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2025-09-18 - 15:26

OSADL QA Farm on Real-time of Mainline Linux

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

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.
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 rackeslot5s.osadl.org (updated Thu Sep 18, 2025 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
728499260,25cyclictest23974-21cron23:10:012
727799250,24cyclictest313-21systemd-journal19:35:000
728499240,23cyclictest19184-21apt-get23:01:312
7289992321,1cyclictest28149-21apt21:00:003
7289992321,1cyclictest0-21swapper/321:05:003
728999230,1cyclictest26554-21apt-get00:21:313
7284992323,0cyclictest2036-21apt-get20:06:282
7284992321,1cyclictest12435-21apt19:21:302
728499230,2cyclictest16853-21awk19:29:592
728499230,22cyclictest21684-21munin-run19:40:002
728499230,22cyclictest1345-21dump-pmu-power00:34:592
728499230,22cyclictest0-21swapper/220:41:292
728499230,1cyclictest28587-21perf00:24:592
728199230,23cyclictest0-21swapper/122:36:291
728199230,22cyclictest609-21polkitd22:00:001
728199230,22cyclictest31203-21dump-pmu-power23:25:001
7277992320,2cyclictest13665-21latency_hist23:55:000
727799230,22cyclictest31245-21sendmail20:00:010
727799230,22cyclictest31245-21sendmail20:00:010
727799230,22cyclictest14079-21perf21:40:010
727799230,22cyclictest0-21swapper/022:45:000
727799230,22cyclictest0-21swapper/021:51:290
727799230,22cyclictest0-21swapper/019:15:000
7289992220,1cyclictest8920-21apt20:19:593
728999220,2cyclictest1261-21perf20:05:003
728999220,21cyclictest9203-21turbostat.cron22:40:013
728999220,21cyclictest28823-21perf23:20:013
728999220,21cyclictest25758-21ls00:20:003
728999220,21cyclictest16206-21date00:00:013
728999220,21cyclictest16206-21date00:00:013
728999220,21cyclictest12049-21cron19:20:013
728999220,21cyclictest11014-21grep21:30:013
7284992222,0cyclictest0-21swapper/200:16:292
7284992221,1cyclictest0-21swapper/222:11:272
7284992221,0cyclictest0-21swapper/221:51:292
7284992221,0cyclictest0-21swapper/200:01:322
7284992220,1cyclictest6478-21perf23:39:592
7284992220,1cyclictest29238-21seq19:56:292
7284992220,1cyclictest29238-21seq19:56:292
7284992220,1cyclictest0-21swapper/221:00:002
728499220,21cyclictest8958-21sendmail-msp20:20:002
728499220,21cyclictest24310-21apt-get22:00:022
728499220,21cyclictest1277-21idleruntime-cro20:05:002
728499220,21cyclictest0-21swapper/222:51:282
728499220,21cyclictest0-21swapper/220:21:282
7281992220,1cyclictest31653-21apt-get20:01:281
728199220,21cyclictest6789-21perf22:35:001
728199220,21cyclictest6472-21sendmail-msp23:40:001
728199220,21cyclictest14111-21apt-get20:31:291
728199220,21cyclictest0-21swapper/122:21:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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