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2026-09-22 - 21:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 highest latencies:
System rack5slot7s.osadl.org (updated Tue Sep 22, 2026 12:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11465224392200,97sleep00-21swapper07:09:570
115149916518,123cyclictest499-21munin-run09:20:020
115149916412,127cyclictest19925-21wc08:00:060
115149916013,107cyclictest12487-21wc07:15:190
115149915917,117cyclictest3708-21munin-run09:40:030
115149915910,104cyclictest9652-21/usr/sbin/munin10:15:260
115149915814,120cyclictest10799-21grep10:20:520
115149915814,104cyclictest16795-21munin-run11:00:010
115149915741,23cyclictest28850-21missed_timers12:10:460
115149915713,26cyclictest3845-21apt-config09:40:110
115149915711,120cyclictest22455-21apt-get08:15:160
115149915617,115cyclictest13747-21irqstats07:20:390
115149915616,115cyclictest1582-21irqstats09:25:370
115149915613,52cyclictest23444-21/usr/sbin/munin08:21:100
115149915613,117cyclictest27443-21/usr/sbin/munin08:45:370
115149915510,22cyclictest29635-21memory12:15:450
115149915417,110cyclictest11283-21apt-get10:25:170
115149915416,113cyclictest17333-21zcat11:00:560
115149915414,117cyclictest21475-21ntp_states11:25:510
115149915413,116cyclictest20691-21apt08:05:020
115149915317,108cyclictest24241-21apt-get08:25:170
115149915315,23cyclictest19203-21apt-get11:16:310
115149915310,61cyclictest26108-21apt-config11:55:230
115149915216,27cyclictest31334-21ntp_states12:25:510
115149915213,29cyclictest7076-21head09:56:060
115149915212,27cyclictest29034-21/usr/sbin/munin08:56:100
115149915212,24cyclictest16783-21/usr/sbin/munin07:40:090
115149915211,29cyclictest15805-21grep07:31:030
115149915210,122cyclictest14969-21sort07:26:030
115149915114,111cyclictest15963-21apt-get07:35:130
115149915112,114cyclictest31398-21sort09:10:050
115149915075,52cyclictest25776-21wc08:35:040
115149915019,108cyclictest31687-21memory09:10:440
115149915018,34cyclictest4858-21apt-get09:45:160
115149915016,24cyclictest27666-21users12:01:140
115149915015,24cyclictest21588-21apt-get08:10:220
115149915015,112cyclictest12322-21munin-node07:15:100
115149915015,110cyclictest616-21/usr/sbin/munin09:20:390
115149915012,40cyclictest24979-21grep11:46:030
115149915012,25cyclictest15408-21diskstats10:50:370
115149915012,116cyclictest21077-21ntpq08:05:490
11514991498,39cyclictest30272-21/usr/sbin/munin09:00:570
115149914934,19cyclictest6229-21ls09:51:050
115149914930,23cyclictest2319-21diskstats09:30:380
115149914926,21cyclictest18512-21kworker/u2:611:20:190
115149914917,91cyclictest27911-21df_inode12:05:300
115149914917,107cyclictest13881-21irqstats10:40:380
115149914913,113cyclictest7924-21users10:01:040
115149914911,24cyclictest26510-21cron08:40:000
115149914911,116cyclictest18391-21wc07:50:230
115149914911,113cyclictest16882-21snmpd11:05:590
11514991489,115cyclictest8588-21cat10:06:010
115149914816,107cyclictest17826-21memory07:45:440
115149914815,44cyclictest810-21users12:36:070
115149914815,108cyclictest28239-21apt-get08:50:130
115149914811,115cyclictest12198-21diskstats10:30:380
115149914720,27cyclictest12983-21df10:35:240
115149914714,23cyclictest8960-21df10:10:290
115149914713,107cyclictest30223-21/usr/sbin/munin12:20:220
115149914712,112cyclictest19218-21latency_hist11:15:050
115149914712,111cyclictest22752-21apt-get11:35:210
115149914711,113cyclictest31815-21apt-get12:30:180
115149914615,27cyclictest25225-21/usr/sbin/munin11:50:260
115149914612,109cyclictest22197-21memory11:30:430
11514991447,113cyclictest26761-21entropy08:40:360
115149914416,28cyclictest23670-21df11:40:250
115149914411,92cyclictest15263-21ls10:50:040
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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