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2026-07-19 - 13:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot4s.osadl.org (updated Sun Jul 19, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1714625995148,2cyclictest75-21kswapd023:15:020
1714634994741,4cyclictest335557-21systemd-journal23:35:003
1714629994437,4cyclictest1850298-21latency_hist21:20:001
1714634994136,3cyclictest2016808-21apt-get00:00:123
1714629994037,2cyclictest75-21kswapd023:15:021
1714634993932,5cyclictest1802566-21latency_hist20:35:013
1714634993827,9cyclictest1694703-21kworker/u8:0+flush-259:019:10:013
1714625993833,3cyclictest1735274-21kworker/u8:1+flush-259:020:15:010
1714634993630,4cyclictest335557-21systemd-journal21:18:253
1714625993531,3cyclictest1969536-21gpgv23:14:590
1714625993527,6cyclictest2000146-21ntpq23:40:220
1714632993428,4cyclictest335557-21systemd-journal19:50:012
1714634993228,3cyclictest1735274-21kworker/u8:1+flush-259:019:55:003
1714632993125,4cyclictest1865801-21latency_hist21:35:002
1714629993126,4cyclictest335557-21systemd-journal20:44:241
1714632993025,3cyclictest1756019-21kworker/u8:0+flush-259:020:15:112
1714629993024,4cyclictest1787112-21latency_hist20:20:011
1714625993023,5cyclictest1995878-21latency_hist23:40:000
1714632992917,10cyclictest1777045-21apt-get20:10:142
1714625992926,2cyclictest1855510-21kworker/u8:0+events_unbound22:25:010
1714625992926,2cyclictest1829918-21kworker/u8:2+flush-259:021:25:220
1714625992925,3cyclictest1969713-21kworker/u8:3+flush-259:023:30:270
1714632992811,3cyclictest1948426-21idleruntime-cro22:55:002
1714629992822,4cyclictest2011642-21apt-get23:55:121
1714625992821,5cyclictest1796508-21ntpq20:25:210
1714629992721,4cyclictest2037636-21latency_hist00:20:011
1714625992722,3cyclictest1756019-21kworker/u8:0+flush-259:020:00:260
1714634992621,3cyclictest1792259-21kworker/u8:3+events_unbound20:45:013
1714634992521,3cyclictest1818147-21gpgv20:50:003
1714634992520,3cyclictest1835106-21apt-get21:05:123
1714632992521,3cyclictest75-21kswapd023:15:022
1714632992521,3cyclictest335557-21systemd-journal22:27:562
1714629992521,3cyclictest1725143-21kworker/u8:4+flush-259:019:44:591
1714625992519,4cyclictest1739525-21ntpq19:30:210
1714625992518,5cyclictest2047072-21ntpq00:25:230
1714632992422,1cyclictest1839997-21kworker/u8:3+flush-259:021:15:002
1714632992420,3cyclictest1766682-21/usr/sbin/munin20:00:232
1714629992419,3cyclictest1735275-21kworker/u8:3+flush-259:020:00:171
1714625992420,3cyclictest507-21in:imuxsock20:20:000
1714634992319,3cyclictest1735274-21kworker/u8:1+flush-259:020:25:013
1714634992317,4cyclictest1943283-21latency_hist22:50:013
1714632992319,3cyclictest1855510-21kworker/u8:0+flush-259:021:40:102
1714629992317,4cyclictest1776784-21latency_hist20:10:011
1714625992318,3cyclictest1938152-21kworker/u8:0+flush-259:023:00:000
1714634992218,3cyclictest1985558-21kworker/u8:4+flush-259:023:50:193
1714634992217,3cyclictest2021760-21kworker/u8:0+flush-259:000:05:223
1714634992216,4cyclictest1927563-21kworker/u8:1+flush-259:023:40:183
171463299228,5cyclictest335557-21systemd-journal21:01:242
1714632992218,3cyclictest1812942-21kworker/u8:0+flush-259:020:45:242
