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2023-10-04 - 09:37

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #a, slot #8

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 rackaslot8s.osadl.org (updated Wed Oct 04, 2023 00:45:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
209652194179,9sleep10-21swapper/119:09:311
207922180108,28sleep20-21swapper/219:07:152
208922163105,31sleep00-21swapper/019:08:330
207782163109,29sleep30-21swapper/319:07:043
102242780,2sleep30-21swapper/300:25:293
78702610,3sleep00-21swapper/023:54:000
164772580,6sleep2281ksoftirqd/221:16:032
18882540,1sleep00-21swapper/023:48:590
208052520,2sleep020804-21ssh23:10:260
155422510,2sleep20-21swapper/221:44:362
225362480,2sleep30-21swapper/323:39:263
242352460,1chrt23772-21/usr/sbin/munin23:40:252
242352460,1chrt23772-21/usr/sbin/munin23:40:252
118902420,1sleep10-21swapper/122:09:271
206482400,1sleep00-21swapper/022:43:570
11252390,2sleep00-21swapper/023:20:330
84622370,11chrt22-21ksoftirqd/123:54:411
82072300,2sleep20-21swapper/223:26:412
2146899303,19cyclictest12885-21ssh22:10:203
2146599273,17cyclictest4400-21ssh22:30:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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