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2026-03-15 - 08:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #8

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackeslot8s.osadl.org (updated Sun Mar 15, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21027339911381,1132cyclictest2428474-21sleep23:10:013
2102733998573,850cyclictest2552010-21sleep00:34:593
2102733996641,658cyclictest2305693-21sleep21:45:003
2102733993080,304cyclictest2108900-21turbostat19:19:553
25398982500,1sleep30-21swapper/300:25:173
72699270,4ntpd2528204-21taskset00:15:232
72699250,9ntpd2203647-21ntpq20:25:211
72699240,7ntpd2269229-21apt-get21:20:030
72699240,7ntpd2241016-21ntpq20:55:201
72699240,7ntpd2128709-21ntpq19:25:202
72699240,6ntpd2269816-21ssh21:20:102
72699230,8ntpd2254680-21diskmemload21:45:442
72699230,7ntpd2419389-21ntpq23:00:191
72699230,7ntpd2419389-21ntpq23:00:191
72699230,6ntpd2228621-21ntpq20:45:211
72699230,6ntpd2161131-21apt-get19:55:110
72699230,6ntpd2102921-21apt-get19:10:121
72699230,2ntpd0-21swapper/120:00:211
72699220,9ntpd2406425-21taskset22:53:300
72699220,8ntpd2412319-21ntpq22:55:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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