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2026-05-26 - 03:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot3s.osadl.org (updated Tue May 26, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21002233157,24sleep00-21swapper/019:05:470
24002223193,20sleep30-21swapper/319:09:393
21532202165,25sleep10-21swapper/119:06:281
21072200164,24sleep20-21swapper/219:05:522
206821490,4sleep1251399cyclictest21:33:191
2519999794,2cyclictest0-21swapper/222:00:522
2519999288,3cyclictest0-21swapper/222:39:472
2519997977,1cyclictest0-21swapper/222:57:022
2519997168,2cyclictest0-21swapper/222:27:502
2519996461,2cyclictest0-21swapper/221:13:392
2519995344,8cyclictest0-21swapper/220:24:522
305852490,1sleep20-21swapper/221:25:142
252699432,9cyclictest10006-21diskstats23:05:133
252699381,10cyclictest18631-21sshd00:37:173
2504993810,13cyclictest27024-21awk23:45:000
2504993711,12cyclictest28593-21munin-run22:35:010
252699361,11cyclictest4639-21/usr/sbin/munin21:40:263
2526993513,19cyclictest3693-21/usr/sbin/munin00:05:183
251999351,26cyclictest0-21swapper/223:26:452
252699348,3cyclictest20646-21/usr/sbin/munin23:30:223
252699348,3cyclictest20646-21/usr/sbin/munin23:30:223
252699347,3cyclictest808-21snmpd00:15:373
2526993410,3cyclictest18798-21users20:55:263
70402330,5sleep2251999cyclictest00:10:212
252699336,3cyclictest17833-21/usr/sbin/munin22:10:193
252699331,14cyclictest0-21swapper/320:40:213
252699331,14cyclictest0-21swapper/319:52:563
2526993310,3cyclictest23807-21/usr/sbin/munin21:10:143
252699329,2cyclictest827-21runrttasks00:32:013
252699328,3cyclictest18450-21/usr/sbin/munin23:25:233
252699328,3cyclictest1459-21/usr/sbin/munin00:00:253
252699327,4cyclictest17654-21/usr/sbin/munin23:20:253
252699325,3cyclictest87350irq/126-enp1s0-22:30:113
252699321,6cyclictest11972-21munin-run19:30:023
252699321,5cyclictest0-21swapper/322:27:333
252699321,19cyclictest0-21swapper/322:19:453
2526993211,3cyclictest3983-21unixbench_singl21:35:263
252699321,12cyclictest27294-21sshd20:04:163
2526993210,3cyclictest27455-21expr23:45:133
252699319,3cyclictest9034-21/usr/sbin/munin21:50:173
252699319,3cyclictest827-21runrttasks00:23:103
252699318,3cyclictest12849-21sed19:30:153
252699316,3cyclictest87350irq/126-enp1s0-23:00:013
252699313,3cyclictest87650irq/129-enp1s0-22:20:133
252699313,3cyclictest87650irq/129-enp1s0-22:20:133
252699311,5cyclictest344-21processes23:55:243
2526993111,3cyclictest7271-21timerandwakeup00:10:233
2526993111,3cyclictest6533-21expr20:30:133
252699311,13cyclictest29946-21pmu-power22:35:203
252699309,3cyclictest827-21runrttasks00:29:083
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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