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2026-07-01 - 23:22

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 Wed Jul 01, 2026 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1970822570,3sleep019707-21tr08:10:200
2302522560,2sleep023027-21sh10:30:000
38509912632,15cyclictest20819-21/usr/sbin/munin08:15:130
2069321250,4chrt20688-21ntp_states12:25:240
38509912232,17cyclictest26075-21/usr/sbin/munin08:35:190
38509912229,15cyclictest9206-21/usr/sbin/munin07:30:140
1294321210,2sleep012941-21grep07:45:020
2341821180,4chrt23419-21/usr/sbin/munin10:30:210
38509911731,16cyclictest30574-21runrttasks08:52:090
1587321150,3chrt15871-21grep10:00:270
3850991128,15cyclictest7659-21/usr/sbin/munin09:30:410
3850991117,16cyclictest14577-21/usr/sbin/munin09:55:270
38509911110,16cyclictest14075-21irqstats12:00:140
3850991098,15cyclictest8778-21/usr/sbin/munin11:40:130
38509910910,18cyclictest6425-21/usr/sbin/munin09:25:120
1919621020,3sleep019242-21/usr/sbin/munin12:20:170
546021000,4sleep05236-21/usr/sbin/munin07:15:200
138272900,3sleep013914-21latency_hist12:00:020
249452880,4sleep024432-21/usr/sbin/munin10:35:280
144212880,4sleep014425-21/usr/sbin/munin07:50:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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