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2025-12-09 - 14:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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 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: 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 rack4slot1s.osadl.org (updated Tue Dec 09, 2025 12:44:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2316621260,3sleep30-21swapper/308:29:113
1256021040,2sleep20-21swapper/209:29:032
1256021040,2sleep20-21swapper/209:29:032
1954121030,3sleep30-21swapper/311:14:003
1954121030,3sleep30-21swapper/311:14:003
19412840,2sleep11944-21unixbench-2d10:24:181
19412840,2sleep11944-21unixbench-2d10:24:181
166792820,3chrt0-21swapper/212:29:162
75812810,3chrt0-21swapper/010:39:160
75812810,3chrt0-21swapper/010:39:160
280082720,3chrt0-21swapper/211:34:132
280082720,3chrt0-21swapper/211:34:132
72242650,2sleep00-21swapper/009:14:060
72242650,2sleep00-21swapper/009:14:060
150862630,2chrt0-21swapper/009:34:120
150862630,2chrt0-21swapper/009:34:120
83152610,2sleep00-21swapper/010:44:030
83152610,2sleep00-21swapper/010:44:030
95762550,2chrt9575-21sendmail_mailqu09:19:141
66662550,2sleep20-21swapper/212:04:082
66662550,2sleep20-21swapper/212:04:082
200932550,4sleep30-21swapper/309:49:063
200932550,4sleep30-21swapper/309:49:063
6642530,3sleep20-21swapper/211:49:042
6642530,3sleep20-21swapper/211:49:042
40082490,2chrt0-21swapper/211:58:572
40082490,2chrt0-21swapper/211:58:572
255502480,2chrt0-21swapper/210:03:572
255502480,2chrt0-21swapper/210:03:572
26577994318,23cyclictest11905-21sshd09:24:220
26577994318,23cyclictest11905-21sshd09:24:220
83162410,1sleep0171ktimers/012:09:040
83162410,1sleep0171ktimers/012:09:040
26578994023,8cyclictest91-1pr/ttyS009:46:161
26578994023,8cyclictest91-1pr/ttyS009:46:161
26577994027,11cyclictest480-21sshd10:15:220
26577994027,11cyclictest480-21sshd10:15:220
88142390,3sleep30-21swapper/312:09:113
88142390,3sleep30-21swapper/312:09:113
82652390,3sleep10-21swapper/110:43:591
82652390,3sleep10-21swapper/110:43:591
26577993911,4cyclictest24181-21/usr/sbin/munin08:34:070
26577993911,4cyclictest24181-21/usr/sbin/munin08:34:070
310532380,2sleep20-21swapper/211:44:062
26577993832,4cyclictest2812-21latency_hist09:03:520
26577993818,19cyclictest14958-21fschecks_count08:09:050
26577993818,19cyclictest14958-21fschecks_count08:09:050
26577993816,20cyclictest0-21swapper/010:29:150
26577993816,20cyclictest0-21swapper/010:19:130
26577993816,20cyclictest0-21swapper/010:19:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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