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2026-07-08 - 10:13

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 Wed Jul 08, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3474446212163,54sleep30-21swapper/33
347448028452,12sleep20-21swapper/22
347453728156,19sleep00-21swapper/00
347460328062,12sleep10-21swapper/11
3474939993026,1cyclictest0-21swapper/33
38081452231,2sleep2171rcu_preempt2
347493999232,15cyclictest3694596-21chrt3
3474939992311,8cyclictest3568459-21taskset3
3474939992118,1cyclictest0-21swapper/33
3474939992118,1cyclictest0-21swapper/33
347493999211,16cyclictest0-21swapper/33
347493999211,16cyclictest0-21swapper/33
347493999211,16cyclictest0-21swapper/33
347493999211,16cyclictest0-21swapper/33
347493999210,17cyclictest0-21swapper/33
38931822201,8sleep13602799-21diskmemload1
36692542201,13sleep03669299-21munin-run0
347493999203,13cyclictest0-21swapper/33
3474939992017,1cyclictest0-21swapper/33
3474939992016,2cyclictest0-21swapper/33
347493999201,15cyclictest0-21swapper/33
37599982191,14sleep03602799-21diskmemload0
36118852191,11sleep13612011-21irqstats1
347493999191,15cyclictest0-21swapper/33
347493999191,15cyclictest0-21swapper/33
347493999191,15cyclictest0-21swapper/33
347493999191,14cyclictest0-21swapper/33
347493999191,14cyclictest0-21swapper/33
347493999191,14cyclictest0-21swapper/33
347493999191,14cyclictest0-21swapper/33
3474939991910,5cyclictest0-21swapper/33
347493999190,5cyclictest37430172sleep33
347493999190,15cyclictest0-21swapper/33
347493999190,15cyclictest0-21swapper/33
39182572181,2sleep20-21swapper/22
38343172181,3sleep20-21swapper/22
36241592181,5sleep03624423-21sed0
347493999181,5cyclictest0-21swapper/33
3474939991812,3cyclictest0-21swapper/33
347493999181,14cyclictest0-21swapper/33
347493999181,14cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999181,13cyclictest0-21swapper/33
347493999180,16cyclictest0-21swapper/33
347493999180,14cyclictest0-21swapper/33
38671732171,3sleep00-21swapper/00
38671732171,3sleep00-21swapper/00
36847612171,3sleep00-21swapper/00
36668302171,2sleep10-21swapper/11
347493999171,4cyclictest0-21swapper/33
3474939991711,3cyclictest3555187-21chrt3
347493999171,13cyclictest0-21swapper/33
347493999171,13cyclictest0-21swapper/33
347493999171,13cyclictest0-21swapper/33
347493999171,13cyclictest0-21swapper/33
3474939991710,4cyclictest0-21swapper/33
347493999170,14cyclictest0-21swapper/33
347493999170,14cyclictest0-21swapper/33
347493999170,13cyclictest3586911-21taskset3
347493999170,13cyclictest0-21swapper/33
39359442165,6sleep03602799-21diskmemload0
38068842161,11sleep03807038-21sh0
37758042169,3sleep13602799-21diskmemload1
37741972161,5sleep23602799-21diskmemload2
36605222161,2sleep20-21swapper/22
35086442160,2sleep00-21swapper/00
35086442160,2sleep00-21swapper/00
347493999161,3cyclictest0-21swapper/33
347493999161,11cyclictest0-21swapper/33
347493999160,13cyclictest0-21swapper/33
347493999160,12cyclictest0-21swapper/33
347493999160,12cyclictest0-21swapper/33
39270012151,3sleep03602799-21diskmemload0
39215882151,8sleep13921723-21diskstats1
38524942153,6sleep13852508-21apt-get1
38516432151,2sleep20-21swapper/22
38088732150,1sleep10-21swapper/11
37832672151,10sleep23783281-21ssh2
37186892151,2sleep00-21swapper/00
36085122150,2sleep00-21swapper/00
354532121510,2sleep30-21swapper/33
35402262150,2sleep0151ktimers/00
347493999156,6cyclictest3538878-21taskset3
347493999154,7cyclictest0-21swapper/33
3474939991513,1cyclictest0-21swapper/33
347493999151,11cyclictest3529612-21taskset3
347493999150,13cyclictest0-21swapper/33
347493999150,12cyclictest0-21swapper/33
347493999150,12cyclictest0-21swapper/33
39193842141,8sleep03602799-21diskmemload0
37507302144,2sleep1171rcu_preempt1
37269312141,2sleep10-21swapper/11
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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