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2026-04-09 - 12:01

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 rackcslot7s.osadl.org (updated Thu Apr 09, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
367269522420,20sleep013-21ksoftirqd/019:05:170
377763221330,3sleep23776896-21/usr/sbin/munin00:00:172
367934221130,4sleep13056-21PK-Backend19:20:201
367934221130,4sleep13056-21PK-Backend19:20:191
372001221020,3sleep20-21swapper/221:15:212
367226727747,24sleep20-21swapper/219:05:122
367309626640,19sleep30-21swapper/319:05:263
367335426243,14sleep10-21swapper/119:06:041
37122822530,2sleep30-21swapper/320:55:173
37499872450,3sleep13056-21PK-Backend22:40:211
37097312450,8sleep013-21ksoftirqd/020:50:000
367392199413,24cyclictest0-21swapper/222:33:002
367392199413,22cyclictest0-21swapper/221:51:312
367392199388,21cyclictest978-21snmpd19:31:292
367392199374,18cyclictest3722278-21taskset21:24:122
367392199373,20cyclictest0-21swapper/219:28:382
367392199370,19cyclictest3724051-21chrt21:29:402
367392199363,20cyclictest0-21swapper/220:06:042
367392199363,20cyclictest0-21swapper/220:04:002
367392199362,23cyclictest0-21swapper/219:18:562
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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