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2026-05-11 - 21:51

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #4

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 100 highest latencies:
System rack7slot4s.osadl.org (updated Mon May 11, 2026 12:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
173899511,35cyclictest11423-21ssh12:05:141
1757994618,25cyclictest35966irq/58-eth011:00:123
174799462,32cyclictest20360-21ssh12:10:132
174799462,32cyclictest20360-21ssh12:10:132
174799461,24cyclictest22340-21sh10:05:132
172299464,36cyclictest9584-21ssh09:40:130
172299463,32cyclictest4244-21ssh11:25:130
175799443,27cyclictest35966irq/58-eth010:35:133
1738994418,3cyclictest21-21ksoftirqd/107:15:121
1747994215,19cyclictest1708-21cyclictest11:50:122
173899422,19cyclictest25662-21ssh11:55:131
1747994118,18cyclictest1-21systemd08:35:132
174799411,33cyclictest0-21swapper/211:10:142
174799411,33cyclictest0-21swapper/211:10:132
173899413,23cyclictest27635-21ssh11:20:121
172299401,30cyclictest20137-21diskmemload12:35:150
175799391,8cyclictest35966irq/58-eth009:25:133
174799391,27cyclictest29180-21ssh12:15:142
173899392,3cyclictest131rcu_preempt11:35:131
174799387,7cyclictest0-21swapper/209:00:122
173899384,26cyclictest32578-21ssh12:35:131
175799373,12cyclictest35966irq/58-eth012:10:133
175799373,12cyclictest35966irq/58-eth012:10:133
174799377,13cyclictest261rcuc/210:50:132
175799362,20cyclictest35966irq/58-eth011:35:133
174799369,15cyclictest13368-1kworker/u9:211:00:142
174799347,16cyclictest27-21ksoftirqd/210:30:142
174799347,16cyclictest27-21ksoftirqd/210:30:142
174799331,21cyclictest7925-21ssh10:15:132
1747993216,7cyclictest27-21ksoftirqd/209:20:142
172299321,25cyclictest4342-21ssh09:55:140
174799315,16cyclictest27346irq/40-dwc2_hso11:45:122
174799312,17cyclictest5768-21ssh12:20:132
174799311,15cyclictest0-21swapper/211:30:122
172299311,2cyclictest131rcu_preempt09:10:130
175799304,18cyclictest35966irq/58-eth011:30:123
174799302,22cyclictest31375-21ssh10:10:142
174799301,13cyclictest0-21swapper/207:40:142
174799293,17cyclictest20540-21ssh09:10:142
174799293,16cyclictest27346irq/40-dwc2_hso10:40:132
173899291,20cyclictest0-21swapper/108:10:141
175799286,8cyclictest35966irq/58-eth010:45:133
175799285,13cyclictest35966irq/58-eth009:15:133
175799281,15cyclictest35966irq/58-eth009:55:143
175799281,13cyclictest0-21swapper/309:20:233
174799283,14cyclictest27346irq/40-dwc2_hso08:00:122
174799282,18cyclictest22193-21ssh11:35:142
174799282,15cyclictest693-21ssh11:05:152
174799282,15cyclictest14676-21ssh12:25:142
175799279,6cyclictest0-21swapper/311:05:253
175799272,9cyclictest0-21swapper/309:45:133
175799272,10cyclictest0-21swapper/310:40:133
1757992717,7cyclictest35966irq/58-eth009:30:133
1757992710,3cyclictest0-21swapper/311:15:213
174799272,19cyclictest0-21swapper/207:35:132
174799271,21cyclictest21196-21cut07:30:162
175799268,7cyclictest0-21swapper/312:24:543
175799263,5cyclictest0-21swapper/310:05:293
175799262,17cyclictest0-21swapper/310:30:153
175799262,17cyclictest0-21swapper/310:30:153
175799261,13cyclictest35966irq/58-eth008:20:123
174799262,6cyclictest27-21ksoftirqd/209:45:132
174799261,21cyclictest5843-21ls08:55:012
174799261,18cyclictest0-21swapper/209:05:142
1747992610,12cyclictest10481-21grep07:15:282
172299261,20cyclictest27648-21apt-get09:50:140
172299261,19cyclictest19056-21sd-accept08:35:130
175799259,4cyclictest0-21swapper/311:20:203
174799257,15cyclictest31744-21kthreadcore09:15:212
174799255,13cyclictest6775-21cut07:45:272
174799252,14cyclictest27346irq/40-dwc2_hso10:20:132
174799251,19cyclictest7510-21cut09:55:232
174799251,18cyclictest647-21ssh09:35:132
174799251,18cyclictest647-21ssh09:35:132
1747992510,12cyclictest17358-21cron08:00:002
173899255,12cyclictest20546-21ssh09:10:141
175799242,5cyclictest0-21swapper/312:30:143
174799244,6cyclictest13368-1kworker/u9:210:55:142
174799243,17cyclictest0-21swapper/209:25:142
174799242,16cyclictest0-21swapper/210:35:142
174799242,16cyclictest0-21swapper/209:50:052
174799241,19cyclictest32369-21ls12:35:022
174799241,13cyclictest2452-21sh11:40:262
174799241,13cyclictest18676-21ssh11:15:152
174799241,13cyclictest13362-21ssh10:00:132
174799240,21cyclictest28653-21find08:45:122
174799240,12cyclictest27933-21ls11:20:172
1738992415,4cyclictest0-21swapper/111:50:131
1738992411,7cyclictest21-21ksoftirqd/107:30:131
172299243,12cyclictest18587-21ssh09:45:110
172299241,5cyclictest9471-21ps12:20:270
172299241,4cyclictest0-21swapper/011:30:020
175799239,9cyclictest35966irq/58-eth012:05:143
1757992312,6cyclictest35966irq/58-eth009:50:153
174799231,19cyclictest2805-21tr12:35:232
174799231,11cyclictest25681-21sh11:55:132
1738992311,3cyclictest20137-21diskmemload12:13:511
1738992311,3cyclictest20137-21diskmemload12:13:511
172299231,18cyclictest29133-21find12:15:110
172299231,17cyclictest2423-21ssh12:00:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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