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2026-06-07 - 00:30

OSADL QA Farm on Real-time of Mainline Linux

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

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot3s.osadl.org (updated Sat Jun 06, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
33275262147107,36sleep30-21swapper/33
349232321240,2sleep00-21swapper/00
377125821220,2sleep00-21swapper/00
339292621050,4sleep0221rcuc/00
332742528466,12sleep20-21swapper/22
332760328356,7sleep00-21swapper/00
332768827963,10sleep10-21swapper/11
332786399251,18cyclictest37467372sleep33
332786399241,13cyclictest0-21swapper/33
3327863992218,2cyclictest0-21swapper/33
332786399221,18cyclictest0-21swapper/33
332786399211,16cyclictest0-21swapper/33
3327863992017,1cyclictest0-21swapper/33
3327863992012,4cyclictest3808997-21turbostat3
332786399201,15cyclictest66950irq/132-enp1s0-TxRx-33
332786399201,15cyclictest0-21swapper/33
3327863992010,6cyclictest3774061-21turbostat3
37222872192,11sleep23722398-21irqstats2
35898592191,6sleep13589899-21munin-run1
35898592191,6sleep13589899-21munin-run1
33366332191,8sleep13338368-21cut1
3327863991916,1cyclictest0-21swapper/33
332786399191,15cyclictest0-21swapper/33
332786399191,15cyclictest0-21swapper/33
332786399191,14cyclictest0-21swapper/33
332786399191,14cyclictest0-21swapper/33
332786399191,14cyclictest0-21swapper/33
332786399191,14cyclictest0-21swapper/33
332786399190,17cyclictest0-21swapper/33
37195682181,3sleep00-21swapper/00
35184102180,2sleep20-21swapper/22
332786399182,10cyclictest3448043-21taskset3
3327863991816,1cyclictest0-21swapper/33
3327863991816,1cyclictest0-21swapper/33
332786399181,5cyclictest0-21swapper/33
3327863991812,3cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,14cyclictest0-21swapper/33
332786399181,13cyclictest3809326-21chrt3
332786399181,13cyclictest0-21swapper/33
332786399181,13cyclictest0-21swapper/33
332786399181,13cyclictest0-21swapper/33
332786399180,15cyclictest0-21swapper/33
332786399180,15cyclictest0-21swapper/33
332786399180,14cyclictest0-21swapper/33
332786399180,14cyclictest0-21swapper/33
36981902171,5sleep13699061-21memory1
35944132171,11sleep03594463-21ntpq0
35707192176,7sleep13327857-21cyclictest1
34813422171,3sleep10-21swapper/11
34675652171,3sleep00-21swapper/00
34588232172,4sleep13458837-21apt-get1
332786399171,3cyclictest0-21swapper/33
3327863991713,2cyclictest0-21swapper/33
332786399171,14cyclictest0-21swapper/33
332786399171,13cyclictest0-21swapper/33
332786399171,13cyclictest0-21swapper/33
332786399171,13cyclictest0-21swapper/33
332786399171,13cyclictest0-21swapper/33
332786399171,13cyclictest0-21swapper/33
332786399171,12cyclictest0-21swapper/33
332786399170,14cyclictest0-21swapper/33
332786399170,14cyclictest0-21swapper/33
332786399170,14cyclictest0-21swapper/33
332786399170,14cyclictest0-21swapper/33
36904542161,4sleep13690512-21ntpq1
36679462161,5sleep03458448-21diskmemload0
34587722163,2sleep2171rcu_preempt2
33670832160,11sleep20-21swapper/22
332786399166,6cyclictest3384161-21taskset3
332786399160,13cyclictest0-21swapper/33
332786399160,13cyclictest0-21swapper/33
332786399160,13cyclictest0-21swapper/33
38263232151,3sleep03458448-21diskmemload0
37622472151,2sleep00-21swapper/00
36134662151,2sleep20-21swapper/22
36131402151,4sleep13458448-21diskmemload1
35533362150,1sleep10-21swapper/11
35530482151,4sleep23553062-21ssh2
35172742151,3sleep03458448-21diskmemload0
34199332151,8sleep03419981-21ntpq0
332786399150,13cyclictest0-21swapper/33
332786399150,12cyclictest0-21swapper/33
332786399150,12cyclictest0-21swapper/33
332786399150,12cyclictest0-21swapper/33
38142792140,2sleep10-21swapper/11
37192432141,8sleep23458448-21diskmemload2
36501342141,10sleep23458448-21diskmemload2
35624212141,2sleep10-21swapper/11
35182482141,2sleep10-21swapper/11
332786399148,3cyclictest34321772sleep33
332786399143,7cyclictest0-21swapper/33
332786399141,1cyclictest0-21swapper/33
3327863991411,1cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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