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2026-07-31 - 07:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 100 highest latencies:
System rack8slot4s.osadl.org (updated Fri Jul 31, 2026 00:44:39)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27673772253175,23sleep40-21swapper/419:09:474
27671802244173,23sleep20-21swapper/219:06:552
27644592238165,22sleep10-21swapper/119:05:011
27672042222182,25sleep60-21swapper/619:07:166
27673512220170,41sleep50-21swapper/519:09:245
27673022218184,22sleep30-21swapper/319:08:413
27673062216178,26sleep70-21swapper/719:08:467
27670832213181,21sleep00-21swapper/019:05:330
276761599290,28cyclictest0-21swapper/021:40:130
2767615992819,8cyclictest2909986-21grep23:10:010
276761599280,27cyclictest0-21swapper/020:35:120
276761599270,26cyclictest0-21swapper/021:00:000
276761599260,25cyclictest2812519-21cron20:25:000
276761599260,25cyclictest0-21swapper/022:25:190
276761599260,25cyclictest0-21swapper/020:00:180
276761599260,25cyclictest0-21swapper/000:30:190
276763399250,24cyclictest3422186-21systemd-journal19:25:017
276762699250,24cyclictest2938269-21awk23:55:184
2767623992521,3cyclictest2777135-21cron19:25:013
2767621992521,4cyclictest2891100-21awk22:35:182
276761599250,24cyclictest0-21swapper/023:40:130
276761599250,24cyclictest0-21swapper/020:05:120
276761599250,24cyclictest0-21swapper/019:35:120
2767633992422,1cyclictest0-21swapper/720:45:117
276763399240,23cyclictest2818881-21apt-get20:35:127
2767629992422,1cyclictest0-21swapper/600:30:126
2767629992419,4cyclictest2839353-21cat21:10:016
276762999240,23cyclictest0-21swapper/620:40:106
276762799240,23cyclictest0-21swapper/523:45:175
276762799240,18cyclictest2804930-21head20:10:135
276762699240,23cyclictest2961889-21ntpq00:35:184
276762699240,0cyclictest0-21swapper/421:35:134
2767623992420,3cyclictest2931106-21runrttasks23:45:113
2767621992423,1cyclictest2907475-21apt-get23:05:142
2767621992421,3cyclictest2839115-21apt-get21:10:032
276762199240,1cyclictest2843856-21ntpq21:15:212
276761599240,23cyclictest0-21swapper/022:45:120
276761599240,23cyclictest0-21swapper/021:00:130
2767633992322,0cyclictest0-21swapper/722:05:037
2767633992321,1cyclictest2815541-21appstreamcli20:30:027
2767633992321,1cyclictest2783462-21apt-get19:35:127
276763399230,22cyclictest2845080-21tr21:20:007
276763399230,22cyclictest2767966-21apt-get19:10:117
276763399230,22cyclictest0-21swapper/720:20:197
276763399230,22cyclictest0-21swapper/700:20:207
276763399230,1cyclictest2794843-21awk19:55:007
276762999230,22cyclictest2871694-21appstreamcli22:05:026
276762999230,22cyclictest0-21swapper/623:55:136
276762999230,22cyclictest0-21swapper/623:05:146
276762999230,22cyclictest0-21swapper/619:40:116
276762999230,22cyclictest0-21swapper/600:35:126
2767627992323,0cyclictest0-21swapper/520:40:115
2767627992322,1cyclictest0-21swapper/521:30:125
2767627992321,1cyclictest2877973-21apt-get22:15:115
276762799230,22cyclictest0-21swapper/521:55:135
276762799230,22cyclictest0-21swapper/519:50:115
276762799230,22cyclictest0-21swapper/500:30:135
2767626992322,1cyclictest0-21swapper/422:20:114
2767626992318,4cyclictest2930676-21ls23:45:004
276762699230,22cyclictest0-21swapper/420:50:124
276762699230,22cyclictest0-21swapper/420:30:124
276762699230,22cyclictest0-21swapper/419:45:114
276762699230,22cyclictest0-21swapper/419:15:144
2767623992320,3cyclictest2769358-21ntpq19:10:183
276762399230,23cyclictest2803673-21munin-run20:10:003
276762399230,22cyclictest0-21swapper/322:15:113
276762399230,22cyclictest0-21swapper/300:10:173
276762399230,0cyclictest0-21swapper/323:05:143
2767621992322,1cyclictest2960613-21apt-get00:35:122
2767621992320,3cyclictest2815510-21sqv20:30:002
276762199230,23cyclictest2770478-21ls19:15:002
276762199230,22cyclictest2786422-21apt-get19:40:102
276762199230,22cyclictest0-21swapper/223:30:132
276762199230,22cyclictest0-21swapper/222:05:032
276762199230,22cyclictest0-21swapper/220:35:122
276762199230,22cyclictest0-21swapper/220:15:122
276762199230,22cyclictest0-21swapper/200:05:142
276762199230,0cyclictest0-21swapper/221:35:032
2767617992321,1cyclictest2821438-21idleruntime-cro20:40:001
2767617992321,1cyclictest0-21swapper/120:55:131
2767617992321,1cyclictest0-21swapper/120:10:121
276761799230,22cyclictest2812958-21apt-get20:25:111
276761799230,22cyclictest0-21swapper/121:55:121
276761799230,22cyclictest0-21swapper/121:05:001
276761799230,22cyclictest0-21swapper/119:15:141
2767615992320,3cyclictest0-21swapper/020:40:160
2767615992320,2cyclictest3422186-21systemd-journal22:10:000
2767615992319,4cyclictest0-21swapper/022:15:180
2767615992317,5cyclictest2954288-21turbostat00:25:000
276761599230,22cyclictest3422186-21systemd-journal20:00:000
276761599230,22cyclictest2865738-21idleruntime-cro21:55:000
276761599230,22cyclictest2777149-21munin-run19:25:010
276761599230,22cyclictest0-21swapper/022:00:000
276761599230,22cyclictest0-21swapper/021:30:120
2767633992222,0cyclictest0-21swapper/722:45:197
2767633992221,1cyclictest2889766-21apt-get22:35:127
2767633992221,1cyclictest0-21swapper/723:45:007
2767633992221,1cyclictest0-21swapper/722:50:117
2767633992221,1cyclictest0-21swapper/721:30:007
2767633992221,1cyclictest0-21swapper/700:10:177
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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