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2026-03-15 - 05:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot6s.osadl.org (updated Sun Mar 15, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2114622720,3sleep021143-21cat20:25:270
2701622480,3sleep027013-21grep20:50:020
2871921280,4chrt28222-21/usr/sbin/munin23:00:270
311621250,3chrt3117-21sshd21:21:190
11649912531,16cyclictest20117-21runrttasks00:34:410
1656821220,3chrt16567-21/usr/sbin/munin00:20:150
11649912128,16cyclictest23261-21/usr/sbin/munin20:35:110
11649911931,16cyclictest3523-21runrttasks19:18:290
11649911728,15cyclictest15216-21runrttasks20:03:590
11649911727,14cyclictest25614-21runrttasks20:44:330
11649911724,15cyclictest27083-21munin-node20:50:100
11649911625,15cyclictest17235-21runrttasks22:15:510
11649911625,14cyclictest32406-21/usr/sbin/munin21:10:160
3214021150,4sleep032144-21df_inode23:15:160
11649911531,72cyclictest1471-21/usr/sbin/munin19:10:190
11649911526,15cyclictest20138-21runrttasks22:28:210
2307321140,3sleep023089-21munin-run20:35:000
11649911419,16cyclictest14309-21ntpq22:05:210
2352921130,4chrt23530-21/usr/sbin/munin22:40:240
11649911327,12cyclictest9661-21runrttasks21:47:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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