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2026-04-20 - 23:49

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 Apr 20, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2875099613,33cyclictest21863-21ssh09:50:132
2875899494,26cyclictest35966irq/58-eth009:10:143
2875099480,34cyclictest19739-21ssh10:25:142
2875099480,34cyclictest19739-21ssh10:25:132
2873399462,37cyclictest28655-21ssh10:30:110
2875099451,31cyclictest23874-21ssh09:15:152
2875099443,32cyclictest28670-21ssh10:30:122
2875899431,26cyclictest35966irq/58-eth009:30:133
2875899412,26cyclictest35966irq/58-eth008:10:133
2875899411,27cyclictest35966irq/58-eth010:45:123
28758994112,6cyclictest35966irq/58-eth010:10:143
28739994033,5cyclictest0-21swapper/111:55:141
2873999402,27cyclictest18440-21ssh09:30:131
2875899392,23cyclictest35966irq/58-eth011:45:143
2875099392,20cyclictest17447-21/usr/sbin/munin11:00:142
2875099381,22cyclictest16741-21ssh12:30:152
2873999374,19cyclictest15410-21ssh11:35:131
2873999362,31cyclictest25707-21ssh12:35:161
2873999360,3cyclictest131rcu_preempt07:35:121
2873399361,27cyclictest9451-21ssh09:25:140
2873399361,27cyclictest9451-21ssh09:25:130
2875099352,27cyclictest10163-21ssh11:13:142
2875099351,28cyclictest14845-21ssh10:57:132
2873999357,16cyclictest27789-21ssh12:00:131
2873999353,29cyclictest9905-21sshd09:05:141
28733993514,11cyclictest28721-21cyclictest07:30:120
2873999343,26cyclictest18196-21apt-get08:40:131
2873399342,25cyclictest31288-21ssh12:20:130
2875899333,14cyclictest35966irq/58-eth011:30:113
28739993321,9cyclictest21-21ksoftirqd/109:40:131
28739993320,10cyclictest32530-1kworker/u9:111:45:131
2875099324,20cyclictest27-21ksoftirqd/211:55:142
2873999323,24cyclictest21033-21ssh11:20:141
28739993212,10cyclictest0-21swapper/109:20:131
2873399324,19cyclictest14856-21ssh09:10:140
2875899315,16cyclictest35966irq/58-eth009:50:143
2875099311,18cyclictest4333-21ssh12:05:132
2873999314,22cyclictest29963-21sh11:25:131
2873999311,26cyclictest23151-21ssh10:45:121
2873999311,23cyclictest10878-21sshd07:25:141
28758993014,11cyclictest35966irq/58-eth011:00:133
2873999303,20cyclictest22290-21ssh12:15:151
2873399303,21cyclictest19728-21ssh10:25:140
2873399303,21cyclictest19728-21ssh10:25:130
2873399302,21cyclictest32086-21ssh10:50:140
2875899293,13cyclictest0-21swapper/311:25:263
2875099292,21cyclictest20398-21sh12:13:132
2873999293,16cyclictest21-21ksoftirqd/108:25:121
2873999291,22cyclictest8569-21ssh10:55:131
2873999291,18cyclictest0-21swapper/111:10:131
2875899283,18cyclictest0-21swapper/310:56:143
28758992810,6cyclictest35966irq/58-eth010:00:123
2875099282,19cyclictest27458-21ssh09:35:162
2873999284,19cyclictest201rcuc/112:10:131
2873999282,19cyclictest12029-21ssh11:15:131
2875899277,16cyclictest35966irq/58-eth010:30:113
2875899272,11cyclictest0-21swapper/312:15:483
2875099275,15cyclictest27346irq/40-dwc2_hso08:20:112
2875099273,17cyclictest0-21swapper/212:20:132
2875099271,20cyclictest10643-21ssh10:20:142
28750992711,13cyclictest0-21swapper/208:45:152
2873999272,22cyclictest22422-21ssh11:00:331
2873999272,19cyclictest7837-21sh12:25:141
28739992715,7cyclictest21-21ksoftirqd/111:40:141
2873999271,21cyclictest32077-21ssh10:50:121
28733992720,3cyclictest12-21ksoftirqd/012:25:120
2873399271,19cyclictest16731-21sshd12:30:140
2875899265,10cyclictest0-21swapper/311:05:143
2875899262,8cyclictest0-21swapper/309:45:163
2875899262,10cyclictest0-21swapper/311:12:143
28758992616,6cyclictest35966irq/58-eth012:25:143
2875099263,15cyclictest27346irq/40-dwc2_hso07:30:132
2875099262,18cyclictest0-21swapper/207:55:142
28750992612,6cyclictest21028-21sshd11:20:142
28750992611,12cyclictest0-21swapper/208:25:262
2873999263,19cyclictest201rcuc/111:05:131
2873999263,16cyclictest0-21swapper/109:15:151
2873399263,19cyclictest18849-21ssh11:55:150
2873399261,4cyclictest131rcu_preempt11:35:130
2875899253,15cyclictest35966irq/58-eth010:25:133
2875899253,15cyclictest35966irq/58-eth010:25:133
2875899253,10cyclictest0-21swapper/312:11:143
2875899253,10cyclictest0-21swapper/312:05:143
28758992514,8cyclictest0-21swapper/309:55:173
2875099252,8cyclictest7807-21apt-get12:25:142
28750992513,9cyclictest15361-21ssh09:26:472
28750992513,9cyclictest15361-21ssh09:26:472
28750992513,5cyclictest0-21swapper/208:40:232
2875099251,18cyclictest22256-21apt-get12:15:142
28750992511,10cyclictest15031-21cron11:35:022
28750992510,12cyclictest27111-21irqrtprio11:05:192
2873999259,12cyclictest0-21swapper/110:40:121
2873999252,18cyclictest30834-21ssh09:55:131
2873999251,19cyclictest1550-21ssh10:15:121
28739992510,12cyclictest28721-21cyclictest11:50:141
2873399252,18cyclictest26550-21sshd11:05:140
2875899241,17cyclictest0-21swapper/310:54:133
2875099242,16cyclictest0-21swapper/211:15:142
2873999241,17cyclictest25053-21sshd10:10:141
2873399242,19cyclictest3095-21ssh11:10:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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