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2026-06-01 - 22:44

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 Mon Jun 01, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
168822580,2sleep01685-21open_inodes10:50:240
1691021690,4sleep016916-21/usr/sbin/munin11:50:110
1933721260,4chrt19316-21munin-run12:00:020
2779421210,4chrt27792-21sendmail_mailst10:25:260
1629921200,3chrt16298-21/usr/sbin/munin09:40:270
1266321190,4chrt12661-21users07:20:270
1880121180,3chrt18794-21ntp_states07:45:210
150121180,3sleep01502-21date08:45:010
1324221180,4chrt13238-21ntpq11:35:180
1730621140,4sleep017332-21ntp_states09:45:200
921521130,3sleep09134-21/usr/sbin/munin11:20:170
2488521130,3chrt24884-21wc08:10:010
2716921020,3sleep027170-21sshd10:24:210
1839521010,4sleep018331-21/usr/sbin/munin09:50:160
227822960,3sleep022827-21mailstats08:00:260
159772960,3sleep015918-21/usr/sbin/munin07:35:140
240472940,3sleep024049-21timerwakeupswit10:10:260
3268529210,8sleep032726-21memory10:45:170
225102900,3sleep022512-21switchtime12:10:260
128472860,3sleep012854-21modprobe11:34:590
53062820,4sleep05319-21/usr/sbin/munin11:05:130
44392820,4sleep04517-21sort11:00:290
830227117,30sleep08316-21irqstats07:05:170
9370996128,23cyclictest23352-21/usr/sbin/munin12:15:100
937099608,17cyclictest11891-21/usr/sbin/munin09:25:200
9370996019,10cyclictest0-21swapper12:23:470
937099598,17cyclictest22248-21systemctl08:00:000
937099597,19cyclictest6530-21/usr/sbin/munin11:10:250
9370995935,16cyclictest25961-21/usr/sbin/munin12:25:110
9370995933,17cyclictest19873-21/usr/sbin/munin09:55:210
9370995932,17cyclictest9870-21/usr/sbin/munin07:10:250
9370995932,16cyclictest10950-21/usr/sbin/munin09:20:240
9370995928,21cyclictest17954-21runrttasks07:41:290
9370995927,23cyclictest3335-21/usr/sbin/munin08:50:260
253092590,2sleep025310-21cat10:15:280
9370995833,16cyclictest7259-21/usr/sbin/munin09:05:280
9370995828,19cyclictest0-21swapper12:09:240
9370995816,15cyclictest946-21ntpd09:15:210
937099578,16cyclictest10705-21ntp_states11:25:210
937099577,18cyclictest20923-21/usr/sbin/munin10:00:270
937099577,17cyclictest27560-21/usr/sbin/munin08:20:200
937099577,16cyclictest7811-21/usr/sbin/munin11:15:290
937099577,16cyclictest28666-21/usr/sbin/munin10:30:150
9370995734,15cyclictest23122-21runrttasks10:08:000
9370995733,16cyclictest19512-21runrttasks12:00:130
9370995733,16cyclictest1608-21/usr/sbin/munin08:45:160
9370995732,16cyclictest14081-21runrttasks07:26:300
9370995731,17cyclictest4316-21/usr/sbin/munin08:55:200
9370995731,15cyclictest31586-21/usr/sbin/munin10:40:230
9370995721,24cyclictest285-21sshd08:38:200
9370995718,13cyclictest946-21ntpd12:35:190
937099568,19cyclictest15824-21ntp_kernel_err11:45:190
937099568,15cyclictest24956-21/usr/sbin/munin08:10:140
9370995633,14cyclictest30747-21runrttasks10:37:060
9370995633,14cyclictest20041-21/usr/sbin/munin07:50:200
9370995631,16cyclictest8344-21/usr/sbin/munin09:10:240
937099559,16cyclictest29137-21ntp_states08:25:230
937099559,16cyclictest26240-21/usr/sbin/munin08:15:160
937099559,16cyclictest14990-21/usr/sbin/munin07:30:240
937099558,13cyclictest14456-21/usr/sbin/munin09:35:190
9370995535,13cyclictest11821-21runrttasks07:19:160
9370995532,15cyclictest5896-21/usr/sbin/munin09:00:260
9370995531,15cyclictest13611-21/usr/sbin/munin09:30:260
9370995510,33cyclictest27276-21/usr/sbin/munin12:30:140
937099547,14cyclictest30174-21/usr/sbin/munin08:30:120
9370995432,15cyclictest3670-21runrttasks10:58:590
9370995431,15cyclictest14959-21runrttasks11:40:580
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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