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2026-05-12 - 17:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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.
Unexpectedly long latencies may be caused by SMIs
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 rack1slot2s.osadl.org (updated Tue May 12, 2026 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
234423626,0sleep30-21swapper/306:53:263
219423627,0sleep20-21swapper/206:51:372
3245823228,0sleep00-21swapper/006:51:110
242823119,0sleep10-21swapper/106:54:241
339960,0migration/3894-21irqcore11:56:053
339960,0migration/37697-21sh11:40:153
339960,0migration/323954-21sh09:47:033
339960,0migration/323582-21sh10:06:393
339960,0migration/316720-21sh09:44:233
339960,0migration/316123-21sh11:05:153
29725060,0irq/27-eth0-tx-2854-21munin-node06:56:120
29715060,0irq/26-eth0-rx-22241-21grep09:26:083
26399965,0cyclictest25594-21munin-node11:31:061
26399960,0cyclictest0-21swapper/111:36:191
26379960,0cyclictest0-21swapper/010:31:050
149960,0migration/025491-21idleruntime11:11:050
149960,0migration/015229-21sh10:21:240
149960,0migration/013931-21ntp_offset11:21:110
339950,0migration/39258-21taskset06:59:153
339950,0migration/38458-21aten_r1power_en11:21:033
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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