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2026-09-24 - 01:06

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Wed Sep 23, 2026 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111131521860,4sleep3481ktimers/308:59:033
1003962996656,7cyclictest1154583-21latency_hist09:40:010
1003962996051,6cyclictest1134808-21latency_hist09:20:010
1003962995849,6cyclictest1253668-21latency_hist11:20:010
1003962995747,7cyclictest278-21systemd-journal12:10:010
1003964995344,6cyclictest1025601-21latency_hist07:30:011
1003962995139,9cyclictest278-21systemd-journal10:35:000
1003964994944,3cyclictest974891-21kworker/u8:3+flush-8:008:53:581
1003964994738,7cyclictest1283927-21/usr/sbin/munin11:54:061
1003962994741,4cyclictest1008984-21kworker/u8:1+events_unbound07:15:030
1003964994638,6cyclictest1318579-21/usr/sbin/munin12:29:121
1003964994638,6cyclictest1026128-21/usr/sbin/munin07:34:121
1003964994637,6cyclictest1164448-21latency_hist09:50:011
1003962994639,5cyclictest278-21systemd-journal08:35:000
1003964994537,6cyclictest1229502-21apt-get10:58:571
1003964994537,6cyclictest1129893-21latency_hist09:15:021
1003964994535,8cyclictest1178701-21ntpq10:04:101
1003962994535,8cyclictest1332321-21ntpq12:39:130
1003964994437,5cyclictest974891-21kworker/u8:3+flush-8:009:09:121
1003964994337,4cyclictest1050655-21kworker/u8:1+flush-8:008:28:581
1003964994235,5cyclictest1203914-21grep10:29:161
1003964994235,5cyclictest1015692-21latency_hist07:20:001
1003964994234,6cyclictest1303207-21latency_hist12:10:011
1003962994236,4cyclictest1204504-21kworker/u8:3+flush-8:011:33:580
1003964994136,3cyclictest1323242-21kworker/u8:1+flush-8:012:39:041
1003964994134,5cyclictest278-21systemd-journal11:09:251
1003968994031,7cyclictest1293865-21apt-get12:03:542
1003964994033,5cyclictest1199099-21latency_hist10:25:011
1003964994031,7cyclictest1140305-21/usr/sbin/munin09:29:071
1003962994029,9cyclictest1209792-21diskstats10:39:030
1003964993935,3cyclictest3843455-21kworker/u8:2+flush-8:008:24:041
1003964993932,5cyclictest1050943-21apt-get07:58:541
1003964993931,6cyclictest1044854-21ntpq07:49:081
1003962993935,3cyclictest1089973-21kworker/u8:0+flush-8:011:44:160
1003962993933,4cyclictest1204504-21kworker/u8:3+flush-8:011:02:250
1003962993932,5cyclictest278-21systemd-journal09:06:570
11988032380,9sleep3451irq_work/310:24:143
1003964993829,6cyclictest1248729-21latency_hist11:15:011
1003964993733,3cyclictest1089973-21kworker/u8:0+flush-8:008:48:591
1003964993630,4cyclictest974891-21kworker/u8:3+flush-8:007:39:091
1003964993628,6cyclictest1089973-21kworker/u8:0+flush-8:009:34:131
1003962993631,3cyclictest1194968-21fschecks_count10:23:580
1003964993530,4cyclictest1253614-21kworker/u8:4+flush-8:011:39:051
1003964993530,4cyclictest1253614-21kworker/u8:4+flush-8:011:39:051
1003964993530,4cyclictest1204504-21kworker/u8:3+flush-8:011:28:301
1003964993529,5cyclictest1089973-21kworker/u8:0+events_unbound08:44:001
1003964993529,5cyclictest1089973-21kworker/u8:0+events_unbound08:44:001
1003964993528,5cyclictest1089973-21kworker/u8:0+flush-8:008:39:141
1003964993525,8cyclictest1223389-21ntpq10:49:071
1003962993527,6cyclictest278-21systemd-journal08:30:000
