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2026-07-29 - 11:23

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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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Wed Jul 29, 2026 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16855082730,2chrt583-21kworker/3:2+events19:22:593
20016082530,5chrt0-21swapper/100:37:591
1672446994940,6cyclictest1838324-21latency_hist21:55:001
1672442994839,6cyclictest1672612-21base6419:10:010
1672442994741,4cyclictest1947703-21kworker/u8:3+flush-8:023:58:110
1672442994638,5cyclictest1822987-21latency_hist21:40:010
1672442994535,7cyclictest278-21systemd-journal22:30:010
1672442994438,4cyclictest1957223-21kworker/u8:1+events_unbound00:05:010
1672442994436,6cyclictest1763864-21kworker/u8:0+flush-8:021:18:080
1672446994333,7cyclictest278-21systemd-journal22:25:001
1672442994337,5cyclictest1689287-21kworker/u8:3+events_unbound20:17:590
1672442994136,4cyclictest1888310-21kworker/u8:3+events_unbound22:52:590
1672442994134,5cyclictest1763864-21kworker/u8:0+flush-8:021:53:100
1672442994035,4cyclictest1662580-21kworker/u8:2+flush-8:019:53:090
1672442994035,4cyclictest1662580-21kworker/u8:2+events_unbound20:38:070
1672446993929,7cyclictest1684306-21latency_hist19:20:001
1672442993934,3cyclictest1652333-21kworker/u8:1+events_unbound19:15:040
1672442993933,4cyclictest1833615-21kworker/u8:3+flush-8:022:23:000
1672442993932,5cyclictest1803460-21kworker/u8:1+flush-8:021:48:040
1672442993833,4cyclictest1763864-21kworker/u8:0+flush-8:022:13:080
167244299380,35cyclictest1977431-21true00:15:000
1672446993728,6cyclictest1743612-21latency_hist20:20:001
1672442993732,3cyclictest1662580-21kworker/u8:2+flush-8:019:23:000
1672446993630,4cyclictest1763864-21kworker/u8:0+flush-8:020:47:541
1672442993630,4cyclictest1947703-21kworker/u8:3+events_unbound23:48:060
1672442993630,4cyclictest1947703-21kworker/u8:3+events_unbound23:48:060
1672448993525,7cyclictest1758449-21apt20:35:002
1672448993524,8cyclictest1768617-21awk20:45:002
1672446993530,3cyclictest1778657-21latency_hist20:55:011
1672446993528,4cyclictest1652333-21kworker/u8:1+flush-8:019:27:541
1672442993530,3cyclictest1932857-21kworker/u8:2+events_unbound23:52:570
1672442993530,3cyclictest1893300-21kworker/u8:2+flush-8:022:57:580
1672446993429,3cyclictest1724076-21kworker/u8:0+flush-8:020:12:581
1672446993429,3cyclictest1724076-21kworker/u8:0+flush-8:020:12:571
1672446993428,4cyclictest1962819-21apt-get00:02:491
1672446993426,5cyclictest1907885-21latency_hist23:05:011
1672446993423,8cyclictest278-21systemd-journal23:35:171
1672442993427,5cyclictest1729244-21apt-get20:07:470
16720892344,10sleep10-21swapper/119:09:541
1672446993327,4cyclictest1933067-21apt-get23:32:481
1672446993325,5cyclictest1662580-21kworker/u8:2+flush-8:019:43:061
1672442993327,4cyclictest1763864-21kworker/u8:0+flush-8:021:13:020
1672442993325,6cyclictest1753516-21latency_hist20:30:010
1672446993227,3cyclictest1724842-21irqcore20:02:551
1672446993226,4cyclictest1797458-21needreboot21:13:001
1672446993222,7cyclictest1853173-21latency_hist22:10:011
1672442993227,4cyclictest1763864-21kworker/u8:0+flush-8:021:43:030
1672442993227,3cyclictest1662580-21kworker/u8:2+events_unbound19:37:550
1672446993125,4cyclictest1832405-21ntp_kernel_pll_21:48:021
1672446993123,6cyclictest1672845-21/usr/sbin/munin19:12:591
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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