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2026-08-29 - 05:05

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 20 highest latencies:
System rack5slot4s.osadl.org (updated Sat Aug 29, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
168510521520,2sleep3481ktimers/321:07:383
16667412800,2chrt575-21kworker/3:2-events20:47:553
1566619995243,6cyclictest1846720-21latency_hist23:50:011
17102352480,3sleep10-21swapper/121:32:401
1566619994335,6cyclictest275-21systemd-journal00:20:001
1566614994333,7cyclictest1816799-21apt-get23:20:010
156661499413,36cyclictest1643090-21kworker/0:0+events22:17:280
1566614994033,5cyclictest1707799-21latency_hist21:30:010
156661499403,35cyclictest1561604-21kworker/0:2+events19:37:430
156661499402,36cyclictest1643090-21kworker/0:0+events21:17:440
156661499402,36cyclictest1643090-21kworker/0:0+events20:57:340
156661499382,30cyclictest1767392-21kworker/0:1+events23:47:300
156661499382,30cyclictest1767392-21kworker/0:1+events00:02:300
156661499373,28cyclictest1603322-21kworker/0:1+events20:02:300
1566614993729,6cyclictest1638548-21/usr/sbin/munin20:22:480
156661499372,29cyclictest1603322-21kworker/0:1+events20:12:290
1566619993530,3cyclictest1657904-21munin-run20:40:001
156661499359,21cyclictest1767392-21kworker/0:1+events23:02:300
156661499353,30cyclictest1767392-21kworker/0:1+events22:37:300
156661499353,27cyclictest1643090-21kworker/0:0+events22:22:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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