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2026-04-04 - 16:08

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 Sat Apr 04, 2026 12:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
351670,0ktimersoftd/32185-21perf06:59:173
872226261,0sleep00-21swapper/006:58:010
854223627,0sleep20-21swapper/206:55:552
849423223,0sleep10-21swapper/106:55:221
89179976,0cyclictest3514-21snmpd07:48:552
89179965,0cyclictest14231-21grep07:49:452
89169966,0cyclictest0-21swapper/109:04:501
89169960,0cyclictest0-21swapper/108:09:391
339960,0migration/329712-21sh09:50:113
339960,0migration/328365-21sh12:12:423
339960,0migration/321415-21sh10:47:163
339960,0migration/315784-21aten_r1power_cu09:24:373
339960,0migration/315186-21dump-pmu-power09:44:263
339960,0migration/312914-21runrttasks11:01:383
339960,0migration/311733-21sh12:21:483
29715060,0irq/26-eth0-rx-5657-21sh09:15:023
29715060,0irq/26-eth0-rx-30848-21irqstats11:54:423
29715060,0irq/26-eth0-rx-18524-21port_sshpriv12:24:453
19160,0ktimersoftd/17115-21diskmemload10:21:271
149960,0migration/021468-21sh11:08:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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