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2025-12-14 - 21:13

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 Sun Dec 14, 2025 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391760,38ptp4l0-21swapper/207:05:162
790526252,6sleep40-21swapper/407:05:204
111391600,29ptp4l0-21swapper/307:05:173
111391590,5ptp4l0-21swapper/707:08:267
819925534,6sleep60-21swapper/607:09:076
809525543,7sleep10-21swapper/107:07:501
1881915433,6phc2sys0-21swapper/507:07:195
795725039,6sleep00-21swapper/007:06:040
111391350,0ptp4l0-21swapper/010:00:210
111391320,0ptp4l0-21swapper/410:45:184
111391310,0ptp4l0-21swapper/409:45:174
111391300,0ptp4l0-21swapper/609:25:076
111391300,0ptp4l0-21swapper/410:00:214
111391300,0ptp4l0-21swapper/407:45:134
111391300,0ptp4l0-21swapper/008:25:150
111391290,0ptp4l0-21swapper/011:15:160
111391280,0ptp4l0-21swapper/411:09:094
111391280,0ptp4l0-21swapper/009:45:230
111391270,0ptp4l0-21swapper/408:40:184
111391270,0ptp4l0-21swapper/408:40:184
111391270,0ptp4l0-21swapper/009:25:200
111391260,0ptp4l0-21swapper/412:35:144
111391260,0ptp4l0-21swapper/410:05:184
111391260,0ptp4l0-21swapper/408:10:004
111391260,0ptp4l0-21swapper/011:40:160
111391260,0ptp4l0-21swapper/010:49:150
111391260,0ptp4l0-21swapper/008:30:180
111391250,0ptp4l0-21swapper/411:55:314
111391250,0ptp4l0-21swapper/012:10:130
111391250,0ptp4l0-21swapper/011:35:150
111391250,0ptp4l0-21swapper/011:10:210
111391250,0ptp4l0-21swapper/008:10:120
111391240,1ptp4l9017-21df_inode07:10:080
111391240,1ptp4l25678-21hddtemp_smartct07:45:120
111391240,1ptp4l23782-21netstat08:50:184
111391240,1ptp4l23277-21switchtime12:20:195
111391240,1ptp4l22590-21cpuspeed_turbos11:10:124
111391240,1ptp4l16199-21cpuspeed_turbos08:35:120
111391240,0ptp4l0-21swapper/411:53:534
111391240,0ptp4l0-21swapper/410:42:314
111391240,0ptp4l0-21swapper/410:35:004
111391240,0ptp4l0-21swapper/410:15:204
111391240,0ptp4l0-21swapper/410:13:534
111391240,0ptp4l0-21swapper/409:44:164
111391240,0ptp4l0-21swapper/409:07:544
111391240,0ptp4l0-21swapper/408:25:444
111391240,0ptp4l0-21swapper/408:20:124
111391240,0ptp4l0-21swapper/011:05:160
111391240,0ptp4l0-21swapper/009:35:170
111391240,0ptp4l0-21swapper/008:55:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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