1714632992216,4cyclictest2048194-21/usr/sbin/munin00:30:142
1714629992218,3cyclictest1724656-21kworker/u8:2+flush-259:019:25:001
1714629992218,3cyclictest1724656-21kworker/u8:2+flush-259:019:25:001
1714625992219,2cyclictest1876167-21kworker/u8:2+events_unbound22:05:170
1714625992217,4cyclictest1735275-21kworker/u8:3+events_unbound19:45:000
1714625992216,4cyclictest335557-21systemd-journal00:02:250
1714634992118,1cyclictest0-21swapper/320:59:593
1714634992116,3cyclictest1969713-21kworker/u8:3+flush-259:023:25:263
1714634992116,3cyclictest1928039-21apt-get22:35:123
1714634992113,6cyclictest2053285-21cp00:35:003
171463299218,2cyclictest2016536-21sh00:00:002
1714629992116,3cyclictest1958961-21gpgv23:05:011
1714625992117,2cyclictest1829918-21kworker/u8:2+flush-259:021:30:240
1714625992116,4cyclictest1855510-21kworker/u8:0+events_unbound22:10:180
1714634992018,1cyclictest1907028-21kworker/u8:3+flush-259:022:22:553
1714634992017,2cyclictest1901881-21cron22:10:003
1714634992016,3cyclictest1876167-21kworker/u8:2+events_unbound00:20:203
1714634992012,5cyclictest1806946-21ntpq20:35:233
1714632992016,3cyclictest2043012-21kworker/u8:3+flush-259:000:25:172
1714632992014,4cyclictest1980268-21latency_hist23:25:012
1714629992018,1cyclictest1735274-21kworker/u8:1+events_unbound19:35:181
1714625992017,2cyclictest1876167-21kworker/u8:2+flush-259:023:30:000
1714625992016,3cyclictest1876167-21kworker/u8:2+flush-259:023:00:190
1714625992016,3cyclictest1665920-21kworker/u8:1+flush-259:019:15:000
1714625992015,3cyclictest1824241-21base6420:55:000
1714634991914,3cyclictest2053178-21apt-get00:35:033
1714634991913,4cyclictest1970019-21base6423:15:003
1714634991913,4cyclictest1855510-21kworker/u8:0+flush-259:022:00:213
1714634991912,5cyclictest1891581-21latency_hist22:00:013
171463299199,9cyclictest1740694-21/usr/sbin/munin19:35:202
1714632991916,2cyclictest1912229-21idleruntime-cro22:20:002
1714632991915,3cyclictest1886421-21sh21:55:002
1714632991914,4cyclictest335557-21systemd-journal00:20:012
1714632991914,4cyclictest2006469-21apt-get23:50:142
1714629991916,2cyclictest2047948-21idleruntime-cro00:30:001
1714625991916,2cyclictest509-21rs:main0
1714625991913,4cyclictest1730356-21apt-get19:25:130
1714625991912,5cyclictest1911306-21ntpq22:15:180
1714634991814,3cyclictest1735275-21kworker/u8:3+flush-259:019:45:153
171463299185,4cyclictest1855732-21apt-get21:25:132
1714632991815,2cyclictest1942412-21ntp_kernel_pll_22:45:232
1714632991813,4cyclictest335557-21systemd-journal22:35:002
1714632991813,4cyclictest335557-21systemd-journal21:10:002
1714632991812,4cyclictest1870975-21latency_hist21:40:002
171462999184,3cyclictest1932075-21ld22:35:211
171462999183,6cyclictest1791467-21proc_pri20:20:241
171462999183,4cyclictest490-21dbus-daemon00:05:011
1714629991815,2cyclictest1917685-21apt-get22:25:131
1714625991814,3cyclictest1927563-21kworker/u8:1+flush-259:022:45:000
1714625991811,5cyclictest335557-21systemd-journal23:25:000
1714625991811,5cyclictest2031132-21ntpq00:10:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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