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2026-05-18 - 08:56

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 here to display the system's profile data or here to proceed to next system.
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 May 18, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
316322580,3sleep03164-21cat21:00:310
1809222530,2sleep018093-21sh19:55:000
3148121250,4chrt31480-21/usr/sbin/munin22:50:260
1973421240,2sleep019733-21timerandwakeup00:10:270
1568521200,4chrt15686-21processes23:55:240
2577421170,2sleep025775-21cat00:35:150
2198121170,3chrt21977-21latency00:20:160
1714521170,2sleep017144-21cat00:00:270
6510991147,94cyclictest21707-21runrttasks00:20:020
6510991145,14cyclictest13247-21memory19:35:180
65109911410,90cyclictest6892-21ntp_states19:10:210
6510991139,89cyclictest28907-21/usr/sbin/munin20:35:250
6510991138,92cyclictest10769-21sendmail_mailst21:30:260
6510991138,91cyclictest6323-21/usr/sbin/munin23:20:300
6510991136,14cyclictest9272-21df_inode19:20:130
65109911310,89cyclictest7317-21chrt21:17:220
6510991129,13cyclictest22025-21df22:15:140
6510991128,92cyclictest22393-21runrttasks20:10:220
6510991128,89cyclictest15709-21df19:45:140
6510991128,16cyclictest268352chrt20:27:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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