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2026-03-19 - 12:16

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 Thu Mar 19, 2026 00:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
12530992623,2cyclictest32020-21ssh21:34:181
1253899250,24cyclictest331rcuc/321:20:473
1253899250,24cyclictest0-21swapper/322:02:453
1253899250,24cyclictest0-21swapper/321:34:183
12533992523,1cyclictest0-21swapper/222:35:012
12530992525,0cyclictest6522-21diskmemload21:46:211
12530992522,2cyclictest29687-21ssh22:02:451
1252599250,24cyclictest6522-21diskmemload22:29:500
1252599250,24cyclictest6340-21ssh21:41:240
12538992423,1cyclictest6522-21diskmemload22:54:053
12538992422,1cyclictest0-21swapper/323:39:233
1253899240,23cyclictest6522-21diskmemload23:10:213
1253899240,23cyclictest0-21swapper/322:41:053
1253899240,0cyclictest6522-21diskmemload22:12:123
12533992423,1cyclictest30289-21ssh22:03:492
12533992422,1cyclictest23982-21ssh21:27:212
1253399241,0cyclictest271rcuc/223:29:432
1253399240,23cyclictest15903-21apt-get22:22:212
1253399240,23cyclictest1391-21ssh23:41:492
1253399240,23cyclictest10393-21ssh23:17:512
1253399240,23cyclictest0-21swapper/222:50:452
1253399240,0cyclictest6522-21diskmemload23:59:502
1253099240,24cyclictest0-21swapper/121:58:281
1253099240,24cyclictest0-21swapper/121:40:491
1253099240,24cyclictest0-21swapper/100:33:521
1253099240,21cyclictest0-21swapper/121:25:381
1253099240,1cyclictest6110-21ssh23:45:331
1253099240,1cyclictest23140-21sh22:59:291
1253099240,0cyclictest6522-21diskmemload23:44:291
12525992423,1cyclictest18691-21ssh00:28:280
12525992422,2cyclictest13331-21ssh23:22:060
12525992421,2cyclictest14018-21rm22:51:370
1252599240,2cyclictest7708-21ssh23:16:320
1252599240,24cyclictest6522-21diskmemload21:59:500
1252599240,23cyclictest17608-21ssh21:20:340
1252599240,23cyclictest0-21swapper/021:51:580
1252599240,0cyclictest6522-21diskmemload21:17:490
1252599240,0cyclictest6522-21diskmemload00:31:430
1252599240,0cyclictest0-21swapper/022:05:530
12538992323,0cyclictest0-21swapper/322:06:373
12538992323,0cyclictest0-21swapper/321:41:313
12538992323,0cyclictest0-21swapper/321:26:313
12538992323,0cyclictest0-21swapper/300:25:133
12538992322,1cyclictest0-21swapper/322:59:323
12538992321,1cyclictest0-21swapper/323:26:173
12538992321,1cyclictest0-21swapper/322:39:403
12538992321,1cyclictest0-21swapper/321:54:063
12538992321,1cyclictest0-21swapper/321:48:573
12538992321,1cyclictest0-21swapper/300:32:233
12538992321,1cyclictest0-21swapper/300:10:333
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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