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2026-07-19 - 15:42

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 20 highest latencies:
System rack8slot6s.osadl.org (updated Sun Jul 19, 2026 12:43:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3447991818,0cyclictest743-21snmpd11:40:200
3447991818,0cyclictest65850irq/126-lan10:20:140
3447991818,0cyclictest65850irq/126-lan09:47:430
3447991818,0cyclictest16582-21cat10:15:130
3447991817,1cyclictest65850irq/126-lan12:29:200
3447991817,1cyclictest65850irq/126-lan09:00:130
3447991817,1cyclictest65850irq/126-lan08:15:100
3451991717,0cyclictest743-21snmpd12:01:231
3451991717,0cyclictest743-21snmpd11:54:541
3451991717,0cyclictest743-21snmpd11:42:351
3451991717,0cyclictest743-21snmpd11:34:131
3451991717,0cyclictest743-21snmpd11:22:531
3451991717,0cyclictest743-21snmpd10:21:441
3451991717,0cyclictest743-21snmpd09:17:471
3451991717,0cyclictest743-21snmpd09:04:081
3451991717,0cyclictest743-21snmpd08:40:201
3451991717,0cyclictest29131-21cat10:45:151
3447991717,0cyclictest743-21snmpd11:05:490
3447991717,0cyclictest743-21snmpd10:44:410
3447991717,0cyclictest743-21snmpd10:03:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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