-21/usr/sbin/munin21:25:130
21349996010,17cyclictest16197-21tr23:00:200
286292593,5sleep00-21swapper23:49:060
2134999599,18cyclictest27593-21latency_hist21:40:000
21349995934,16cyclictest559-21/usr/sbin/munin22:00:150
21349995934,15cyclictest6204-21/usr/sbin/munin22:20:290
21349995932,16cyclictest21698-21/usr/sbin/munin23:20:290
2134999589,18cyclictest31462-21idleruntime-cro21:55:010
2134999589,14cyclictest18761-21ntpq23:10:190
2134999589,14cyclictest13338-21/usr/sbin/munin22:50:270
2134999587,15cyclictest6452-21sshd00:28:380
21349995834,15cyclictest23468-21runrttasks19:16:360
21349995833,16cyclictest14889-21/usr/sbin/munin20:50:140
21349995812,18cyclictest5344-21awk00:25:000
21349995811,15cyclictest6749-21/usr/sbin/munin00:30:210
21349995810,16cyclictest27898-21/usr/sbin/munin19:35:210
108422583,5sleep00-21swapper22:40:180
2134999579,16cyclictest12336-21ntp_states22:45:200
2134999579,16cyclictest12240-21/usr/sbin/munin20:40:210
2134999577,18cyclictest26615-21/usr/sbin/munin19:30:260
21349995732,16cyclictest27945-21/usr/sbin/munin21:40:190
21349995719,13cyclictest7407-21/usr/sbin/munin20:20:250
21349995710,16cyclictest6013-21ntpq20:15:190
21349995710,15cyclictest3254-21netstat22:10:190
2134999569,15cyclictest2167-21ntpq20:00:210
2134999567,16cyclictest29207-21/usr/sbin/munin19:40:230
21349995633,15cyclictest30469-21/usr/sbin/munin23:55:230
21349995632,14cyclictest4625-21/usr/sbin/munin20:10:170
21349995629,16cyclictest18762-21/usr/sbin/munin21:05:160
2134999559,14cyclictest586-21/usr/sbin/munin19:55:260
21349995532,15cyclictest484-21/usr/sbin/munin00:05:190
21349995532,15cyclictest14973-21/usr/sbin/munin22:55:250
21349995531,14cyclictest8680-21/usr/sbin/munin20:25:240
21349995529,16cyclictest16636-21/usr/sbin/munin20:55:290
21349995515,14cyclictest8031-21cpu00:35:110
21349995510,16cyclictest25412-21ntpq21:30:210
21349995510,14cyclictest26369-21df_inode23:40:130
2134999549,14cyclictest23904-21memory23:30:180
21349995429,16cyclictest25478-21/usr/sbin/munin19:25:180
21349995428,16cyclictest21595-21runrttasks19:10:170
2134999537,17cyclictest31847-21/usr/sbin/munin19:50:140
21349995331,14cyclictest2623-21runrttasks00:14:060
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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