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2026-03-20 - 01:14

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 Thu Mar 19, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
790875997466,7cyclictest75-21kswapd011:11:240
790885995552,2cyclictest75-21kswapd011:11:233
790883994440,3cyclictest75-21kswapd011:11:232
790883994035,3cyclictest966705-21kworker/u8:0+events_unbound10:20:162
790883993731,4cyclictest1033908-21/usr/sbin/munin11:05:132
790885993631,3cyclictest972064-21/usr/sbin/munin10:05:133
790883993630,5cyclictest1122261-21/usr/sbin/munin12:30:132
790875993623,3cyclictest915028-21apt-get09:10:100
790878993025,3cyclictest790867-21kworker/u8:0+flush-259:007:20:151
790883992923,4cyclictest252-21systemd-journal10:15:002
790878992923,4cyclictest1096378-21apt-get12:05:091
790883992823,3cyclictest1039041-21kworker/u8:1+events_unbound11:30:152
790875992824,3cyclictest1096137-21kworker/u8:3+flush-259:012:04:590
790875992722,4cyclictest966705-21kworker/u8:0+flush-259:011:00:170
790878992621,4cyclictest1064703-21apt-get11:35:011
790875992621,3cyclictest961121-21kworker/u8:2+flush-259:010:35:150
790885992520,4cyclictest1096137-21kworker/u8:3+flush-259:012:15:153
790885992519,4cyclictest1085792-21latency_hist11:55:023
790883992521,3cyclictest1096137-21kworker/u8:3+flush-259:012:30:002
790878992520,3cyclictest796256-21apt-get07:15:121
790885992420,3cyclictest1054373-21kworker/u8:0+flush-259:011:35:003
790885992419,3cyclictest252-21systemd-journal11:18:453
790883992419,3cyclictest868528-21kworker/u8:3+flush-259:008:55:182
790883992418,4cyclictest935920-21cat09:30:012
790883992416,5cyclictest795991-21latency_hist07:15:002
790885992319,3cyclictest868528-21kworker/u8:3+flush-259:008:50:153
790885992316,5cyclictest252-21systemd-journal12:35:003
790878992317,4cyclictest919929-21kworker/u8:1+flush-259:009:45:181
790885992217,3cyclictest801396-21apt-get07:20:113
790883992219,2cyclictest1075482-21kworker/u8:2+events_unbound12:00:132
790883992216,4cyclictest873876-21/usr/sbin/munin08:30:132
790885992116,4cyclictest1075882-21diskstats11:45:123
790885992115,4cyclictest252-21systemd-journal11:40:013
790885992114,5cyclictest1054354-21latency_hist11:25:013
790883992118,2cyclictest1049181-21sh11:20:002
790883992117,3cyclictest966705-21kworker/u8:0+flush-259:010:20:002
790883992115,4cyclictest956418-21latency_hist09:50:012
790883992114,5cyclictest805469-21ntpq07:20:212
790883992114,5cyclictest1018190-21latency_hist10:50:002
790878992118,2cyclictest832-21runrttasks08:05:011
790878992118,2cyclictest832-21runrttasks08:05:001
790878992115,4cyclictest1111651-21latency_hist12:20:001
790885992016,3cyclictest1096137-21kworker/u8:3+flush-259:012:24:593
790883992017,2cyclictest966705-21kworker/u8:0+flush-259:011:00:152
790878992013,6cyclictest981240-21ntp_kernel_pll_10:10:201
790885991915,3cyclictest919929-21kworker/u8:1+flush-259:009:55:163
790885991912,5cyclictest904486-21latency_hist09:00:023
790883991915,3cyclictest842812-21kworker/u8:0+flush-259:008:10:002
790883991914,3cyclictest868528-21kworker/u8:3+flush-259:009:25:242
79087899191,17cyclictest0-21swapper/111:15:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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