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2026-08-21 - 18:44

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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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 highest latencies:
System rack3slot3s.osadl.org (updated Fri Aug 21, 2026 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3204735211961,54sleep30-21swapper/33
320500629057,12sleep10-21swapper/11
320499728464,11sleep20-21swapper/22
320485627857,14sleep00-21swapper/00
320523399231,16cyclictest0-21swapper/33
320523399230,21cyclictest0-21swapper/33
36518612220,2sleep23608115-21gzip2
320523399223,7cyclictest0-21swapper/33
3205233992211,7cyclictest35720582sleep33
34640652210,9sleep23464483-21cut2
3205233992112,5cyclictest0-21swapper/33
320523399211,17cyclictest0-21swapper/33
320523399211,16cyclictest0-21swapper/33
320523399211,16cyclictest0-21swapper/33
320523399211,16cyclictest0-21swapper/33
320523399211,16cyclictest0-21swapper/33
320523399211,16cyclictest0-21swapper/33
320523399211,15cyclictest0-21swapper/33
320523399210,19cyclictest0-21swapper/33
34372252201,15sleep23437239-21ssh2
320523399209,7cyclictest3512523-21taskset3
3205233992012,5cyclictest0-21swapper/33
320523399201,16cyclictest0-21swapper/33
320523399201,16cyclictest0-21swapper/33
320523399201,15cyclictest3332765-21sleep3
320523399201,15cyclictest0-21swapper/33
320523399201,15cyclictest0-21swapper/33
320523399201,15cyclictest0-21swapper/33
320523399201,15cyclictest0-21swapper/33
36990952191,6sleep13332763-21diskmemload1
320523399193,10cyclictest3322589-21taskset3
3205233991914,3cyclictest66950irq/132-enp1s0-TxRx-33
3205233991912,5cyclictest0-21swapper/33
320523399191,15cyclictest3557101-21taskset3
320523399191,14cyclictest0-21swapper/33
320523399191,14cyclictest0-21swapper/33
320523399191,14cyclictest0-21swapper/33
320523399191,14cyclictest0-21swapper/33
320523399191,14cyclictest0-21swapper/33
3205233991910,5cyclictest0-21swapper/33
36628182186,8sleep00-21swapper/00
36399962181,13sleep13641512-21kthreadcore1
36104802181,4sleep23610490-21ssh2
34562912182,5sleep13457753-21cut1
33752592181,12sleep13332763-21diskmemload1
320523399182,10cyclictest3585317-21taskset3
320523399181,14cyclictest3529448-21taskset3
320523399181,14cyclictest0-21swapper/33
320523399181,14cyclictest0-21swapper/33
320523399181,13cyclictest0-21swapper/33
320523399180,15cyclictest0-21swapper/33
36262982171,3sleep10-21swapper/11
33935472171,3sleep10-21swapper/11
320523399177,6cyclictest3243927-21turbostat3
320523399171,3cyclictest0-21swapper/33
320523399171,13cyclictest0-21swapper/33
320523399171,13cyclictest0-21swapper/33
320523399171,12cyclictest0-21swapper/33
320523399170,14cyclictest0-21swapper/33
320523399170,14cyclictest0-21swapper/33
36515742161,4sleep03332763-21diskmemload0
36449892161,10sleep03608113-21tar0
34012412161,7sleep23332395-21kworker/u16:1-rpciod2
32602172161,10sleep23259609-21sendmail-msp2
320523399163,1cyclictest0-21swapper/33
320523399161,13cyclictest0-21swapper/33
320523399161,12cyclictest0-21swapper/33
320523399161,12cyclictest0-21swapper/33
3205233991610,4cyclictest0-21swapper/33
320523399160,4cyclictest0-21swapper/33
320523399160,13cyclictest0-21swapper/33
320523399160,13cyclictest0-21swapper/33
320523399160,13cyclictest0-21swapper/33
320523399160,12cyclictest0-21swapper/33
36347842151,9sleep13332763-21diskmemload1
35661712150,11sleep13566185-21ssh1
35469522151,3sleep23332763-21diskmemload2
35406482150,3sleep00-21swapper/00
35406482150,3sleep00-21swapper/00
34690082151,3sleep10-21swapper/11
34543172155,5sleep13454575-21wc1
