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2026-01-12 - 12:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, 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.
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 50 highest latencies:
System rack8slot6s.osadl.org (updated Mon Jan 12, 2026 00:43:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30964991918,1cyclictest65850irq/126-lan21:05:110
30964991817,1cyclictest65850irq/126-lan23:15:160
30964991817,1cyclictest65850irq/126-lan23:10:520
30964991817,1cyclictest65850irq/126-lan22:45:170
30964991817,1cyclictest65850irq/126-lan22:40:170
30964991817,1cyclictest65850irq/126-lan22:30:150
30964991817,1cyclictest65850irq/126-lan00:25:140
30964991717,0cyclictest65850irq/126-lan23:05:190
30964991717,0cyclictest65850irq/126-lan19:35:110
30964991716,1cyclictest65850irq/126-lan22:00:160
30964991716,1cyclictest65850irq/126-lan21:51:230
30964991716,1cyclictest65850irq/126-lan21:40:160
30964991716,1cyclictest65850irq/126-lan21:25:180
30964991716,1cyclictest65850irq/126-lan21:10:010
30964991716,1cyclictest65850irq/126-lan20:25:140
30964991716,1cyclictest65850irq/126-lan19:47:040
30964991716,1cyclictest65850irq/126-lan19:10:150
30964991716,1cyclictest65850irq/126-lan00:05:110
30964991616,0cyclictest65850irq/126-lan22:08:480
30964991616,0cyclictest65850irq/126-lan21:30:180
30964991616,0cyclictest65850irq/126-lan20:10:280
30964991616,0cyclictest65850irq/126-lan20:00:120
30964991616,0cyclictest65850irq/126-lan19:44:240
30964991615,1cyclictest65850irq/126-lan23:45:160
30964991615,1cyclictest65850irq/126-lan21:20:170
30964991615,1cyclictest65850irq/126-lan20:30:130
30964991615,1cyclictest65850irq/126-lan20:15:120
30964991615,1cyclictest65850irq/126-lan19:30:140
30964991615,1cyclictest65850irq/126-lan00:35:180
30964991615,1cyclictest65850irq/126-lan00:03:410
30964991515,0cyclictest65850irq/126-lan20:45:440
30964991514,1cyclictest65850irq/126-lan23:35:170
30964991514,1cyclictest65850irq/126-lan22:35:150
30964991514,1cyclictest65850irq/126-lan22:10:210
30964991514,1cyclictest65850irq/126-lan21:00:120
30964991414,0cyclictest65850irq/126-lan22:21:010
30964991414,0cyclictest65850irq/126-lan21:00:010
30964991414,0cyclictest65850irq/126-lan20:40:240
30964991414,0cyclictest65850irq/126-lan20:40:240
30964991414,0cyclictest65850irq/126-lan19:55:120
30964991414,0cyclictest65850irq/126-lan00:20:200
30964991413,1cyclictest65850irq/126-lan22:25:130
30964991413,1cyclictest65850irq/126-lan19:50:150
30964991413,1cyclictest65850irq/126-lan00:10:130
30964991313,0cyclictest65850irq/126-lan23:57:570
30964991313,0cyclictest65850irq/126-lan23:51:450
30964991313,0cyclictest65850irq/126-lan21:15:160
30964991313,0cyclictest65850irq/126-lan19:20:150
30964991313,0cyclictest65850irq/126-lan00:30:220
30964991313,0cyclictest65850irq/126-lan00:19:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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