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2026-03-10 - 14:40

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 Tue Mar 10, 2026 12:43:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29187991918,1cyclictest65850irq/126-lan09:25:132
29187991918,1cyclictest65850irq/126-lan08:40:012
29187991818,0cyclictest65850irq/126-lan12:10:202
29187991818,0cyclictest65850irq/126-lan10:05:202
29187991817,1cyclictest65850irq/126-lan12:23:242
29187991817,1cyclictest65850irq/126-lan12:00:122
29187991817,1cyclictest65850irq/126-lan10:30:152
29187991817,1cyclictest65850irq/126-lan07:30:172
29181991818,0cyclictest743-21snmpd12:08:441
29181991818,0cyclictest743-21snmpd11:12:141
29181991818,0cyclictest743-21snmpd09:51:211
29181991818,0cyclictest743-21snmpd09:01:261
29187991717,0cyclictest65850irq/126-lan09:35:202
29187991717,0cyclictest65850irq/126-lan08:10:232
29187991716,1cyclictest65850irq/126-lan08:45:152
29187991716,1cyclictest65850irq/126-lan08:05:212
29187991716,1cyclictest65850irq/126-lan07:55:132
29187991716,1cyclictest65850irq/126-lan07:50:122
29187991716,1cyclictest65850irq/126-lan07:25:152
29181991717,0cyclictest743-21snmpd11:21:481
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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