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2025-09-18 - 04:11

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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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 Sep 18, 2025 00:44:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
286085921020,5sleep00-21swapper/000:25:200
28340722930,3chrt2834067-21cpu23:10:162
28340722930,3chrt2834067-21cpu23:10:152
274962028268,9sleep20-21swapper/219:09:162
274962028268,9sleep20-21swapper/219:09:152
274950526848,14sleep30-21swapper/319:07:483
274950526848,14sleep30-21swapper/319:07:483
162399670,58rtkit-daemon0-21swapper/019:08:110
162399670,58rtkit-daemon0-21swapper/019:08:110
162399650,45rtkit-daemon1753-21gnome-shell23:02:012
2749841996311,47cyclictest1622-21rtkit-daemon21:20:210
274984599613,11cyclictest1938-21gsd-housekeepin23:46:041
274942626141,14sleep10-21swapper/119:06:461
274942626141,14sleep10-21swapper/119:06:461
27786872590,5sleep3411rcuc/320:25:313
2749851995820,11cyclictest2793330-21basename21:10:173
2749841995824,7cyclictest13-21ksoftirqd/022:03:220
274984599565,28cyclictest2848862-21sed23:50:241
274984599565,23cyclictest2790229-21/usr/sbin/munin21:00:121
274984599545,27cyclictest2785373-40lsb_release20:45:211
2749851995322,26cyclictest1753-21gnome-shell23:23:413
274984599538,40cyclictest1622-21rtkit-daemon23:33:421
274984599535,28cyclictest1753-21gnome-shell22:13:541
274984599535,28cyclictest1753-21gnome-shell22:13:531
274984199535,44cyclictest1622-21rtkit-daemon22:39:340
2749841995321,16cyclictest13-21ksoftirqd/020:26:350
274985199524,21cyclictest2798835-21awk21:25:253
2749851995219,12cyclictest2791709-21apt-get21:05:003
2749851995218,11cyclictest2750957-21sed19:10:313
274985199521,20cyclictest1753-21gnome-shell23:18:333
274984599526,22cyclictest2840181-21/usr/sbin/munin23:25:241
274984599522,16cyclictest1734-21gvfs-udisks2-vo00:31:561
2749845995211,19cyclictest2758160-21taskset19:30:201
2749841995224,16cyclictest13-21ksoftirqd/022:09:470
27603492510,6sleep32197014-21PK-Backend19:35:283
274985199512,44cyclictest1753-21gnome-shell00:05:143
2749851995122,25cyclictest1753-21gnome-shell19:31:263
2749851995121,10cyclictest42-21ksoftirqd/323:48:373
2749851995116,10cyclictest2805443-21expr21:45:133
274985199511,43cyclictest854-21avahi-daemon19:17:533
2749851995112,13cyclictest438-20systemd-journal20:59:553
2749851995110,37cyclictest0-21swapper/321:22:113
274985199509,18cyclictest1753-21gnome-shell22:20:343
274985199502,43cyclictest1753-21gnome-shell21:31:323
2749851995019,11cyclictest2826929-21grep22:50:143
2749851995010,17cyclictest1753-21gnome-shell22:58:293
2749851995010,16cyclictest1753-21gnome-shell20:20:003
274984599504,27cyclictest1753-21gnome-shell19:16:441
274984599504,17cyclictest1753-21gnome-shell23:21:081
274984599500,27cyclictest1753-21gnome-shell00:16:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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