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2025-12-06 - 20:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot6s.osadl.org (updated Sat Dec 06, 2025 12:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1587622420,2sleep015879-21missed_timers10:40:220
794421470,4chrt7943-21missed_timers12:15:190
2481321380,4chrt24814-21if_eth011:15:160
1345021380,4chrt13158-21/usr/sbin/munin08:25:230
2281321360,2sleep022816-21sort09:00:300
2074921340,3chrt20747-21ls11:00:020
2846121330,2chrt28464-21cron11:30:000
40721070,4sleep0440-21netstat07:35:210
2235721040,4sleep022398-21ntpq11:05:210
55232980,3sleep05527-21/usr/sbin/munin07:55:190
276102940,4sleep027636-21memory09:20:180
109642910,4sleep011017-21timerandwakeup10:20:280
93222860,5sleep09355-21latency10:15:170
148342860,3sleep014903-21timerwakeupswit10:35:290
302172840,3sleep030262-21netstat09:30:250
2491627620,33sleep024966-21df07:05:130
26119996942,15cyclictest31480-21ntp_states11:40:250
39782680,2sleep04042-21sort07:50:010
26119996837,18cyclictest23410-21/usr/sbin/munin11:10:290
26119996837,18cyclictest12303-21/usr/sbin/munin10:25:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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