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2026-08-07 - 11:26

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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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 Fri Aug 07, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2929722110,3sleep029299-21timerandwakeup21:15:270
2762221950,3sleep027621-21/usr/sbin/munin21:10:170
965821330,3chrt9400-21/usr/sbin/munin20:00:210
2390721290,3sleep023906-21pluginstate20:55:230
1313321220,2sleep013134-21munin-plugin-st20:15:000
486821190,4chrt4869-21sshd23:53:450
453621160,4chrt4537-21/usr/sbin/munin19:40:220
673821130,3chrt6740-21latency_hist19:50:010
3187921120,4sleep031366-21/usr/sbin/munin21:25:300
1984321120,3sleep019847-21ntp_states22:45:240
1193721110,3sleep011935-21ntp_states00:20:240
2495521050,4sleep024891-21/usr/sbin/munin21:00:150
1167921050,4sleep011668-21latency_hist22:15:020
1044821050,2sleep010447-21sed22:10:010
2817221040,4sleep028228-21users19:05:260
108802920,3sleep010882-21/usr/sbin/munin20:05:200
323432900,4sleep032415-21latency_hist23:35:010
18412860,3sleep01868-21sort19:30:190
326922837,64sleep032707-21munin-run19:25:000
45042810,4sleep04576-21switchtime21:45:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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