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2026-05-25 - 07:26

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 Mon May 25, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1875731994134,5cyclictest2214572-21ntpq00:30:232
1875726994137,3cyclictest1859714-21kworker/u8:1+flush-259:021:05:171
1875726994037,2cyclictest1859714-21kworker/u8:1+flush-259:020:40:211
1875726993933,4cyclictest2006308-21apt-get21:15:121
1875731993833,4cyclictest1948205-21ntpq20:15:202
1875731993734,2cyclictest2072928-21kworker/u8:0+flush-259:022:45:002
1875736993632,3cyclictest1959500-21kworker/u8:0+flush-259:020:55:213
1875736993618,13cyclictest2032286-21diskstats21:40:123
1875736993529,4cyclictest2194773-21latency_hist00:15:013
1875736993430,3cyclictest2020670-21kworker/u8:2+flush-259:021:50:223
1875726993326,5cyclictest1979276-21ntpq20:45:211
1875719993327,4cyclictest335557-21systemd-journal23:55:150
1875719993326,4cyclictest1984396-21ntpq20:50:200
1875726993229,2cyclictest2042233-21kworker/u8:0+flush-259:022:00:261
1875726993229,2cyclictest1859714-21kworker/u8:1+flush-259:020:20:001
1875726993226,4cyclictest335557-21systemd-journal19:59:161
1875726993127,3cyclictest1859714-21kworker/u8:1+flush-259:021:40:201
1875726993125,5cyclictest1876039-21cat19:10:011
1875719993127,3cyclictest2072928-21kworker/u8:0+flush-259:022:20:160
1875719993126,3cyclictest2110270-21kworker/u8:1+flush-259:023:05:170
1875719993126,3cyclictest2084254-21apt-get22:30:110
1875731993025,4cyclictest2195039-21apt-get00:15:122
1875726993025,3cyclictest335557-21systemd-journal20:54:161
1875719993026,2cyclictest0-21swapper/022:55:170
1875736992925,3cyclictest2141412-21apt-get23:21:163
1875726992925,3cyclictest2031878-21kworker/u8:3+flush-259:022:35:261
1875731992823,4cyclictest335557-21systemd-journal00:22:262
1875726992824,3cyclictest2174272-21kworker/u8:4+events_unbound00:10:221
1875726992823,3cyclictest2105322-21/usr/sbin/munin22:50:221
1875726992823,3cyclictest1859714-21kworker/u8:1+events_unbound20:10:121
1875726992820,5cyclictest509-21rs:main1
1875719992824,3cyclictest2084639-21kworker/u8:2+flush-259:022:35:250
1875736992721,4cyclictest2094557-21/usr/sbin/munin22:40:133
1875726992724,2cyclictest2078880-21kworker/u8:1+events_unbound22:30:001
1875726992724,2cyclictest2072928-21kworker/u8:0+events_unbound22:40:171
1875726992720,5cyclictest2042221-21latency_hist21:50:001
1875736992622,3cyclictest1859714-21kworker/u8:1+flush-259:020:10:163
1875736992621,3cyclictest1901716-21gpgv19:35:003
1875731992622,3cyclictest1891429-21kworker/u8:2+flush-259:020:05:172
187573199260,24cyclictest1-21systemd00:15:002
1875726992622,3cyclictest2084639-21kworker/u8:2+flush-259:023:25:251
1875726992622,3cyclictest1937960-21kworker/u8:3+flush-259:020:24:471
1875726992620,4cyclictest2210265-21latency_hist00:30:001
187571999261,23cyclictest1-21systemd20:25:000
1875736992520,3cyclictest1881348-21apt-get19:15:113
1875736992519,4cyclictest2026733-21latency_hist21:35:013
1875731992520,3cyclictest2052519-21latency_hist22:00:002
1875726992521,3cyclictest1990732-21kworker/u8:3+events_unbound21:00:221
1875726992520,3cyclictest2121278-21apt-get23:05:091
1875726992518,5cyclictest2047606-21/usr/sbin/munin21:55:141
