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2026-04-03 - 19:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Fri Apr 03, 2026 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30257992625,1cyclictest28-21ksoftirqd/208:45:012
3025199260,25cyclictest23588-21diskmemload09:14:241
3026199250,24cyclictest0-21swapper/309:58:453
30257992520,4cyclictest23588-21diskmemload10:07:392
3025799250,1cyclictest13112-21ssh09:30:312
30251992525,0cyclictest0-21swapper/111:44:151
3025199250,24cyclictest12146-21apt-get08:48:391
3024699252,1cyclictest62550irq/127-eno112:24:570
3024699250,24cyclictest6792-21apt-get10:28:410
30261992424,0cyclictest0-21swapper/311:35:513
3026199240,23cyclictest8182-21ssh11:00:213
3026199240,23cyclictest23588-21diskmemload10:05:153
3026199240,23cyclictest22136-21kworker/u8:010:25:323
3026199240,23cyclictest12662-21apt-get12:08:413
3026199240,23cyclictest0-21swapper/311:11:083
3026199240,23cyclictest0-21swapper/310:45:303
3026199240,23cyclictest0-21swapper/310:31:483
30257992422,1cyclictest0-21swapper/211:18:432
3025799240,23cyclictest1938-21sendmail-msp09:20:012
3025799240,23cyclictest0-21swapper/212:33:162
3025799240,23cyclictest0-21swapper/210:56:542
30251992423,1cyclictest27600-21ssh09:44:231
3025199240,23cyclictest23588-21diskmemload12:31:311
3025199240,23cyclictest23588-21diskmemload11:01:241
3025199240,23cyclictest0-21swapper/112:13:161
3025199240,23cyclictest0-21swapper/110:45:331
3025199240,23cyclictest0-21swapper/108:53:401
3024699240,24cyclictest23588-21diskmemload09:52:200
3024699240,24cyclictest0-21swapper/012:00:200
3024699240,24cyclictest0-21swapper/011:26:160
3024699240,23cyclictest21948-21perf08:00:000
3024699240,23cyclictest15100-21ssh11:08:130
3024699240,23cyclictest0-21swapper/010:31:420
3024699240,0cyclictest23588-21diskmemload09:15:250
30261992323,0cyclictest23588-21diskmemload09:20:043
30261992323,0cyclictest0-21swapper/310:51:203
30261992323,0cyclictest0-21swapper/309:38:083
30261992322,1cyclictest23588-21diskmemload11:05:423
30261992321,1cyclictest0-21swapper/311:15:123
30261992321,1cyclictest0-21swapper/310:36:433
30261992321,1cyclictest0-21swapper/309:19:233
3026199230,23cyclictest23588-21diskmemload12:27:153
3026199230,23cyclictest23588-21diskmemload09:25:133
3026199230,23cyclictest0-21swapper/312:02:213
3026199230,23cyclictest0-21swapper/311:30:123
3026199230,23cyclictest0-21swapper/310:01:573
3026199230,23cyclictest0-21swapper/309:50:443
3026199230,22cyclictest9557-21chrt12:36:253
3026199230,22cyclictest313-21systemd-journal11:50:013
3026199230,22cyclictest30512-21ssh09:48:403
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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