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2026-04-06 - 05:01

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 Mon Apr 06, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
974822030,2sleep09746-21ls22:45:240
1130821330,3chrt11307-21sshd20:45:270
185379912832,16cyclictest7156-21/usr/sbin/munin20:30:220
185379912731,16cyclictest351-21/usr/sbin/munin00:15:230
185379912232,15cyclictest12012-21/usr/sbin/munin22:55:160
2644921200,3chrt26040-21/usr/sbin/munin23:50:250
18537991159,16cyclictest19600-21/usr/sbin/munin23:25:270
185379911431,14cyclictest4827-21runrttasks00:33:010
3272821120,3chrt32729-21latency_hist20:05:000
3012321120,4sleep030162-21df22:00:140
185379911210,17cyclictest22644-21ntp_states21:30:230
18537991119,15cyclictest221242sleep023:35:010
18537991058,18cyclictest23336-21munin-run23:40:000
298921030,2sleep02991-21ls22:20:170
597421010,3sleep05989-21vmstat22:30:290
30462890,4sleep03097-21/usr/sbin/munin20:15:170
269372770,3sleep026941-21timerandwakeup19:40:270
1753927218,31sleep017595-21ntpq19:05:180
133142700,2sleep013315-21cat23:00:160
18537996434,21cyclictest31398-21/usr/sbin/munin00:10:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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