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2026-05-21 - 16:25

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 Thu May 21, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1092693994238,3cyclictest1196909-21kworker/u8:1+flush-259:009:14:593
1092685993935,3cyclictest211rcuc/009:15:000
1092688993835,2cyclictest1082522-21kworker/u8:1+events_unbound07:20:001
1092689993731,4cyclictest1181649-21/usr/sbin/munin08:35:142
1092689993531,3cyclictest1305964-21kworker/u8:3+flush-259:011:35:002
1092689993528,5cyclictest1123949-21latency_hist07:40:002
1092688993228,3cyclictest1378901-21kworker/u8:0+flush-259:011:50:001
1092688993228,3cyclictest1358217-21kworker/u8:2+flush-259:011:45:001
1092685993227,4cyclictest1404039-21ntpq12:05:190
1092693993128,2cyclictest1305964-21kworker/u8:3+events_unbound12:00:183
1092688993127,3cyclictest1186595-21latency_hist08:40:011
1092685993127,3cyclictest1389241-21apt-get11:55:110
1092685993126,3cyclictest1347945-21apt-get11:15:120
1092693993027,2cyclictest1207201-21kworker/u8:2+flush-259:009:29:593
1092689993026,3cyclictest1113217-21apt-get07:30:002
1092689993026,3cyclictest1113217-21apt-get07:30:002
1092689993025,4cyclictest1378674-21latency_hist11:45:002
1092685993026,3cyclictest1196909-21kworker/u8:1+flush-259:010:55:150
1092688992925,2cyclictest1108109-21kworker/u8:2+flush-259:007:45:131
1092685992924,3cyclictest509-21rs:main0
1092689992825,2cyclictest1233110-21kworker/u8:0+flush-259:009:39:592
1092688992725,1cyclictest1227934-21grep09:20:001
1092688992724,2cyclictest1233110-21kworker/u8:0+flush-259:009:45:171
1092688992723,3cyclictest1134823-21base6407:50:021
1092693992622,3cyclictest509-21rs:main3
1092693992620,4cyclictest1321883-21diskstats10:50:143
1092688992622,3cyclictest1305966-21kworker/u8:4+flush-259:011:00:111
1092688992622,3cyclictest1186860-21apt-get08:40:101
1092689992522,2cyclictest1196909-21kworker/u8:1+flush-259:010:50:002
1092689992522,2cyclictest1196909-21kworker/u8:1+flush-259:010:15:012
1092688992522,2cyclictest1357869-21kworker/u8:1+events_unbound11:25:011
1092688992522,2cyclictest1233110-21kworker/u8:0+events_unbound10:00:181
1092688992522,2cyclictest1129112-21kworker/u8:0+flush-259:008:20:101
1092688992520,4cyclictest1191999-21/usr/sbin/munin08:45:251
1092688992519,4cyclictest1279646-21latency_hist10:10:011
1092693992419,4cyclictest1336955-21apt-get11:05:003
1092689992420,3cyclictest1039568-21kworker/u8:3+events_unbound07:15:002
1092688992421,2cyclictest1347697-21systemd-run11:15:001
1092688992420,3cyclictest1363462-21apt-get11:30:101
1092688992420,2cyclictest1-21systemd10:15:011
1092688992418,4cyclictest1290447-21gpgv10:20:001
1092689992320,2cyclictest1284871-21kworker/u8:2+flush-259:010:35:002
1092689992319,3cyclictest335557-21systemd-journal09:50:302
1092689992319,3cyclictest1129112-21kworker/u8:0+flush-259:008:25:242
1092688992320,2cyclictest1196909-21kworker/u8:1+flush-259:010:40:101
1092688992319,3cyclictest1305964-21kworker/u8:3+flush-259:012:15:001
1092688992319,3cyclictest1108109-21kworker/u8:2+events_unbound07:35:111
1092688992318,3cyclictest1196909-21kworker/u8:1+events_unbound08:50:171
1092688992316,5cyclictest1305076-21ntpq10:30:211
1092685992319,3cyclictest1196909-21kworker/u8:1+flush-259:010:35:250
