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2026-01-08 - 13:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack3slot6s.osadl.org (updated Thu Jan 08, 2026 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1685421370,0sleep10-21swapper/108:15:141
23234212296,20sleep10-21swapper/107:07:561
23163211997,17sleep20-21swapper/207:07:012
23119211897,16sleep00-21swapper/007:06:270
232312117106,6sleep30-21swapper/307:07:543
2969821060,1sleep129696-21/usr/sbin/munin10:50:001
207002780,0sleep20-21swapper/211:16:142
124402720,1sleep1221ktimersoftd/111:43:561
295602700,0sleep30-21swapper/312:40:023
216282700,0sleep00-21swapper/010:04:490
2342399234,17cyclictest0-21swapper/211:42:052
2342199210,19cyclictest0-21swapper/007:25:120
2342399202,2cyclictest0-21swapper/209:40:042
23423992017,2cyclictest30036-21kworker/u8:208:59:042
23423992017,2cyclictest20513-21kworker/u8:210:08:042
23423992016,2cyclictest18712-21kworker/u8:211:33:042
23423992016,2cyclictest0-21swapper/209:20:102
2342199200,2cyclictest0-21swapper/009:20:100
23424991916,2cyclictest26312-21kworker/u8:111:25:043
23423991916,2cyclictest981-21kworker/u8:009:57:042
23423991916,2cyclictest9201-21kworker/u8:208:06:042
23423991916,2cyclictest5864-21kworker/u8:212:15:042
23423991916,2cyclictest18058-21kworker/u8:208:36:042
23423991916,2cyclictest16041-21kworker/u8:108:33:042
23423991916,2cyclictest14542-21kworker/u8:110:23:042
23423991916,2cyclictest13867-21kworker/u8:008:14:042
23423991916,2cyclictest11981-21kworker/u8:209:16:042
2342399191,2cyclictest0-21swapper/210:55:042
2342399190,18cyclictest0-21swapper/211:54:052
2342399190,18cyclictest0-21swapper/211:54:052
2342399190,17cyclictest0-21swapper/210:44:042
2342399190,17cyclictest0-21swapper/209:51:042
193802190,1sleep10-21swapper/109:24:501
23424991815,2cyclictest7631-21kworker/u8:010:25:043
23424991815,2cyclictest6566-21kworker/u8:111:47:043
23424991815,2cyclictest32734-21kworker/u8:009:26:043
23424991815,2cyclictest17886-21kworker/u8:109:35:043
23424991815,2cyclictest14542-21kworker/u8:110:20:043
2342399182,2cyclictest0-21swapper/212:13:032
23423991815,2cyclictest30036-21kworker/u8:209:04:042
23423991815,2cyclictest30036-21kworker/u8:209:04:042
23423991815,2cyclictest18637-21kworker/u8:212:31:042
23423991815,2cyclictest18058-21kworker/u8:208:20:042
23423991815,2cyclictest16041-21kworker/u8:108:44:042
23423991815,2cyclictest15029-21kworker/u8:107:16:042
2342399180,2cyclictest0-21swapper/211:39:042
2342399180,2cyclictest0-21swapper/211:05:052
2342399180,2cyclictest0-21swapper/209:07:042
23424991714,2cyclictest7631-21kworker/u8:010:57:033
23424991714,2cyclictest32734-21kworker/u8:009:12:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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