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2026-06-28 - 17:58

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 50 highest latencies:
System rackeslot4s.osadl.org (updated Sun Jun 28, 2026 12:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1182689995855,2cyclictest1244621-21latency_hist08:10:011
1182685994640,4cyclictest1213732-21latency_hist07:40:020
1182685994438,4cyclictest1182995-21base6407:10:010
1182697994339,3cyclictest1291266-21kworker/u8:1+events_unbound09:15:013
1182697994339,3cyclictest1249777-21kworker/u8:2+flush-259:008:24:593
1182697994240,2cyclictest1389893-21kworker/u8:3+flush-259:011:05:003
1182689994237,3cyclictest1379556-21latency_hist10:20:021
1182694994135,4cyclictest1338096-21/usr/sbin/munin09:40:142
1182697993835,2cyclictest1420941-21kworker/u8:2+flush-259:011:05:253
1182697993835,2cyclictest1410474-21kworker/u8:1+events_unbound10:55:003
1182697993835,2cyclictest1171954-21kworker/u8:0+events_unbound07:10:013
1182697993734,2cyclictest1291266-21kworker/u8:1+flush-259:009:15:153
1182697993734,2cyclictest1239700-21kworker/u8:3+flush-259:008:34:593
1182697993734,2cyclictest1171954-21kworker/u8:0+events_unbound07:10:253
1182685993731,5cyclictest335557-21systemd-journal11:00:000
1182697993633,2cyclictest1291266-21kworker/u8:1+flush-259:009:05:223
1182694993633,2cyclictest1498897-21kworker/u8:1+events_unbound12:30:212
1182694993631,3cyclictest1348835-21kworker/u8:1+flush-259:010:05:162
1182694993630,4cyclictest1504125-21latency_hist12:20:012
1182689993632,3cyclictest1400198-21kworker/u8:0+flush-259:011:50:161
1182685993631,3cyclictest1461955-21latency_hist11:40:010
1182685993629,5cyclictest335557-21systemd-journal11:35:000
1182697993532,2cyclictest1270409-21kworker/u8:0+events_unbound08:40:203
1182685993529,4cyclictest1332694-21latency_hist09:35:010
1182697993429,4cyclictest1296438-21/usr/sbin/munin09:00:173
1182697993429,4cyclictest1296438-21/usr/sbin/munin09:00:163
1182697993428,4cyclictest1354192-21diskstats09:55:153
1182689993428,4cyclictest1509307-21latency_hist12:25:011
1182689993428,4cyclictest1405335-21latency_hist10:45:011
1182685993430,3cyclictest1348835-21kworker/u8:1+flush-259:010:20:150
1182697993330,2cyclictest1498897-21kworker/u8:1+events_unbound12:25:013
1182697993330,2cyclictest1163272-21kworker/u8:1+flush-259:007:45:203
1182689993328,3cyclictest335557-21systemd-journal11:45:521
1182697993229,2cyclictest1400198-21kworker/u8:0+events_unbound11:25:253
1182697993229,2cyclictest1348835-21kworker/u8:1+events_unbound10:15:183
1182697993229,2cyclictest1327742-21kworker/u8:3+events_unbound10:10:203
1182697993229,2cyclictest1249777-21kworker/u8:2+flush-259:008:55:263
1182697993229,2cyclictest1249777-21kworker/u8:2+flush-259:008:55:263
1182697993229,2cyclictest1249777-21kworker/u8:2+flush-259:008:15:153
1182697993228,3cyclictest1337856-21latency_hist09:40:013
1182697993228,3cyclictest1198320-21kworker/u8:3+events_unbound07:35:003
1182694993229,2cyclictest1451657-21kworker/u8:1+events_unbound11:45:242
1182694993229,2cyclictest1436358-21kworker/u8:4+flush-259:011:30:002
1182694993229,2cyclictest1198320-21kworker/u8:3+flush-259:007:40:252
1182694993125,4cyclictest1493758-21cp12:10:002
1182697993027,2cyclictest1420941-21kworker/u8:2+events_unbound11:10:213
1182697993027,2cyclictest1198320-21kworker/u8:3+flush-259:007:35:213
1182697993027,2cyclictest1163272-21kworker/u8:1+events_unbound07:40:133
1182697993024,4cyclictest335557-21systemd-journal09:25:003
1182694993024,4cyclictest335557-21systemd-journal09:29:382
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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