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2026-05-14 - 00:31

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Default latency plot of shadow in rack #a, slot #8

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 rackaslot8s.osadl.org (updated Wed May 13, 2026 12:45:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
31281221898,96sleep10-21swapper/107:09:271
2962121660,3sleep20-21swapper/207:05:142
2748021650,1sleep30-21swapper/310:04:363
389321400,3sleep30-21swapper/309:46:093
310352140104,25sleep30-21swapper/307:06:163
294202139101,26sleep00-21swapper/007:05:050
20042590,1sleep20-21swapper/209:20:522
20042590,1sleep20-21swapper/209:20:522
152892590,2sleep315285-21dpkg12:20:003
193702580,2sleep20-21swapper/210:45:322
203562550,1sleep30-21swapper/310:23:013
281082540,1sleep20-21swapper/210:28:512
216772530,2sleep10-21swapper/109:35:241
186162520,3sleep331595-21cyclictest11:10:053
6842510,1sleep00-21swapper/010:55:490
6502490,1sleep10-21swapper/110:32:021
73162480,3sleep334-21ksoftirqd/312:37:333
314752480,1sleep20-21swapper/210:30:272
277502480,2sleep00-21swapper/011:16:010
225362480,1sleep30-21swapper/309:35:543
319092470,1sleep30-21swapper/309:43:293
213892440,2chrt0-21swapper/211:11:212
51312430,2chrt0-21swapper/111:24:041
155512400,1sleep10-21swapper/110:19:581
199302350,1chrt0-21swapper/010:46:060
113152330,2sleep00-21swapper/011:28:320
80482300,14sleep018342-21diskmemload11:01:280
321762300,2sleep00-21swapper/010:07:330
196692290,1chrt0-21swapper/211:35:002
3159899279,16cyclictest22-21ksoftirqd/110:58:171
134562270,2sleep10-21swapper/108:55:231
87472260,3sleep122-21ksoftirqd/111:50:211
3160099261,24cyclictest0-21swapper/307:12:043
3159899263,16cyclictest18772-21ssh09:10:121
31597992618,6cyclictest2492-21ssh10:33:520
257652260,2sleep10-21swapper/109:15:141
31600992512,7cyclictest18342-21diskmemload11:20:123
3159899250,24cyclictest0-21swapper/107:11:461
3159799250,24cyclictest0-21swapper/007:11:530
31600992417,5cyclictest4588-21sed08:35:213
31600992414,7cyclictest17358-21ntp_states09:05:183
3159999241,1cyclictest0-21swapper/207:11:442
3159899248,11cyclictest211rcuc/109:25:171
3159899243,15cyclictest6527-21ssh11:25:111
31598992417,4cyclictest31270-21ssh11:43:211
31597992418,4cyclictest12-21ksoftirqd/008:00:000
31597992414,7cyclictest12530-21df07:40:140
31599992313,7cyclictest20694-21df09:35:142
31598992312,7cyclictest52850irq/140-enp3s0-10:40:111
31598992311,7cyclictest52850irq/140-enp3s0-11:00:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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