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2024-11-23 - 17:11

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 20 highest latencies:
System rackbslot8s (updated Sat Nov 23, 2024 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
37446162131118,8sleep60-21swapper/607:09:226
37443712129114,10sleep20-21swapper/207:05:492
37443592127113,9sleep00-21swapper/007:05:400
37444012125117,5sleep50-21swapper/507:06:165
37445952123109,9sleep30-21swapper/307:09:033
37446172121106,10sleep70-21swapper/707:09:237
37445182119105,9sleep10-21swapper/107:07:581
37444182119105,9sleep40-21swapper/407:06:314
374491699111111,0cyclictest0-21swapper/709:34:217
374488799107100,3cyclictest573-21snmpd07:20:550
3744896991020,102cyclictest0-21swapper/209:27:302
3744916991010,99cyclictest0-21swapper/711:39:477
37449129910199,2cyclictest573-21snmpd11:02:516
37449129910199,2cyclictest573-21snmpd10:40:276
374491299101100,1cyclictest573-21snmpd09:16:236
3744912991010,99cyclictest0-21swapper/609:07:086
3744912991010,101cyclictest0-21swapper/610:02:476
37449089910199,2cyclictest573-21snmpd09:55:295
3744908991010,100cyclictest0-21swapper/512:14:375
37449059910198,3cyclictest573-21snmpd09:26:424
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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