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2026-03-20 - 15:23

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 Fri Mar 20, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
222531921240,2sleep1321rcuc/11
1794287212162,55sleep30-21swapper/33
179422128655,12sleep10-21swapper/11
178972628154,14sleep00-21swapper/00
178954327755,13sleep20-21swapper/22
1794643992522,1cyclictest0-21swapper/33
179464399241,20cyclictest0-21swapper/33
179464399238,12cyclictest0-21swapper/33
179464399232,15cyclictest1952193-21chrt3
1794643992320,1cyclictest0-21swapper/33
1794643992320,1cyclictest0-21swapper/33
1794643992320,1cyclictest0-21swapper/33
179464399231,17cyclictest0-21swapper/33
22910162222,7sleep22291073-21ntpq2
22046062222,9sleep21925440-21diskmemload2
179464399229,1cyclictest0-21swapper/33
1794643992218,2cyclictest0-21swapper/33
1794643992118,2cyclictest0-21swapper/33
1794643992118,1cyclictest0-21swapper/33
1794643992118,1cyclictest0-21swapper/33
1794643992118,1cyclictest0-21swapper/33
1794643992116,2cyclictest0-21swapper/33
20002592201,3sleep10-21swapper/11
1794643992018,1cyclictest0-21swapper/33
1794643992017,1cyclictest0-21swapper/33
179464399201,6cyclictest2057262-21sleep3
1794643992016,2cyclictest0-21swapper/33
1794643992016,2cyclictest0-21swapper/33
1794643992015,2cyclictest0-21swapper/33
179464399201,16cyclictest0-21swapper/33
179464399201,15cyclictest0-21swapper/33
179464399201,15cyclictest0-21swapper/33
1794643992010,6cyclictest1799905-21taskset3
1794643992010,6cyclictest1799905-21taskset3
21445262191,2sleep00-21swapper/00
20356222191,4sleep02035774-21ssh0
20183112198,3sleep2171rcu_preempt2
1794643991916,2cyclictest0-21swapper/33
1794643991916,1cyclictest0-21swapper/33
1794643991916,1cyclictest0-21swapper/33
1794643991915,2cyclictest0-21swapper/33
1794643991915,2cyclictest0-21swapper/33
1794643991914,2cyclictest0-21swapper/33
1794643991912,5cyclictest0-21swapper/33
1794643991912,4cyclictest0-21swapper/33
179464399191,15cyclictest0-21swapper/33
179464399191,14cyclictest0-21swapper/33
179464399190,3cyclictest0-21swapper/33
20017342181,2sleep20-21swapper/22
19858632180,6sleep10-21swapper/11
1794643991815,2cyclictest0-21swapper/33
1794643991815,1cyclictest0-21swapper/33
1794643991814,2cyclictest0-21swapper/33
1794643991814,2cyclictest0-21swapper/33
1794643991814,2cyclictest0-21swapper/33
1794643991814,2cyclictest0-21swapper/33
1794643991814,2cyclictest0-21swapper/33
179464399181,14cyclictest0-21swapper/33
179464399181,14cyclictest0-21swapper/33
179464399180,14cyclictest0-21swapper/33
179464399180,14cyclictest0-21swapper/33
22248862170,11sleep22224899-21apt-get2
21966072171,3sleep00-21swapper/00
21688332171,7sleep11925440-21diskmemload1
21613702171,5sleep11925440-21diskmemload1
21442382171,3sleep20-21swapper/22
21148732171,3sleep00-21swapper/00
20648022171,3sleep00-21swapper/00
19345782171,5sleep01934840-21df0
1794643991714,1cyclictest0-21swapper/33
1794643991714,1cyclictest0-21swapper/33
179464399171,3cyclictest1866103-21taskset3
1794643991713,1cyclictest0-21swapper/33
1794643991711,3cyclictest1834409-21taskset3
179464399171,13cyclictest0-21swapper/33
179464399171,12cyclictest1893697-21chrt3
179464399170,14cyclictest0-21swapper/33
22133282161,3sleep20-21swapper/22
20285092161,3sleep00-21swapper/00
20145902161,11sleep02016158-21ssh0
1794643991614,1cyclictest0-21swapper/33
179464399161,3cyclictest0-21swapper/33
1794643991613,1cyclictest0-21swapper/33
1794643991612,2cyclictest0-21swapper/33
179464399160,13cyclictest0-21swapper/33
22746072151,8sleep11925440-21diskmemload1
22680622151,3sleep20-21swapper/22
22414482151,10sleep22241461-21ssh2
22397012151,4sleep02239712-21ssh0
22054032151,3sleep01925440-21diskmemload0
19521592153,6sleep21952183-21apt-get2
19137022152,7sleep11913735-21ntpq1
179464399153,1cyclictest0-21swapper/33
1794643991513,1cyclictest0-21swapper/33
1794643991512,2cyclictest0-21swapper/33
1794643991512,2cyclictest0-21swapper/33
1794643991512,1cyclictest0-21swapper/33
22582772141,2sleep20-21swapper/22
22280742141,7sleep02228874-21memory0
22232442141,3sleep20-21swapper/22
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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