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2026-04-24 - 02:23

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 Apr 23, 2026 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2325799260,25cyclictest8607-21sh11:38:523
23257992523,1cyclictest606-21dbus-daemon08:55:003
23256992523,1cyclictest0-21swapper/210:38:032
2325699250,24cyclictest7373-21cron08:50:012
2325699250,24cyclictest16980-21diskmemload12:10:132
2325599250,24cyclictest23044-21ssh11:52:381
23254992523,2cyclictest0-21swapper/011:49:170
23254992523,1cyclictest16980-21diskmemload10:45:460
23254992523,1cyclictest16980-21diskmemload09:55:300
23257992423,0cyclictest0-21swapper/308:25:203
2325799240,23cyclictest30659-21sh09:22:253
2325799240,23cyclictest18917-21diskmemload09:42:083
2325799240,23cyclictest0-21swapper/312:29:013
2325799240,23cyclictest0-21swapper/311:52:383
2325799240,23cyclictest0-21swapper/310:46:473
23256992423,1cyclictest16980-21diskmemload10:41:192
2325699240,23cyclictest16080-21apt-get09:40:222
2325699240,23cyclictest14034-21ssh11:11:302
23255992422,1cyclictest9777-21idleruntime-cro08:55:001
2325599240,24cyclictest0-21swapper/111:30:371
2325599240,24cyclictest0-21swapper/110:43:061
2325599240,24cyclictest0-21swapper/109:56:291
2325599240,23cyclictest11870-21ssh10:06:161
2325599240,23cyclictest11870-21ssh10:06:161
2325599240,1cyclictest5636-21ssh10:31:531
2325599240,0cyclictest5635-21apt-get07:40:181
2325599240,0cyclictest0-21swapper/111:38:521
23254992422,1cyclictest21809-21sh11:50:360
23254992422,1cyclictest14762-21/usr/sbin/munin12:15:300
2325499240,23cyclictest15561-21sendmail09:40:010
2325499240,23cyclictest0-21swapper/010:55:080
2325499240,0cyclictest0-21swapper/012:26:280
23257992323,0cyclictest0-21swapper/312:36:203
23257992323,0cyclictest0-21swapper/312:06:073
23257992323,0cyclictest0-21swapper/311:28:333
23257992323,0cyclictest0-21swapper/310:35:253
23257992322,1cyclictest0-21swapper/311:48:023
23257992321,1cyclictest0-21swapper/311:25:003
23257992320,2cyclictest10608-21ssh10:05:263
23257992320,2cyclictest10608-21ssh10:05:263
2325799230,23cyclictest0-21swapper/311:55:043
2325799230,23cyclictest0-21swapper/311:06:443
2325799230,22cyclictest901-21ssh10:27:293
2325799230,22cyclictest1471-21ssh12:03:383
2325799230,22cyclictest12109-21rm09:35:273
2325799230,22cyclictest0-21swapper/310:57:353
2325799230,22cyclictest0-21swapper/307:25:213
2325799230,1cyclictest0-21swapper/310:17:033
2325799230,0cyclictest0-21swapper/311:30:373
2325799230,0cyclictest0-21swapper/311:15:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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