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2026-07-12 - 22:45

OSADL QA Farm on Real-time of Mainline Linux

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

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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackfslot4s.osadl.org (updated Sun Jul 12, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3103221250,3chrt31035-21sh11:00:000
3025321190,2chrt30227-21ntpq11:46:580
568621180,2chrt5689-21missed_timers10:21:180
2490221180,2sleep024905-21aten2.4_rfpower10:50:380
1312721180,2chrt13128-21runrttasks07:11:160
2986521160,2chrt29868-21fschecks_count09:21:280
1222821160,2chrt12229-21ld08:00:580
2450921140,3chrt24510-21/usr/sbin/munin12:27:120
1804021130,3chrt17944-21apt-get10:40:260
1735021120,2chrt17349-21/usr/sbin/munin09:50:500
37921110,2chrt380-21latency_hist12:40:070
1094821100,2chrt10949-21sleep12:06:430
1640821090,2sleep016409-21chrt09:49:250
143021090,1sleep01433-21switchtime11:52:190
235321080,2chrt2354-21awk11:05:340
1479521080,2chrt14794-21seq11:24:040
3077521070,3chrt30777-21sleep10:10:490
2771021070,2chrt27711-21sh08:25:530
706521060,2chrt7069-21irqrtprio12:01:040
866421030,2sleep08667-21grep09:37:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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