3205233991513,1cyclictest0-21swapper/33
3205233991511,2cyclictest0-21swapper/33
320523399150,13cyclictest0-21swapper/33
320523399150,12cyclictest0-21swapper/33
320523399150,12cyclictest0-21swapper/33
320523399150,12cyclictest0-21swapper/33
320523399150,12cyclictest0-21swapper/33
320523399150,12cyclictest0-21swapper/33
36980592140,3sleep03698070-21ssh0
36794322141,9sleep03679443-21ssh0
36781612141,6sleep13608113-21tar1
36180242141,3sleep03332763-21diskmemload0
36154812141,9sleep13615615-21/usr/sbin/munin1
35750712141,7sleep23332763-21diskmemload2
35229692141,9sleep03522983-21ssh0
34787932141,8sleep03332763-21diskmemload0
320523399142,8cyclictest0-21swapper/33
3205233991410,2cyclictest0-21swapper/33
320523399140,12cyclictest0-21swapper/33
320523399140,11cyclictest0-21swapper/33
36639642131,6sleep13608115-21gzip1
36514352131,5sleep13608115-21gzip1
36449612131,6sleep23608115-21gzip2
36361392131,5sleep23608115-21gzip2
36355962131,6sleep03332763-21diskmemload0
36205442131,9sleep03608113-21tar0
36087842131,8sleep13332763-21diskmemload1
35818282130,2sleep03581843-21ssh0
35757672131,8sleep03575778-21ssh0
35645862131,7sleep03332763-21diskmemload0
35576792131,8sleep13332763-21diskmemload1
35456772131,6sleep03545759-21ntp_states0
35380452131,7sleep13538057-21ssh1
35380452131,7sleep13538057-21ssh1
35224792131,7sleep13332763-21diskmemload1
34347582131,8sleep13332763-21diskmemload1
34206302131,6sleep13421866-21cut1
34099112131,2sleep13409925-21ssh1
33505282132,4sleep20-21swapper/22
33013122130,1sleep00-21swapper/00
32752082131,7sleep13275275-21munin-run1
32402662131,7sleep03241801-21cut0
32179132131,8sleep00-21swapper/00
32168292131,8sleep23216980-21ls2
32068702131,8sleep23208561-21cut2
320523399131,8cyclictest3269664-21chrt3
36948662121,6sleep23695016-21ssh2
36897532120,8sleep23608115-21gzip2
36886512121,7sleep03688664-21sh0
36878002120,1sleep10-21swapper/11
36784382120,2sleep23608115-21gzip2
36198562121,5sleep23608115-21gzip2
36166682121,4sleep20-21swapper/22
36024792121,5sleep03602510-21ssh0
35933402122,5sleep23593338-21sendmail-msp2
35905442121,5sleep20-21swapper/22
35651132121,3sleep20-21swapper/22
35553062121,7sleep03555318-21rm0
35301362120,2sleep10-21swapper/11
35032012121,5sleep10-21swapper/11
34808032121,8sleep00-21swapper/00
34502942121,7sleep23450438-21switchtime2
34087712121,7sleep03408783-21rm0
33560302121,7sleep13356042-21sh1
33390862121,6sleep03339098-21ssh0
33381222121,6sleep13332763-21diskmemload1
33173362121,5sleep13317592-21df1
33173362121,5sleep13317592-21df1
32234912121,6sleep03223700-21hddtemp_smartct0
32176022121,8sleep03217679-21systemd-run0
36703412111,5sleep23608115-21gzip2
36688472111,6sleep03663965-21/usr/sbin/munin0
35935842110,7sleep13593598-21ssh1
35849542111,5sleep10-21swapper/11
35844632111,6sleep13332763-21diskmemload1
35676932110,2sleep10-21swapper/11
35575412110,5sleep20-21swapper/22
35136792110,1sleep10-21swapper/11
35054762111,6sleep23505491-21ssh2
34971672111,3sleep10-21swapper/11
34869562111,3sleep13486966-21rm1
34373212112,4sleep13437340-21apt-get1
34218672111,6sleep23423391-21kthreadcore2
34163992111,5sleep13332763-21diskmemload1
34074652110,1sleep20-21swapper/22
33674942111,5sleep03367570-21sqv0
33663152110,2sleep10-21swapper/11
33565282111,6sleep03356539-21ssh0
33485752111,4sleep03332763-21diskmemload0
33392662112,4sleep23332763-21diskmemload2
33108622111,5sleep13310920-21ntp_states1
33016362111,4sleep23301401-21sendmail-msp2
32601192111,7sleep13260214-21tune2fs1
32342482111,6sleep23235837-21tr2
36609062100,1sleep10-21swapper/11
35941882101,4sleep03594296-21irqstats0
35825732101,2sleep20-21swapper/22
