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2025-07-14 - 21:32

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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 rackbslot8s (updated Mon Jul 14, 2025 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17435012130119,7sleep50-21swapper/507:06:575
17435992123109,9sleep20-21swapper/207:08:212
17434962123109,9sleep00-21swapper/007:06:510
17436072120106,9sleep10-21swapper/107:08:281
17435832120106,9sleep40-21swapper/407:08:074
17436902118104,9sleep70-21swapper/707:09:397
17434052118103,10sleep30-21swapper/307:05:343
17434282117102,10sleep60-21swapper/607:05:536
17441349910499,5cyclictest1934547-21kworker/6:111:44:156
17441349910399,4cyclictest1803146-21kworker/6:209:58:016
174413499103102,1cyclictest1934547-21kworker/6:112:08:256
17441109910397,6cyclictest573-21snmpd11:43:071
1744139991020,100cyclictest0-21swapper/712:07:357
17441349910299,2cyclictest573-21snmpd10:24:106
17441349910298,4cyclictest1934547-21kworker/6:112:12:176
17441109910298,4cyclictest573-21snmpd07:38:341
17441109910298,3cyclictest573-21snmpd11:34:521
1744139991010,101cyclictest0-21swapper/711:44:107
1744139991010,101cyclictest0-21swapper/710:31:377
17441349910199,2cyclictest573-21snmpd12:35:366
17441349910199,2cyclictest573-21snmpd12:35:366
174413499101100,1cyclictest573-21snmpd08:08:206
174413499101100,1cyclictest1934547-21kworker/6:112:31:256
174413499101100,1cyclictest1934547-21kworker/6:112:31:256
174413499101100,1cyclictest1934547-21kworker/6:112:26:256
174413499101100,1cyclictest1934547-21kworker/6:112:21:136
174413499101100,1cyclictest1934547-21kworker/6:112:15:176
174413499101100,1cyclictest1934547-21kworker/6:112:02:176
174413499101100,1cyclictest1934547-21kworker/6:111:57:456
174413499101100,1cyclictest1934547-21kworker/6:111:50:196
174413499101100,1cyclictest1934547-21kworker/6:111:37:096
174413499101100,1cyclictest1855815-21kworker/6:011:25:416
174413499101100,1cyclictest1855815-21kworker/6:011:21:436
174413499101100,1cyclictest1855815-21kworker/6:011:17:416
174413499101100,1cyclictest1855815-21kworker/6:011:06:036
174413499101100,1cyclictest1855815-21kworker/6:011:00:396
174413499101100,1cyclictest1855815-21kworker/6:010:46:316
174413499101100,1cyclictest1855815-21kworker/6:010:39:296
174413499101100,1cyclictest1855815-21kworker/6:010:32:096
174413499101100,1cyclictest1855815-21kworker/6:010:15:156
174413499101100,1cyclictest1855815-21kworker/6:010:13:236
174413499101100,1cyclictest1803146-21kworker/6:209:53:196
174413499101100,1cyclictest1803146-21kworker/6:209:45:596
174413499101100,1cyclictest1803146-21kworker/6:209:40:176
174413499101100,1cyclictest1803146-21kworker/6:209:35:176
174413499101100,1cyclictest1803146-21kworker/6:209:31:116
174413499101100,1cyclictest1803146-21kworker/6:209:18:296
174413499101100,1cyclictest1803146-21kworker/6:209:11:296
174413499101100,1cyclictest1717816-21kworker/6:108:35:216
174413499101100,1cyclictest1717816-21kworker/6:107:40:276
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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