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2025-12-19 - 21:36

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 50 highest latencies:
System rack3slot3s.osadl.org (updated Fri Dec 19, 2025 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1219200212354,64sleep30-21swapper/307:06:053
121492728654,20sleep00-21swapper/007:05:150
121926928252,9sleep20-21swapper/207:06:572
121943228165,10sleep10-21swapper/107:09:011
1219791992420,2cyclictest0-21swapper/310:10:183
1219791992319,2cyclictest0-21swapper/311:55:013
13905042220,1sleep11390508-21unixbench-2d09:45:271
121979199222,15cyclictest14961942chrt11:30:143
121979199222,15cyclictest14961942chrt11:30:133
1219791992219,1cyclictest0-21swapper/309:40:243
121979199221,8cyclictest1237318-21taskset07:20:403
121979199215,8cyclictest1570171-21turbostat12:40:003
121979199212,12cyclictest1385985-21taskset09:45:123
1219791992118,1cyclictest0-21swapper/307:39:563
1219791992117,2cyclictest0-21swapper/310:50:223
14443722201,9sleep21445044-21cut10:40:162
1219791992017,1cyclictest0-21swapper/311:50:003
1219791992017,1cyclictest0-21swapper/310:00:243
121979199201,12cyclictest0-21swapper/310:20:203
14650062191,9sleep11465112-21/usr/sbin/munin11:00:141
1219791991916,1cyclictest0-21swapper/309:35:163
1219791991916,1cyclictest0-21swapper/309:05:003
1219791991915,2cyclictest0-21swapper/308:40:003
1219791991915,1cyclictest0-21swapper/308:55:063
1219791991912,4cyclictest0-21swapper/309:05:123
121979199191,14cyclictest0-21swapper/312:15:113
121979199191,13cyclictest0-21swapper/311:25:143
121979199188,7cyclictest1511326-21chrt11:41:123
1219791991815,1cyclictest0-21swapper/312:10:013
121979199181,14cyclictest0-21swapper/311:35:213
121979199181,13cyclictest0-21swapper/312:30:103
15530472171,10sleep21553098-21ntpq12:20:192
1219791991713,2cyclictest0-21swapper/309:55:103
1219791991713,2cyclictest0-21swapper/309:25:153
1219791991713,2cyclictest0-21swapper/308:40:163
1219791991713,2cyclictest0-21swapper/307:25:223
121979199171,13cyclictest0-21swapper/310:35:103
121979199171,13cyclictest0-21swapper/309:20:203
121979199171,13cyclictest0-21swapper/309:20:203
121979199171,13cyclictest0-21swapper/309:15:113
121979199171,13cyclictest0-21swapper/308:30:203
121979199171,13cyclictest0-21swapper/307:40:283
121979199171,12cyclictest1225137-21turbostat07:15:003
121979199171,10cyclictest1555003-21taskset12:25:133
121979199171,10cyclictest1259102-21taskset07:45:093
1219791991710,2cyclictest0-21swapper/311:10:213
121979199170,7cyclictest12854071turbostat08:10:003
121979199170,14cyclictest0-21swapper/307:55:133
121979199170,13cyclictest0-21swapper/309:50:193
121979199170,11cyclictest1243146-21chrt07:30:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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