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2025-04-03 - 16:11

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 50 highest latencies:
System rack7slot4s.osadl.org (updated Thu Apr 03, 2025 12:45:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22533996417,36cyclictest27-21ksoftirqd/210:15:142
22533996410,43cyclictest0-21swapper/209:55:152
2253399452,25cyclictest28821-21ssh10:50:132
22510994517,24cyclictest0-21swapper/008:40:120
22544994319,17cyclictest0-21swapper/309:22:323
22544994319,17cyclictest0-21swapper/309:22:313
2254499420,25cyclictest25866irq/58-eth012:10:093
2254499420,25cyclictest25866irq/58-eth012:10:083
2253399419,24cyclictest0-21swapper/207:45:122
2253399414,12cyclictest22498-21cyclictest07:55:152
2251099412,16cyclictest18531-21sendmail-msp12:00:140
22533994013,21cyclictest0-21swapper/212:30:082
22533994013,21cyclictest0-21swapper/212:30:082
22533994013,17cyclictest27-21ksoftirqd/211:35:142
2251099402,32cyclictest29870-21sendmail-msp11:40:140
2254499393,25cyclictest25866irq/58-eth010:10:093
2253399392,18cyclictest7701-21cat10:30:322
2253399392,18cyclictest7701-21cat10:30:322
2252299391,36cyclictest13831-21sendmail-msp09:20:141
2252299391,36cyclictest13831-21sendmail-msp09:20:141
22544993829,7cyclictest0-21swapper/311:50:133
2254499382,21cyclictest25866irq/58-eth011:10:093
22533993827,8cyclictest22046irq/40-fe98000008:00:142
2253399382,29cyclictest19833-21ssh09:22:322
2253399382,29cyclictest19833-21ssh09:22:312
2253399382,28cyclictest12942-21ssh11:26:322
2252299383,23cyclictest6405-21sendmail-msp09:40:121
22510993814,19cyclictest31244-21sendmail-msp10:00:140
22544993718,9cyclictest0-21swapper/307:10:123
2253399372,28cyclictest29800-21ssh09:32:312
2253399372,27cyclictest4636-21cat09:10:322
2252299372,31cyclictest18119-21sendmail-msp10:40:131
2252299361,24cyclictest7691-21sh11:50:131
2253399354,21cyclictest22146irq/40-dwc2_hso08:50:102
2253399353,21cyclictest25242-21sendmail-msp08:20:142
22533993515,5cyclictest0-21swapper/207:30:192
2252299353,22cyclictest32077-21sendmail-msp07:20:141
2253399344,12cyclictest6950-21ssh09:15:122
2253399343,12cyclictest9763-21ssh10:10:082
2251099332,24cyclictest4528-21sendmail-msp11:20:130
2253399323,23cyclictest18531-21sendmail-msp12:00:162
2253399322,14cyclictest18149-21ssh11:03:322
2253399316,15cyclictest543-21ssh12:35:122
2253399312,21cyclictest1443-21ntp_192.168.11411:40:322
2252299312,23cyclictest24399-21sendmail-msp10:20:321
2251099313,20cyclictest11535-21sendmail-msp11:00:130
2251099312,21cyclictest1097-21/usr/sbin/munin10:50:310
2254499303,19cyclictest25866irq/58-eth007:30:203
22533993011,11cyclictest0-21swapper/209:50:092
2252299302,20cyclictest11535-21sendmail-msp11:00:321
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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