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2026-03-21 - 09:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 100 highest latencies:
System rack3slot3s.osadl.org (updated Sat Mar 21, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
895858213253,74sleep30-21swapper/33
89572028555,11sleep20-21swapper/22
89555128455,11sleep10-21swapper/11
89421528053,15sleep00-21swapper/00
10984602350,2sleep0221rcuc/00
896025992826,1cyclictest0-21swapper/33
896025992725,1cyclictest0-21swapper/33
896025992523,1cyclictest0-21swapper/33
896025992523,1cyclictest0-21swapper/33
896025992513,1cyclictest0-21swapper/33
896025992422,1cyclictest0-21swapper/33
896025992422,1cyclictest0-21swapper/33
896025992420,2cyclictest0-21swapper/33
12320272240,3sleep10-21swapper/11
10782972241,9sleep11026589-21diskmemload1
896025992321,1cyclictest0-21swapper/33
896025992320,1cyclictest0-21swapper/33
896025992319,2cyclictest0-21swapper/33
896025992319,1cyclictest0-21swapper/33
896025992220,1cyclictest0-21swapper/33
896025992220,1cyclictest0-21swapper/33
896025992220,1cyclictest0-21swapper/33
896025992219,1cyclictest0-21swapper/33
896025992219,1cyclictest0-21swapper/33
896025992218,2cyclictest0-21swapper/33
896025992218,2cyclictest0-21swapper/33
896025992218,2cyclictest0-21swapper/33
896025992218,2cyclictest0-21swapper/33
896025992218,2cyclictest0-21swapper/33
89602599221,17cyclictest1015723-21taskset3
12436412220,15sleep20-21swapper/22
896025992119,1cyclictest0-21swapper/33
896025992119,1cyclictest0-21swapper/33
896025992118,1cyclictest0-21swapper/33
896025992118,1cyclictest0-21swapper/33
89602599211,16cyclictest0-21swapper/33
89602599211,16cyclictest0-21swapper/33
12273212211,6sleep00-21swapper/00
89602599207,2cyclictest0-21swapper/33
89602599205,12cyclictest0-21swapper/33
896025992018,1cyclictest0-21swapper/33
896025992018,1cyclictest0-21swapper/33
896025992018,1cyclictest0-21swapper/33
896025992018,1cyclictest0-21swapper/33
896025992018,1cyclictest0-21swapper/33
896025992017,1cyclictest0-21swapper/33
896025992017,1cyclictest0-21swapper/33
896025992017,1cyclictest0-21swapper/33
896025992017,1cyclictest0-21swapper/33
896025992016,2cyclictest0-21swapper/33
89602599201,12cyclictest0-21swapper/33
13321102201,8sleep11026589-21diskmemload1
896025991917,1cyclictest0-21swapper/33
896025991917,1cyclictest0-21swapper/33
896025991917,1cyclictest0-21swapper/33
896025991916,1cyclictest0-21swapper/33
896025991916,1cyclictest0-21swapper/33
896025991914,2cyclictest0-21swapper/33
896025991912,4cyclictest940653-21chrt3
13162722191,3sleep10-21swapper/11
89602599182,13cyclictest0-21swapper/33
896025991816,1cyclictest0-21swapper/33
896025991815,2cyclictest0-21swapper/33
896025991815,1cyclictest0-21swapper/33
896025991815,1cyclictest0-21swapper/33
896025991815,1cyclictest0-21swapper/33
89602599181,13cyclictest0-21swapper/33
11761312181,13sleep01-21systemd0
11761312181,13sleep01-21systemd0
10453772189,4sleep01046927-21tr0
896025991715,1cyclictest0-21swapper/33
896025991715,1cyclictest0-21swapper/33
896025991715,1cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
896025991713,2cyclictest0-21swapper/33
89602599170,6cyclictest951901-21taskset3
13838442171,3sleep00-21swapper/00
11907292170,1sleep00-21swapper/00
11564742171,3sleep10-21swapper/11
10508102171,3sleep20-21swapper/22
896025991614,1cyclictest0-21swapper/33
896025991613,1cyclictest0-21swapper/33
13935442160,1sleep00-21swapper/00
13769712161,4sleep21026589-21diskmemload2
13494612161,2sleep20-21swapper/22
10582992161,3sleep10-21swapper/11
10510982161,10sleep11026589-21diskmemload1
10401962162,8sleep21040260-21ntpq2
9834942151,11sleep1802-21snmpd1
13743832150,3sleep10-21swapper/11
12884762150,2sleep00-21swapper/00
12011632151,3sleep11026589-21diskmemload1
11018722151,4sleep11101933-21ld1
10534832151,3sleep21053505-21apt-get2
13678232141,8sleep11026589-21diskmemload1
12130892141,7sleep01214668-21cut0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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