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2024-11-23 - 16:58

OSADL QA Farm on Real-time of Mainline Linux

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

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 20 highest latencies:
System rack7slot7s.osadl.org (updated Sat Nov 23, 2024 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30447210086,9sleep10-21swapper/107:05:381
3112629986,9sleep30-21swapper/307:07:133
3120228766,6sleep20-21swapper/207:08:132
3131528364,14sleep00-21swapper/007:09:390
243702260,1sleep217343-21kworker/2:112:01:152
3142999244,8cyclictest39-21ksoftirqd/311:51:593
31429992322,1cyclictest0-21swapper/307:38:463
31429992217,4cyclictest39-21ksoftirqd/309:50:023
3142199220,22cyclictest0-21swapper/111:43:301
3141699217,7cyclictest11866-21perf08:45:000
31416992118,2cyclictest0-21swapper/011:34:350
128572210,1chrt161rcuc/009:26:550
48192200,0chrt0-21swapper/009:20:170
3142599201,18cyclictest12268-21ntp_kernel_pll_07:35:212
3142599200,2cyclictest0-21swapper/212:05:132
3142599200,20cyclictest0-21swapper/211:15:002
3142599200,20cyclictest0-21swapper/208:05:122
3141699200,2cyclictest141rcu_preempt11:59:500
64882190,0sleep00-21swapper/012:10:230
3142999198,2cyclictest39-21ksoftirqd/311:35:283
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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