35488722100,1sleep10-21swapper/11
35314132101,3sleep00-21swapper/00
35242102101,4sleep23523901-21sendmail-msp2
35154362100,1sleep20-21swapper/22
35147692100,1sleep20-21swapper/22
35039072101,3sleep00-21swapper/00
34949912100,2sleep00-21swapper/00
34851332103,3sleep23485363-21timerwakeupswit2
34796872101,5sleep23332763-21diskmemload2
34789102101,2sleep10-21swapper/11
34613832101,4sleep23332763-21diskmemload2
34600772103,3sleep03460092-21ssh0
34535942100,1sleep00-21swapper/00
34185622101,4sleep23418575-21ssh2
34183912100,2sleep00-21swapper/00
33907692101,2sleep00-21swapper/00
33819982101,4sleep03332763-21diskmemload0
33765562101,3sleep10-21swapper/11
33764732101,2sleep20-21swapper/22
33743452101,3sleep23332763-21diskmemload2
33669602101,3sleep23332763-21diskmemload2
33499872101,3sleep20-21swapper/22
33496712101,3sleep10-21swapper/11
33283882103,3sleep13328426-21kthreadcore1
33226532101,4sleep03322856-21diskstats0
33069202101,4sleep23307176-21df2
33047882101,5sleep13305554-21expr1
32794832100,6sleep00-21swapper/00
32700002101,4sleep21-21systemd2
32493842101,3sleep00-21swapper/00
32339052100,2sleep00-21swapper/00
32097872101,4sleep03210005-21users0
3661127290,4sleep23608115-21gzip2
3590720290,1sleep00-21swapper/00
3538003291,2sleep23332763-21diskmemload2
3538003291,2sleep23332763-21diskmemload2
3507506291,4sleep03508732-21cut0
3489344291,4sleep23489355-21ssh2
3471463290,1sleep00-21swapper/00
3443067291,3sleep03332763-21diskmemload0
3436308291,3sleep2421rcuc/22
3428613291,4sleep03428627-21ssh0
3425394290,1sleep00-21swapper/00
3400186290,5sleep03400197-21ssh0
3399129291,3sleep13332763-21diskmemload1
3367877291,3sleep03367522-21apt-get0
3325615290,1sleep10-21swapper/11
3322562291,3sleep23322340-21sendmail-msp2
3312705290,5sleep23314272-21kthreadcore2
3312595291,4sleep13312704-21cut1
3259543291,4sleep03259623-21munin-run0
3244175290,4sleep23244194-21apt-get2
3233609291,2sleep10-21swapper/11
3228902291,5sleep00-21swapper/00
3223222291,4sleep23223356-21tr2
3392220281,3sleep23392235-21ssh2
3320129281,3sleep23321191-21/usr/sbin/munin2
3320129281,3sleep23321191-21/usr/sbin/munin2
3316948280,4sleep00-21swapper/00
3296980281,3sleep13298389-21kthreadcore1
3286555280,4sleep13288032-21tr1
3271170281,3sleep23272807-21kthreadcore2
3249406281,3sleep13249595-21cstates1
3244465281,3sleep10-21swapper/11
3243744280,2sleep20-21swapper/22
3223200280,2sleep10-21swapper/11
3221106281,3sleep13217669-21sendmail-msp1
3205984281,3sleep13206869-21cat1
3327821270,2sleep03327840-21apt-get0
3301443271,2sleep00-21swapper/00
3293271271,2sleep20-21swapper/22
3291186270,2sleep00-21swapper/00
3290684270,1sleep20-21swapper/22
3285973270,2sleep00-21swapper/00
3285676270,1sleep00-21swapper/00
3284618271,2sleep10-21swapper/11
3281293271,3sleep20-21swapper/22
3275791270,3sleep20-21swapper/22
3265061270,2sleep10-21swapper/11
3254629270,2sleep10-21swapper/11
3245916270,3sleep03247669-21cut0
3238670271,2sleep13205224-21cyclictest1
3217926271,2sleep20-21swapper/22
3217468272,4sleep1331ktimers/11
3329238260,2sleep20-21swapper/22
3317300260,2sleep00-21swapper/00
3317300260,2sleep00-21swapper/00
3311560260,1sleep00-21swapper/00
3298390261,2sleep20-21swapper/22
3276540261,2sleep10-21swapper/11
3274644260,2sleep00-21swapper/00
3265060260,1sleep00-21swapper/00
3259833261,2sleep00-21swapper/00
3254622260,3sleep23254623-21apt-get2
3253967260,1sleep20-21swapper/22
3233050260,1sleep20-21swapper/22
3295215250,1sleep10-21swapper/11
3228419250,1sleep10-21swapper/11
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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