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2025-08-21 - 21:28

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Thu Aug 21, 2025 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1623991060,20rtkit-daemon0-21swapper/312:20:013
1623991040,17rtkit-daemon0-21swapper/308:35:313
162399970,21rtkit-daemon2197014-21PK-Backend11:30:093
162399890,10rtkit-daemon1753-21gnome-shell09:56:452
384387928340,36sleep30-21swapper/307:08:553
39314402820,4chrt3931439-21hddtemp_smartct11:10:192
162399750,5rtkit-daemon0-21swapper/207:22:552
38869012720,8sleep33242253-21nautilus09:10:023
384367027039,25sleep00-21swapper/007:06:150
384274326446,10sleep10-21swapper/107:05:161
162399630,9rtkit-daemon1622-21rtkit-daemon11:37:163
384288026247,9sleep20-21swapper/207:05:172
162399610,9rtkit-daemon1622-21rtkit-daemon10:58:272
162399610,9rtkit-daemon1622-21rtkit-daemon10:58:262
162399600,9rtkit-daemon1622-21rtkit-daemon12:34:553
162399600,9rtkit-daemon1622-21rtkit-daemon12:31:482
162399600,9rtkit-daemon1622-21rtkit-daemon11:18:463
162399590,8rtkit-daemon1622-21rtkit-daemon10:47:493
162399590,8rtkit-daemon1622-21rtkit-daemon10:20:263
162399580,9rtkit-daemon1622-21rtkit-daemon10:11:503
162399570,9rtkit-daemon1622-21rtkit-daemon10:16:343
162399570,8rtkit-daemon1622-21rtkit-daemon11:55:063
162399560,8rtkit-daemon1622-21rtkit-daemon12:07:463
162399540,9rtkit-daemon1622-21rtkit-daemon10:02:273
38929302530,13sleep234-21ksoftirqd/209:25:142
162399530,8rtkit-daemon1622-21rtkit-daemon11:52:332
162399530,8rtkit-daemon1622-21rtkit-daemon11:15:052
38704032520,6sleep32197014-21PK-Backend08:20:313
162399520,8rtkit-daemon1622-21rtkit-daemon12:04:583
162399520,8rtkit-daemon1622-21rtkit-daemon11:22:152
384412799491,19cyclictest438-20systemd-journal07:25:003
162399480,34rtkit-daemon1753-21gnome-shell07:38:252
3844127994731,12cyclictest855-21dbus-daemon09:18:523
3844124994716,18cyclictest1753-21gnome-shell10:35:142
3844121994713,6cyclictest39594012latency_hist12:30:031
162399470,33rtkit-daemon1753-21gnome-shell08:31:272
38934222460,5sleep10-21swapper/109:25:251
38790262460,17sleep126-21ksoftirqd/108:45:241
3844127994628,6cyclictest42-21ksoftirqd/312:35:143
384412199462,6cyclictest141rcu_preempt11:38:381
3844121994528,13cyclictest855-21dbus-daemon09:51:281
3844121994525,16cyclictest3872549-21sh08:30:001
3844121994525,16cyclictest3872549-21sh08:30:001
384412199452,39cyclictest854-21avahi-daemon10:02:511
162399450,36rtkit-daemon869-21irqbalance10:40:053
38995452440,12chrt251rcuc/109:45:011
38911202440,5sleep20-21swapper/209:20:142
3844127994427,12cyclictest438-20systemd-journal11:02:043
3844127994426,13cyclictest3905274-21/usr/sbin/munin10:00:023
3844127994424,15cyclictest3899948-40apt-check09:45:173
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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