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2024-07-12 - 17:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 - 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 50 highest latencies:
System rackcslot8s.osadl.org (updated Thu Jul 11, 2024 12:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
109592670,1sleep341-21ksoftirqd/311:05:113
2804726233,6sleep20-21swapper/207:05:122
197122610,0sleep61210-21runrttasks10:31:576
125391610,6ptp4l0-21swapper/607:05:596
125391600,29ptp4l0-21swapper/107:09:021
125391580,5ptp4l0-21swapper/407:08:564
1389915532,7phc2sys0-21swapper/007:06:030
2960125232,6sleep70-21swapper/707:08:537
2943124937,7sleep30-21swapper/307:06:423
125391480,39ptp4l0-21swapper/507:09:435
125391360,0ptp4l0-21swapper/009:55:150
125391350,1ptp4l14528-21irqstats10:25:235
125391330,0ptp4l0-21swapper/412:25:144
125391320,1ptp4l21262-21ssh12:05:180
125391320,0ptp4l0-21swapper/410:20:084
125391320,0ptp4l0-21swapper/410:08:344
125391310,3ptp4l0-21swapper/410:25:364
125391310,0ptp4l0-21swapper/407:50:114
29962993027,2cyclictest14210-21awk11:10:001
125391300,0ptp4l0-21swapper/511:37:125
125391300,0ptp4l0-21swapper/508:00:155
125391300,0ptp4l0-21swapper/411:10:114
125391290,0ptp4l0-21swapper/711:08:427
125391290,0ptp4l0-21swapper/512:06:325
125391290,0ptp4l0-21swapper/511:16:245
125391290,0ptp4l0-21swapper/412:37:544
125391290,0ptp4l0-21swapper/310:16:023
125391290,0ptp4l0-21swapper/009:34:110
29962992826,1cyclictest21386-21idleruntime-cro11:20:001
125391280,0ptp4l0-21swapper/712:00:177
125391280,0ptp4l0-21swapper/409:15:234
125391280,0ptp4l0-21swapper/010:54:480
125391270,3ptp4l0-21swapper/112:05:141
125391270,0ptp4l0-21swapper/511:09:285
125391270,0ptp4l0-21swapper/510:05:505
125391270,0ptp4l0-21swapper/412:20:274
125391270,0ptp4l0-21swapper/410:44:404
125391270,0ptp4l0-21swapper/012:19:310
125391270,0ptp4l0-21swapper/011:55:180
125391270,0ptp4l0-21swapper/011:51:020
125391270,0ptp4l0-21swapper/011:06:010
125391270,0ptp4l0-21swapper/010:01:250
125391270,0ptp4l0-21swapper/009:00:420
125391260,1ptp4l24377-21sh11:23:320
125391260,0ptp4l0-21swapper/411:46:334
125391260,0ptp4l0-21swapper/411:26:204
125391260,0ptp4l0-21swapper/410:51:154
125391260,0ptp4l0-21swapper/410:18:594
125391260,0ptp4l0-21swapper/409:20:554
125391260,0ptp4l0-21swapper/312:31:573
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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