1003962993524,9cyclictest1322406-21ntpq12:29:080
1003968993426,6cyclictest1081132-21cut08:28:582
1003964993429,3cyclictest1066228-21cpuspeed_turbos08:14:011
1003962993429,4cyclictest1089973-21kworker/u8:0+flush-8:008:44:180
1003962993429,4cyclictest1089973-21kworker/u8:0+flush-8:008:44:180
1003968993328,4cyclictest278-21systemd-journal09:20:002
1003968993326,5cyclictest278-21systemd-journal07:35:012
1003964993329,2cyclictest1254956-21irqrtprio11:24:041
1003964993328,3cyclictest1204504-21kworker/u8:3+events_unbound11:59:081
1003964993328,3cyclictest1120026-21latency_hist09:05:011
1003964993327,5cyclictest1089973-21kworker/u8:0+flush-8:010:19:121
1003964993327,4cyclictest1204504-21kworker/u8:3+flush-8:011:19:091
1003962993326,5cyclictest1288366-21kworker/u8:2+flush-8:012:24:000
1003962993326,5cyclictest1050655-21kworker/u8:1+events_unbound08:03:580
1003962993323,7cyclictest1233915-21latency_hist11:00:010
1003964993227,4cyclictest961004-21kworker/u8:0+flush-8:007:24:141
1003964993227,4cyclictest1050655-21kworker/u8:1+events_unbound10:09:161
1003964993226,4cyclictest1293550-21kworker/u8:0+flush-8:012:14:071
1003964993226,3cyclictest1131166-21irqrtprio09:19:041
1003964993225,6cyclictest1050655-21kworker/u8:1+events_unbound10:13:561
1003964993224,6cyclictest1169961-21apt-get09:58:581
1003962993227,4cyclictest974891-21kworker/u8:3+flush-8:008:59:000
1003962993224,6cyclictest1219630-21apt-get10:48:530
1003962993222,7cyclictest1169412-21latency_hist09:55:010
1003964993125,5cyclictest1050655-21kworker/u8:1+events_unbound10:44:131
1003964993125,4cyclictest974891-21kworker/u8:3+flush-8:008:34:071
1003964993125,4cyclictest1089973-21kworker/u8:0+events_unbound11:43:591
1003964993124,5cyclictest1204504-21kworker/u8:3+flush-8:010:34:031
1003964993124,5cyclictest1135088-21kworker/u8:2+flush-8:009:53:301
1003964993123,6cyclictest1288366-21kworker/u8:2+flush-8:012:24:101
100396299316,23cyclictest1164486-21kworker/0:1+events11:48:550
1003962993121,8cyclictest1109546-21ntpq08:54:090
1003968993021,7cyclictest1095230-21gpgv08:40:002
1003964993024,4cyclictest1110686-21apt-get08:58:561
1003962993025,3cyclictest1089973-21kworker/u8:0+events_unbound08:39:150
1003962993024,4cyclictest3843455-21kworker/u8:2+events_unbound07:45:010
1003962993021,7cyclictest1204027-21latency_hist10:30:010
1003964992924,3cyclictest3843455-21kworker/u8:2+flush-8:008:19:031
1003964992923,4cyclictest1050655-21kworker/u8:1+events_unbound09:39:081
1003964992922,5cyclictest1209543-21apt-get10:38:591
1003962992926,2cyclictest1184255-21latency_hist10:10:000
1003962992926,2cyclictest1070404-21systemd-run08:15:000
1003962992922,5cyclictest1065214-21apt-get08:10:010
1003962992921,6cyclictest1080269-21latency_hist08:25:010
1003968992824,2cyclictest1263452-21unixbench_multi11:29:142
1003964992823,3cyclictest1264893-21irqrtprio11:34:011
1003964992822,4cyclictest1298536-21kworker/u8:1+events_unbound12:19:111
1003964992821,5cyclictest1278974-21/usr/sbin/munin11:49:071
1003962992824,2cyclictest1101545-21irqrtprio08:49:030
1003962992823,4cyclictest1288366-21kworker/u8:2+events_unbound12:20:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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