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2025-10-14 - 11:24

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 here to display the system's profile data or here to proceed to next system.
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 rack7slot4s.osadl.org (updated Tue Oct 14, 2025 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3166199596,6cyclictest131rcu_preempt19:50:161
3166199521,7cyclictest0-21swapper/100:35:141
31683994920,21cyclictest25366irq/58-eth021:45:153
31672994530,11cyclictest15285-21apt-get23:15:132
31672994414,24cyclictest0-21swapper/200:30:142
3166199442,8cyclictest0-21swapper/119:45:171
31661994423,13cyclictest629-21Async08:52:161
3166199431,4cyclictest0-21swapper/123:15:131
3165399432,37cyclictest12547-21ssh21:35:130
31672994223,15cyclictest0-21swapper/220:10:162
31672994222,14cyclictest15614-21apt-get23:35:142
3165399425,33cyclictest15617-21ssh23:35:120
3165399423,10cyclictest131rcu_preempt00:25:130
31672994127,9cyclictest6943-21ssh22:50:142
31672994127,9cyclictest6943-21ssh22:50:132
31672994122,16cyclictest20821-21apt-get21:40:122
3168399403,22cyclictest25366irq/58-eth022:25:143
31683994021,12cyclictest0-21swapper/300:30:133
3166199401,2cyclictest0-21swapper/121:40:121
3167299392,29cyclictest26479-21ssh22:00:322
3165399391,25cyclictest14205-21ssh22:15:150
3165399391,25cyclictest14205-21ssh22:15:140
31672993832,3cyclictest12539-21apt-get21:35:132
31672993820,11cyclictest8059-21diskmemload21:50:162
31672993815,16cyclictest0-21swapper/223:30:152
3166199381,4cyclictest16701-21apt-get00:15:131
3165399382,30cyclictest30716-21ssh22:25:130
31672993726,2cyclictest8882-21apt-get00:10:142
3166199371,4cyclictest20016-21ssh21:20:141
3166199371,3cyclictest0-21swapper/120:45:101
3168399362,19cyclictest25366irq/58-eth019:15:143
31672993629,3cyclictest16298-21apt-get23:55:132
31672993622,10cyclictest942-21snmpd19:50:172
3166199361,5cyclictest28468-21ssh00:00:301
31672993518,13cyclictest30736-21ssh22:25:142
3166199352,25cyclictest14649-21ssh22:35:131
3166199352,21cyclictest11799-21ssh21:15:111
3166199351,9cyclictest28236-21kthreadcore20:50:211
3166199351,31cyclictest1712-21timerwakeupswit22:05:281
31653993529,3cyclictest12-21ksoftirqd/019:55:140
3168399342,16cyclictest25366irq/58-eth021:50:153
3167299349,10cyclictest0-21swapper/223:04:542
31672993425,4cyclictest30079-21apt-get22:05:132
31672993415,16cyclictest0-21swapper/223:20:142
3167299341,14cyclictest7065-21ssh23:10:152
31672993410,10cyclictest17743-21sed22:15:262
31672993410,10cyclictest17743-21sed22:15:262
3166199341,8cyclictest8657-21sed23:50:201
3166199341,8cyclictest6145-21fschecks_time22:10:161
3166199341,8cyclictest24341-21acpi00:20:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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