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2026-03-30 - 02:52

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 Mon Mar 30, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1538523040,3sleep015389-21timerwakeupswit22:55:250
816022570,3sleep08156-21latency_hist00:35:020
105822480,3sleep01055-21find22:00:240
973121510,3sleep09733-21munin-plugin-st20:30:000
2821321320,2sleep028214-21cat19:35:140
3027721170,3sleep030280-21latency_hist23:55:010
2688121170,3chrt26880-21sendmail_mailqu23:40:250
2399721150,3sleep023999-21latency_hist21:25:020
3190021120,3chrt31902-21latency_hist19:50:010
2485521110,2chrt24858-21vmstat19:20:280
1551321110,4chrt15512-21wc20:50:260
2524221090,4chrt25240-21ls21:30:000
3037621080,4sleep030384-21df23:55:130
1762721010,3sleep017434-21/usr/sbin/munin23:05:180
188952967,13sleep018897-21/usr/sbin/munin21:05:110
178962946,12sleep017900-21ntp_states21:00:240
48202930,4sleep04885-21wc00:20:270
2089128525,34sleep020937-21users19:05:260
253152810,2sleep025316-21uname23:35:160
11682784,8sleep0288-21snmpd00:06:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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