1092693992219,2cyclictest1378901-21kworker/u8:0+flush-259:011:55:123
1092689992219,2cyclictest1233110-21kworker/u8:0+flush-259:009:25:152
1092689992218,3cyclictest1394827-21/usr/sbin/munin12:00:202
1092689992217,3cyclictest1394158-21latency_hist12:00:002
1092685992219,2cyclictest1389596-21kworker/u8:4+flush-259:012:20:120
1092685992219,2cyclictest1305964-21kworker/u8:3+flush-259:011:10:000
1092685992218,3cyclictest1108109-21kworker/u8:2+flush-259:007:55:000
1092685992216,4cyclictest335557-21systemd-journal09:24:590
1092693992118,2cyclictest1196909-21kworker/u8:1+flush-259:009:05:223
1092689992118,2cyclictest1196909-21kworker/u8:1+flush-259:010:35:172
1092689992117,3cyclictest335557-21systemd-journal10:25:232
1092689992117,3cyclictest1196909-21kworker/u8:1+flush-259:009:00:162
1092688992118,2cyclictest1108109-21kworker/u8:2+flush-259:007:55:171
1092688992117,2cyclictest1306208-21apt-get10:35:121
1092688992116,4cyclictest1389596-21kworker/u8:4+flush-259:012:09:591
1092693992017,2cyclictest1207176-21sh09:00:003
1092693992017,2cyclictest1129112-21kworker/u8:0+events_unbound08:40:203
1092693992015,3cyclictest1113746-21base6407:30:003
1092689992017,2cyclictest1196909-21kworker/u8:1+flush-259:010:55:142
1092688992018,1cyclictest1305964-21kworker/u8:3+events_unbound10:45:111
1092688992016,3cyclictest1305964-21kworker/u8:3+events_unbound11:40:001
1092688992015,4cyclictest1181409-21latency_hist08:35:021
1092688992014,4cyclictest335557-21systemd-journal09:55:001
1092685992017,2cyclictest1108109-21kworker/u8:2+flush-259:007:30:130
1092685992016,3cyclictest335557-21systemd-journal08:30:190
1092685992015,3cyclictest1284009-21ntpq10:10:200
1092685992014,4cyclictest1269310-21latency_hist10:00:000
1092693991916,2cyclictest1165052-21kworker/u8:2+events_unbound08:50:023
1092689991912,5cyclictest1103374-21diskstats07:20:142
1092688991915,3cyclictest1196909-21kworker/u8:1+events_unbound09:30:191
1092688991915,3cyclictest1171091-21kworker/u8:3+flush-259:009:40:211
1092688991914,3cyclictest1171091-21kworker/u8:3+flush-259:009:10:161
1092688991914,3cyclictest1108109-21kworker/u8:2+events_unbound08:00:131
1092688991913,4cyclictest1394796-21cp12:00:011
1092688991912,6cyclictest1389596-21kworker/u8:4+flush-259:012:30:261
1092685991916,2cyclictest0-21swapper/011:05:010
1092685991914,4cyclictest1377750-21ntpq11:40:200
1092685991913,4cyclictest1409220-21ntpq12:10:220
1092693991815,2cyclictest1082522-21kworker/u8:1+flush-259:007:25:163
1092693991815,2cyclictest1082522-21kworker/u8:1+flush-259:007:25:163
1092693991814,3cyclictest500-21systemd-logind08:20:003
1092693991814,3cyclictest1363183-21sh11:30:003
1092693991814,3cyclictest1233110-21kworker/u8:0+flush-259:009:50:173
1092693991814,3cyclictest1171091-21kworker/u8:3+flush-259:009:15:173
1092688991814,3cyclictest1358217-21kworker/u8:2+flush-259:011:50:221
1092688991814,3cyclictest1196909-21kworker/u8:1+flush-259:010:20:141
1092688991814,3cyclictest1129112-21kworker/u8:0+flush-259:008:15:161
1092688991813,3cyclictest1290671-21kworker/u8:0+flush-259:010:30:011
1092685991815,2cyclictest1165052-21kworker/u8:2+flush-259:008:40:000
1092685991813,4cyclictest1285115-21apt-get10:15:120
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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