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2025-11-20 - 20:01

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 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 20 highest latencies:
System rack9slot4s (updated Thu Nov 20, 2025 12:59:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
279889912661236,23cyclictest28153-21wget07:25:111
279889912451214,26cyclictest32431-21apt-get07:35:011
275742465421,31sleep10-21swapper/107:21:201
275032465369,29sleep00-21swapper/007:20:360
2798799256232,21cyclictest0-21swapper/007:25:100
2798799224198,20cyclictest32549-21latency_hist07:35:020
2338521040,6sleep0111rcuc/010:36:310
274702850,5sleep02798799cyclictest09:34:280
256642750,9sleep02798799cyclictest11:12:540
147052490,3sleep00-21swapper/012:42:030
27987994326,6cyclictest30205-21iostat10:10:220
27987994225,6cyclictest29352-21sort10:10:010
27987994225,6cyclictest11226-21memory09:50:400
27987994225,5cyclictest21146-21sed08:30:020
27987994224,13cyclictest24424-21ssh10:05:000
243742420,4sleep124352-21ssh11:45:201
97482410,17sleep041ktimersoftd/010:22:410
27987994125,6cyclictest30852-21ssh10:45:090
27987994125,6cyclictest11945-21diskstats10:25:150
27987994124,6cyclictest3980-21sort10:50:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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