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2026-01-08 - 15:08

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 Thu Jan 08, 2026 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2806437211957,57sleep30-21swapper/307:05:073
281122428360,6sleep00-21swapper/007:08:420
281113728065,9sleep10-21swapper/107:07:331
281111827964,9sleep20-21swapper/207:07:182
30076232540,2sleep00-21swapper/010:20:150
2811458992724,1cyclictest0-21swapper/308:20:003
2811458992320,1cyclictest0-21swapper/312:10:013
281145899214,13cyclictest3042429-21taskset10:55:013
2811458992118,1cyclictest0-21swapper/310:50:193
2811458992118,1cyclictest0-21swapper/308:55:003
281145899201,9cyclictest2865859-21taskset07:55:213
2811458992017,1cyclictest0-21swapper/312:15:173
2811458992017,1cyclictest0-21swapper/311:30:003
2811458992017,1cyclictest0-21swapper/311:15:183
281145899201,14cyclictest0-21swapper/311:45:113
2811458991916,1cyclictest0-21swapper/312:35:173
2811458991916,1cyclictest0-21swapper/310:10:173
2811458991915,2cyclictest0-21swapper/310:45:233
2811458991915,2cyclictest0-21swapper/308:25:153
281145899191,14cyclictest2978322-21turbostat09:50:003
281145899191,14cyclictest2956483-21chrt09:25:383
281145899191,14cyclictest0-21swapper/308:00:143
281145899191,13cyclictest0-21swapper/311:50:103
281145899190,12cyclictest0-21swapper/308:35:183
281145899187,8cyclictest2984177-21turbostat10:04:553
2811458991816,1cyclictest0-21swapper/309:05:163
2811458991816,1cyclictest0-21swapper/309:05:003
2811458991815,1cyclictest0-21swapper/310:35:143
2811458991814,2cyclictest0-21swapper/309:40:003
281145899181,13cyclictest0-21swapper/312:25:103
281145899181,10cyclictest2821529-21taskset07:15:163
30632162171,10sleep13063427-21users11:15:241
29307912171,5sleep12930810-21apt-get09:05:091
28821212171,5sleep12882162-21ntpq08:15:201
281145899172,11cyclictest2860251-21taskset07:50:203
281145899171,5cyclictest3085375-21sleep11:40:013
2811458991715,1cyclictest0-21swapper/311:05:133
2811458991714,1cyclictest0-21swapper/311:40:153
2811458991714,1cyclictest0-21swapper/311:24:593
2811458991714,1cyclictest0-21swapper/307:45:163
2811458991713,2cyclictest0-21swapper/309:10:203
281145899171,13cyclictest0-21swapper/309:40:213
281145899171,13cyclictest0-21swapper/307:25:113
281145899171,12cyclictest3106930-21chrt12:00:113
281145899171,12cyclictest2914893-21turbostat08:50:003
281145899171,12cyclictest0-21swapper/307:40:113
30192292161,10sleep23020079-21sort10:30:162
28988632161,10sleep22899105-21base6408:35:002
281145899167,6cyclictest2872664-21turbostat08:10:003
281145899162,9cyclictest3117929-21taskset12:10:133
2811458991613,1cyclictest0-21swapper/312:30:163
2811458991613,1cyclictest0-21swapper/309:30:163
2811458991612,2cyclictest0-21swapper/310:30:003
281145899161,11cyclictest2984199-21sleep10:00:003
281145899161,10cyclictest2888315-21chrt08:24:143
281145899160,14cyclictest0-21swapper/310:15:113
281145899160,13cyclictest0-21swapper/310:30:103
281145899160,13cyclictest0-21swapper/309:20:313
281145899160,13cyclictest0-21swapper/308:55:213
281145899160,13cyclictest0-21swapper/307:30:173
31419402151,10sleep23142855-21missed_timers12:30:172
28285592151,9sleep22824528-21/usr/sbin/munin07:20:222
281145899152,9cyclictest3071162-21taskset11:25:153
281145899152,9cyclictest3005792-21taskset10:20:103
281145899151,9cyclictest2994663-21taskset10:09:203
281145899151,9cyclictest2994663-21taskset10:09:193
281145899151,9cyclictest2877591-21taskset08:10:593
281145899151,9cyclictest2829358-21taskset07:23:153
281145899151,9cyclictest2816442-21taskset07:12:203
281145899151,11cyclictest0-21swapper/310:40:183
2811458991511,1cyclictest0-21swapper/309:50:133
281145899151,10cyclictest3058318-21chrt11:12:093
281145899151,10cyclictest2840788-21chrt07:35:123
281145899150,13cyclictest0-21swapper/312:20:123
281145899150,12cyclictest0-21swapper/311:55:163
281145899150,12cyclictest0-21swapper/311:00:153
281145899150,12cyclictest0-21swapper/309:15:153
30696312141,9sleep13069642-21/usr/sbin/munin11:25:101
29505782140,7sleep02950630-21/usr/sbin/munin09:20:200
29199172140,1sleep00-21swapper/008:52:550
283977621410,2sleep22746992-21kworker/2:0+events_freezable07:32:172
281145899141,10cyclictest2893887-21chrt08:30:113
281145899140,11cyclictest0-21swapper/308:40:183
30842992131,7sleep03084350-21ntpq11:35:190
30824352130,9sleep23084136-21sed11:35:182
29057502131,7sleep02907435-21kthreadcore08:40:160
28658112138,2sleep20-21swapper/207:55:212
30696432121,7sleep23069680-21cpu11:25:112
30575272121,7sleep03057575-21ntpq11:10:180
30470962120,7sleep03047150-21ntpq11:00:160
30325192121,6sleep03032555-21kthreadcore10:45:130
29852542121,7sleep02986907-21kthreadcore10:00:110
29209202120,7sleep22922160-21grep08:55:172
28891722121,7sleep22889363-21kthreadcore08:25:152
28405332121,6sleep12840599-21tune2fs07:35:121
31216252111,5sleep13121671-21ntpq12:10:201
30643882111,2sleep00-21swapper/011:20:120
30335472111,6sleep13035273-21kthreadcore10:45:141
29999752111,5sleep12999994-21munin-run10:15:001
29308132111,6sleep22931063-21cstates09:05:102
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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