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2026-05-03 - 13:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot1s.osadl.org (updated Sun May 03, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
881821140,2sleep08820-21fschecks_count21:17:270
881821140,2sleep08820-21fschecks_count21:17:270
1615221120,4sleep00-21swapper/023:02:280
1615221120,4sleep00-21swapper/023:02:280
3154021050,3sleep00-21swapper/020:52:150
294392980,2chrt29441-21fschecks_count22:12:270
57492650,4sleep05753-21cpuspeed00:02:250
57492650,4sleep05753-21cpuspeed00:02:250
57492650,4sleep05753-21cpuspeed00:02:250
34052620,1sleep13408-21sed21:02:291
34052620,1sleep13408-21sed21:02:291
34052620,1sleep13408-21sed21:02:291
55402560,3sleep00-21swapper/000:02:170
55402560,3sleep00-21swapper/000:02:170
160382540,3sleep00-21swapper/020:07:370
299632440,2sleep129253-21/usr/sbin/munin22:12:331
181732390,4sleep118176-21unixbench_singl00:32:371
181732390,4sleep118176-21unixbench_singl00:32:371
306562380,3sleep30-21swapper/320:47:363
27080993829,7cyclictest10716-21netstat22:47:321
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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