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2026-03-31 - 02:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #5

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 rack0slot5s.osadl.org (updated Tue Mar 31, 2026 00:45:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15344752356330,17sleep140-21swapper/146
15344622350309,15sleep20-21swapper/28
15345212349325,16sleep60-21swapper/612
15344462347322,17sleep50-21swapper/511
15345362343317,17sleep40-21swapper/410
15343192343320,14sleep120-21swapper/124
15345392341315,17sleep70-21swapper/713
15344872341321,12sleep90-21swapper/915
15344542341317,15sleep130-21swapper/135
15343032340315,16sleep30-21swapper/39
15344712338294,35sleep100-21swapper/102
15343642338312,17sleep10-21swapper/11
15345952337311,17sleep80-21swapper/814
15344722336311,16sleep110-21swapper/113
15343612336310,17sleep150-21swapper/157
15344782334311,15sleep00-21swapper/00
153500299521,26cyclictest1814626-31munin-graph7
18020432490,0sleep20-21swapper/28
1534972994240,1cyclictest1608-21snmpd14
153500299390,25cyclictest0-21swapper/157
1534962993939,0cyclictest0-21swapper/612
1534962993939,0cyclictest0-21swapper/612
1534959993939,0cyclictest0-21swapper/511
1534936993937,1cyclictest1608-21snmpd0
1535002993822,16cyclictest1955757-21tr7
1534936993838,0cyclictest0-21swapper/00
1534980993737,0cyclictest0-21swapper/102
1534980993737,0cyclictest0-21swapper/102
153500299360,11cyclictest0-21swapper/157
153500299360,11cyclictest0-21swapper/157
153500299350,11cyclictest0-21swapper/157
1535002993410,13cyclictest0-21swapper/157
1534967993434,0cyclictest0-21swapper/713
1534936993434,0cyclictest0-21swapper/00
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
153500299326,11cyclictest0-21swapper/157
1535002993232,0cyclictest0-21swapper/157
1534962993232,0cyclictest0-21swapper/612
1534942993232,0cyclictest0-21swapper/28
1534942993232,0cyclictest0-21swapper/28
1534959993131,0cyclictest0-21swapper/511
153499399308,1cyclictest0-21swapper/135
1534993993029,1cyclictest1608-21snmpd5
1534987993030,0cyclictest0-21swapper/124
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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