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2026-05-19 - 04:59

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 Tue May 19, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2487584212451,68sleep30-21swapper/33
248750528768,12sleep10-21swapper/11
248775028064,10sleep20-21swapper/22
248770027858,14sleep00-21swapper/00
29736822241,3sleep02973693-21ssh0
248799799241,20cyclictest0-21swapper/33
26259922230,2sleep00-21swapper/00
2487997992319,2cyclictest0-21swapper/33
248799799221,17cyclictest27883412sleep33
29566282211,2sleep00-21swapper/00
248799799211,16cyclictest2839085-21taskset3
25856372201,15sleep22585662-21basename2
248799799204,13cyclictest2838294-21taskset3
248799799203,14cyclictest66950irq/132-enp1s0-TxRx-33
248799799201,15cyclictest66950irq/132-enp1s0-TxRx-33
248799799201,15cyclictest66950irq/132-enp1s0-TxRx-33
248799799201,15cyclictest0-21swapper/33
248799799201,15cyclictest0-21swapper/33
248799799201,14cyclictest0-21swapper/33
28799492191,9sleep22879960-21ssh2
25747582191,6sleep22574804-21ntpq2
248799799198,8cyclictest2500666-21turbostat3
2487997991916,1cyclictest0-21swapper/33
2487997991916,1cyclictest0-21swapper/33
248799799191,15cyclictest0-21swapper/33
248799799191,15cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
248799799191,14cyclictest0-21swapper/33
2487997991910,6cyclictest2548837-21chrt3
248799799190,2cyclictest0-21swapper/33
28713382180,2sleep00-21swapper/00
28635202181,3sleep20-21swapper/22
248799799183,12cyclictest2554290-21taskset3
248799799182,12cyclictest2618610-21turbostat3
248799799181,5cyclictest0-21swapper/33
2487997991812,3cyclictest0-21swapper/33
248799799181,14cyclictest2625888-21taskset3
248799799181,14cyclictest0-21swapper/33
248799799181,14cyclictest0-21swapper/33
248799799181,14cyclictest0-21swapper/33
248799799181,14cyclictest0-21swapper/33
248799799181,14cyclictest0-21swapper/33
248799799181,14cyclictest0-21swapper/33
248799799181,13cyclictest0-21swapper/33
248799799181,13cyclictest0-21swapper/33
248799799181,13cyclictest0-21swapper/33
248799799181,13cyclictest0-21swapper/33
248799799180,14cyclictest0-21swapper/33
29662002171,3sleep20-21swapper/22
29404412172,4sleep02940467-21apt-get0
28866682171,2sleep22886669-21sh2
28023702171,4sleep12618594-21diskmemload1
26850632171,2sleep00-21swapper/00
26739402171,5sleep22673992-21ntpq2
26613942177,7sleep10-21swapper/11
25588512171,5sleep02558907-21ntp_states0
248799799177,6cyclictest2575787-21turbostat3
2487997991711,4cyclictest0-21swapper/33
248799799171,13cyclictest0-21swapper/33
248799799171,13cyclictest0-21swapper/33
248799799171,13cyclictest0-21swapper/33
248799799171,13cyclictest0-21swapper/33
248799799171,11cyclictest2528236-21taskset3
248799799170,15cyclictest0-21swapper/33
248799799170,14cyclictest0-21swapper/33
248799799170,13cyclictest0-21swapper/33
248799799170,13cyclictest0-21swapper/33
28618522161,2sleep10-21swapper/11
27522312161,4sleep12618594-21diskmemload1
27010822161,10sleep02618594-21diskmemload0
26995252161,4sleep12699588-21ssh1
26694142161,5sleep02669495-21munin-run0
26606472161,3sleep20-21swapper/22
26506142161,3sleep10-21swapper/11
248799799163,11cyclictest0-21swapper/33
248799799161,13cyclictest0-21swapper/33
248799799161,13cyclictest0-21swapper/33
248799799160,14cyclictest0-21swapper/33
248799799160,13cyclictest0-21swapper/33
248799799160,13cyclictest0-21swapper/33
248799799160,13cyclictest0-21swapper/33
248799799160,13cyclictest0-21swapper/33
248799799160,12cyclictest0-21swapper/33
29210822151,3sleep22618594-21diskmemload2
28978892151,2sleep20-21swapper/22
28217432151,2sleep20-21swapper/22
28029932151,3sleep22618594-21diskmemload2
27910772151,9sleep12792332-21memory1
27212582151,10sleep12722669-21cut1
27110992151,2sleep10-21swapper/11
26520842151,3sleep22618594-21diskmemload2
2487997991511,2cyclictest0-21swapper/33
248799799150,12cyclictest0-21swapper/33
248799799150,12cyclictest0-21swapper/33
29315772141,9sleep12931600-21munin-run1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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