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2025-11-27 - 08:29

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 Thu Nov 27, 2025 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1717323728,0sleep10-21swapper/118:34:321
2342823626,0sleep30-21swapper/318:38:183
2324323422,0sleep00-21swapper/018:36:110
2317023425,0sleep20-21swapper/218:35:172
28415070,0irq/27-eth0-tx-0-21swapper/020:39:430
149970,0migration/023012-21ntp_offset22:24:460
339960,0migration/38564-21taskset21:15:083
339960,0migration/331449-21munin-node19:29:493
339960,0migration/325081-21sh20:47:003
339960,0migration/315810-21sh23:44:363
28415060,0irq/27-eth0-tx-32450-21munin-node19:34:390
28415060,0irq/27-eth0-tx-25017-21ssh20:46:502
28415060,0irq/27-eth0-tx-0-21swapper/223:57:442
28415060,0irq/27-eth0-tx-0-21swapper/223:30:012
28415060,0irq/27-eth0-tx-0-21swapper/223:13:162
28415060,0irq/27-eth0-tx-0-21swapper/223:06:452
28415060,0irq/27-eth0-tx-0-21swapper/222:54:442
28415060,0irq/27-eth0-tx-0-21swapper/222:49:372
28415060,0irq/27-eth0-tx-0-21swapper/222:49:162
28415060,0irq/27-eth0-tx-0-21swapper/222:30:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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