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2023-10-05 - 01:47

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 
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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 Thu Oct 05, 2023 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
291350580,0irq/25-eth10-21swapper/319:03:253
1594623524,0sleep00-21swapper/019:08:060
1586423227,0sleep20-21swapper/219:07:122
1581522925,0sleep10-21swapper/119:06:351
35170,0ktimersoftd/30-21swapper/322:18:293
339970,0migration/312300-21munin-node23:08:333
28415070,0irq/27-eth0-tx-0-21swapper/223:24:282
28415070,0irq/27-eth0-tx-0-21swapper/222:54:242
339960,0migration/33897-21sh21:59:453
339960,0migration/321208-21gltestperf22:33:293
28415060,0irq/27-eth0-tx-28544-21ssh21:55:272
28415060,0irq/27-eth0-tx-21818-21ssh00:34:192
28415060,0irq/27-eth0-tx-17215-21munin-node19:33:310
28415060,0irq/27-eth0-tx-0-21swapper/223:42:162
28415060,0irq/27-eth0-tx-0-21swapper/223:35:592
28415060,0irq/27-eth0-tx-0-21swapper/223:28:262
28415060,0irq/27-eth0-tx-0-21swapper/223:13:542
28415060,0irq/27-eth0-tx-0-21swapper/223:02:362
28415060,0irq/27-eth0-tx-0-21swapper/222:16:362
28415060,0irq/27-eth0-tx-0-21swapper/222:08:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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