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2026-01-01 - 07:51

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 Thu Jan 01, 2026 00:43:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
5586991818,0cyclictest743-21snmpd23:54:402
5586991818,0cyclictest743-21snmpd23:34:152
5586991818,0cyclictest743-21snmpd22:54:382
5586991818,0cyclictest743-21snmpd22:32:132
5586991818,0cyclictest743-21snmpd22:06:572
5586991818,0cyclictest743-21snmpd22:01:152
5586991818,0cyclictest743-21snmpd20:02:582
5586991818,0cyclictest743-21snmpd19:55:112
5586991818,0cyclictest743-21snmpd19:49:102
5586991818,0cyclictest743-21snmpd19:27:372
5586991818,0cyclictest22691-21cat21:10:142
5577991818,0cyclictest65850irq/126-lan22:53:340
5577991818,0cyclictest65850irq/126-lan21:40:220
5577991818,0cyclictest65850irq/126-lan19:35:560
5577991817,1cyclictest65850irq/126-lan20:45:180
5577991817,1cyclictest65850irq/126-lan00:20:180
5586991717,0cyclictest743-21snmpd23:39:422
5586991717,0cyclictest743-21snmpd22:55:412
5586991717,0cyclictest743-21snmpd22:19:222
5586991717,0cyclictest743-21snmpd21:27:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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