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2025-08-30 - 01:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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 20 highest latencies:
System rack9slot4s (updated Fri Aug 29, 2025 12:59:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
290899911911182,6cyclictest0-21swapper/107:25:131
290899911031081,18cyclictest1072-21apt-get07:35:021
287212564517,32sleep00-21swapper/007:21:490
287472503417,75sleep10-21swapper/107:22:031
2908899221210,6cyclictest1182-21latency_hist07:35:010
2908899119110,6cyclictest0-21swapper/007:25:130
29089996017,7cyclictest22-21ksoftirqd/110:17:231
29089995916,7cyclictest22-21ksoftirqd/110:28:381
29089995916,6cyclictest22-21ksoftirqd/109:47:391
29089995914,6cyclictest22-21ksoftirqd/111:19:261
29089995822,4cyclictest22-21ksoftirqd/111:31:211
29089995822,4cyclictest22-21ksoftirqd/110:03:421
29089995821,5cyclictest22-21ksoftirqd/112:38:391
29089995816,6cyclictest22-21ksoftirqd/110:44:121
29089995814,6cyclictest22-21ksoftirqd/109:32:001
29089995722,5cyclictest22-21ksoftirqd/112:13:101
29089995722,5cyclictest22-21ksoftirqd/109:52:061
29089995720,4cyclictest22-21ksoftirqd/109:58:061
29089995717,6cyclictest22-21ksoftirqd/109:12:331
29089995716,7cyclictest22-21ksoftirqd/110:21:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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