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2026-09-06 - 20:56

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 Sep 06, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1778821330,5chrt17789-21mailstats08:30:260
832321220,2sleep08322-21processes12:05:250
1194021210,2sleep011939-21idleruntime12:20:140
1520321200,3sleep015202-21users10:25:270
968121160,2sleep09684-21mailstats12:10:250
435921160,3sleep04358-21tr11:50:200
326921070,3sleep03268-21tr09:40:200
53121007,14sleep0599-21ps11:35:250
1265321000,3sleep012713-21cat08:10:270
150462990,3sleep015073-21/usr/sbin/munin08:20:210
96152956,13sleep09665-21df08:00:110
9322950,2sleep0934-21timerandwakeup09:30:280
84942890,4sleep08511-21/usr/sbin/munin07:55:190
82982856,65sleep08323-21latency10:00:180
18212840,4sleep01850-21awk11:40:260
144732836,62sleep014508-21cut10:25:000
289732805,61sleep029025-21df09:15:120
34072740,3sleep03408-21ntpq07:35:210
2790827320,31sleep027914-21df_inode07:05:110
55282690,3sleep05527-21latency_hist09:50:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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