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2026-04-26 - 13:21

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 here to display the system's profile data or here to proceed to next system.
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 Apr 26, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
649121170,3sleep30-21swapper/323:27:203
108322770,2chrt10828-21ntpq23:37:260
108322770,2chrt10828-21ntpq23:37:260
63022740,3sleep30-21swapper/320:32:243
63022740,3sleep30-21swapper/320:32:243
185672720,3chrt0-21swapper/122:32:221
185672720,3chrt0-21swapper/122:32:221
8332660,3sleep30-21swapper/300:37:273
8332660,3sleep30-21swapper/300:37:273
178182660,3chrt17821-21fschecks_time23:57:201
178182660,3chrt17821-21fschecks_time23:57:201
178182660,3chrt17821-21fschecks_time23:57:201
8319996148,8cyclictest0-21swapper/000:02:130
8319996148,8cyclictest0-21swapper/000:02:130
8319996148,8cyclictest0-21swapper/000:02:130
266512580,3sleep126650-21tail21:27:221
266512580,3sleep126650-21tail21:27:221
266512580,3sleep126650-21tail21:27:221
168622560,3sleep10-21swapper/122:27:241
168622560,3sleep10-21swapper/122:27:241
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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