1875726992518,4cyclictest509-21rs:main1
1875719992519,4cyclictest2215395-21latency_hist00:35:010
1875736992417,6cyclictest0-21swapper/322:15:003
1875726992420,3cyclictest1859714-21kworker/u8:1+flush-259:019:45:231
1875726992417,5cyclictest335557-21systemd-journal22:25:001
1875719992421,2cyclictest1896553-21kworker/u8:4+flush-259:019:35:170
187571999241,21cyclictest1-21systemd00:01:260
1875736992317,4cyclictest1974970-21latency_hist20:45:013
1875736992312,10cyclictest1907536-21/usr/sbin/munin19:40:143
1875731992320,2cyclictest1891390-21idleruntime-cro19:25:002
1875731992316,5cyclictest2016431-21latency_hist21:25:002
1875726992320,2cyclictest1896553-21kworker/u8:4+flush-259:019:50:201
1875726992319,3cyclictest1959500-21kworker/u8:0+events_unbound20:30:251
1875726992319,3cyclictest1859714-21kworker/u8:1+events_unbound21:12:181
1875726992318,4cyclictest2174272-21kworker/u8:4+flush-259:000:05:281
1875726992318,3cyclictest2110270-21kworker/u8:1+events_unbound23:00:231
1875726992316,4cyclictest1969778-21latency_hist20:40:011
1875736992217,4cyclictest2120584-21apt-get23:05:003
1875736992217,3cyclictest335557-21systemd-journal23:49:163
1875731992215,5cyclictest2189583-21latency_hist00:10:012
1875726992218,3cyclictest2110506-21apt-get22:55:111
1875726992218,3cyclictest2084639-21kworker/u8:2+events_unbound23:14:181
1875726992218,3cyclictest2020670-21kworker/u8:2+events_unbound21:25:231
1875726992218,3cyclictest1891429-21kworker/u8:2+flush-259:019:40:211
1875726992217,3cyclictest2110270-21kworker/u8:1+flush-259:023:15:201
1875726992216,4cyclictest1886487-21/usr/sbin/munin19:20:141
1875719992219,2cyclictest2031878-21kworker/u8:3+events_unbound22:25:190
1875719992218,3cyclictest1896553-21kworker/u8:4+events_unbound19:50:190
1875719992217,3cyclictest1881315-21kworker/u8:3+flush-259:019:25:250
1875719992216,4cyclictest2199955-21latency_hist00:20:010
1875736992117,3cyclictest2072928-21kworker/u8:0+flush-259:022:50:263
1875736992117,3cyclictest1859714-21kworker/u8:1+flush-259:020:25:163
1875731992118,2cyclictest1985548-21kworker/u8:2+flush-259:021:10:212
1875731992116,3cyclictest1902352-21/usr/sbin/munin19:35:152
1875731992115,5cyclictest1859714-21kworker/u8:1+flush-259:020:30:172
1875731992113,5cyclictest1990492-21latency_hist21:00:002
1875726992119,1cyclictest2157484-21kworker/u8:1+events_unbound23:56:151
1875726992118,2cyclictest2072928-21kworker/u8:0+flush-259:022:32:321
1875726992118,2cyclictest1859714-21kworker/u8:1+events_unbound21:35:181
1875726992118,2cyclictest1859714-21kworker/u8:1+events_unbound21:35:171
1875726992117,3cyclictest2199980-21kworker/u8:0+events_unbound00:20:141
1875726992117,3cyclictest1859714-21kworker/u8:1+flush-259:022:09:471
1875726992116,3cyclictest335557-21systemd-journal00:40:001
1875726992115,4cyclictest335557-21systemd-journal19:34:161
1875719992118,2cyclictest2120623-21apt-key23:04:590
1875719992117,3cyclictest2215665-21apt-get00:35:130
1875719992117,3cyclictest2031878-21kworker/u8:3+flush-259:022:40:160
1875719992117,3cyclictest1964906-21apt-get20:35:130
187573699206,12cyclictest513-21gdbus00:30:003
1875736992014,4cyclictest1990734-21/usr/sbin/munin21:00:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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