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2026-06-08 - 01:37

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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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 50 highest latencies:
System rackeslot4s.osadl.org (updated Sun Jun 07, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
976559995044,4cyclictest335557-21systemd-journal07:15:013
976549994338,4cyclictest1314834-21gpgv12:35:010
976559994237,3cyclictest997586-21latency_hist07:30:013
976549994035,3cyclictest1070208-21kworker/u8:2+flush-259:009:25:010
976559993933,4cyclictest1034023-21latency_hist08:05:003
976551993933,4cyclictest1190510-21apt-get10:35:001
976549993935,3cyclictest971400-21kworker/u8:1+flush-259:007:40:010
976549993935,3cyclictest1257982-21kworker/u8:5+flush-259:012:10:210
976549993935,3cyclictest1070208-21kworker/u8:2+flush-259:009:40:220
976551993732,3cyclictest1232187-21kworker/u8:0+flush-259:011:30:001
976549993734,2cyclictest987732-21kworker/u8:2+flush-259:007:30:240
976549993731,4cyclictest1216922-21/usr/sbin/munin11:00:130
976551993631,4cyclictest1100193-21ntpq09:05:211
976549993633,2cyclictest1070208-21kworker/u8:2+flush-259:008:50:250
976549993633,2cyclictest1070208-21kworker/u8:2+flush-259:008:50:240
976551993531,2cyclictest1191207-21apt-get10:35:121
976549993532,2cyclictest971400-21kworker/u8:1+flush-259:007:30:000
976549993531,3cyclictest1190152-21kworker/u8:2+events_unbound10:35:250
976559993431,2cyclictest1070208-21kworker/u8:2+flush-259:010:00:163
976559993428,4cyclictest335557-21systemd-journal08:51:373
976559993428,4cyclictest335557-21systemd-journal08:51:363
976549993430,3cyclictest1257982-21kworker/u8:5+flush-259:011:40:220
976559993328,4cyclictest1002944-21gpgv07:35:003
976554993329,3cyclictest1070208-21kworker/u8:2+flush-259:010:10:202
976549993330,2cyclictest1070208-21kworker/u8:2+flush-259:010:15:200
976559993228,3cyclictest1049700-21kworker/u8:3+flush-259:008:35:253
976554993226,4cyclictest335557-21systemd-journal09:20:012
976549993229,2cyclictest1201262-21kworker/u8:0+flush-259:010:50:230
976554993125,4cyclictest1018584-21latency_hist07:50:002
976551993125,4cyclictest335557-21systemd-journal11:00:061
976549993128,2cyclictest1044325-21kworker/u8:1+events_unbound09:10:200
976549993127,3cyclictest1257982-21kworker/u8:5+flush-259:012:10:000
976559993024,4cyclictest335557-21systemd-journal09:07:353
976551993022,5cyclictest1294083-21latency_hist12:15:021
976549993027,2cyclictest1180353-21kworker/u8:1+events_unbound10:30:000
976549993027,2cyclictest1122411-21kworker/u8:3+flush-259:009:40:010
976549993026,3cyclictest1294107-21kworker/u8:0+flush-259:012:15:180
976549993026,3cyclictest1116817-21apt-get09:25:100
976549993025,3cyclictest1315405-21apt-get12:35:130
976549993023,5cyclictest1241574-21ntpq11:20:220
976549993023,5cyclictest1241574-21ntpq11:20:220
976549993023,5cyclictest1069270-21ntpq08:35:190
976559992926,2cyclictest1070208-21kworker/u8:2+flush-259:009:40:263
976559992926,2cyclictest1013447-21kworker/u8:0+flush-259:008:05:223
976554992926,2cyclictest1070208-21kworker/u8:2+flush-259:009:50:212
976549992927,2cyclictest1122411-21kworker/u8:3+flush-259:011:00:000
976559992822,4cyclictest1303502-21ntpq12:20:203
976559992822,4cyclictest1132136-21ntpq09:35:233
976551992822,4cyclictest335557-21systemd-journal10:05:011
976554992721,4cyclictest1191369-21diskstats10:35:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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