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2025-07-01 - 07:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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 rack3slot3s.osadl.org (updated Tue Jul 01, 2025 00:43:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
261825822260,2sleep10-21swapper/122:08:321
24027842146100,16sleep30-21swapper/319:05:543
2403006214297,15sleep00-21swapper/019:08:430
24029422141100,34sleep10-21swapper/119:07:531
24029332131109,15sleep20-21swapper/219:07:462
247759221300,2sleep00-21swapper/020:20:200
2403232993833,3cyclictest0-21swapper/322:45:163
2403232993421,10cyclictest0-21swapper/321:10:203
2403232992923,4cyclictest0-21swapper/322:25:303
2403232992722,3cyclictest0-21swapper/300:30:173
2403232992520,3cyclictest1-21systemd19:39:593
2403232992512,9cyclictest262-21systemd-journal22:01:473
2403232992420,2cyclictest0-21swapper/323:27:303
2403232992420,2cyclictest0-21swapper/300:20:003
2403232992419,3cyclictest1-21systemd00:00:013
2403232992419,3cyclictest0-21swapper/323:20:263
240323299241,19cyclictest2834392-21sshd00:27:463
2403232992319,2cyclictest0-21swapper/320:05:173
2403232992314,6cyclictest2683756-21sh22:50:163
2403232992313,7cyclictest2809243-21grep00:10:223
2403232992312,8cyclictest2778743-21tr23:50:173
2403232992218,2cyclictest0-21swapper/321:35:033
2403232992217,3cyclictest2722809-21grep23:15:143
2403232992217,3cyclictest2588733-21head21:50:163
2403232992216,4cyclictest1-21systemd22:16:473
2403232992215,5cyclictest2439602-21grep19:40:313
2403232992214,6cyclictest2773979-21grep23:45:283
2403232992214,5cyclictest2557248-21fschecks_count21:30:163
2403232992211,7cyclictest262-21systemd-journal00:00:473
2403232992211,7cyclictest2419329-21/usr/sbin/munin19:20:283
2403232992210,8cyclictest2585151-21wc21:45:323
240323299214,4cyclictest2490995-21/usr/sbin/munin20:35:163
2403232992118,2cyclictest2534018-21kthreadcore21:15:163
240323299211,7cyclictest2407237-21ntpq19:10:213
2403232992117,2cyclictest2720496-21sh23:12:343
2403232992117,2cyclictest2667361-21packagekitd22:40:033
2403232992117,2cyclictest0-21swapper/323:40:173
2403232992117,2cyclictest0-21swapper/300:20:233
2403232992116,3cyclictest1056-21cron19:55:013
2403232992114,5cyclictest2504107-21cut20:45:183
2403232992112,6cyclictest943-21runrttasks23:30:463
240323299211,18cyclictest2596623-21runrttasks21:55:193
240323299211,18cyclictest2579984-21taskset21:44:523
240323299211,17cyclictest2707027-21cut23:05:163
2403232992110,8cyclictest2613682-21cat22:05:203
268279222010,4sleep2421ktimers/222:49:462
240323299208,8cyclictest2638060-21tr22:20:203
240323299202,14cyclictest2525370-21cron21:10:013
240323299201,6cyclictest2848769-21runrttasks00:36:303
2403232992016,2cyclictest0-21swapper/320:50:253
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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