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2024-04-20 - 00:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #3

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 rackcslot3s.osadl.org (updated Fri Apr 19, 2024 12:50:25)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
254682516489,21sleep40-21swapper/407:07:554
253762514491,16sleep60-21swapper/607:06:376
255232512487,19sleep50-21swapper/507:08:445
253632481461,14sleep20-21swapper/207:06:242
253432438413,19sleep10-21swapper/107:06:071
254712430409,14sleep70-21swapper/707:07:597
254942364344,15sleep30-21swapper/307:08:193
255382336313,15sleep00-21swapper/007:08:550
2870621630,0sleep40-21swapper/410:40:124
1686021450,1sleep671-21ksoftirqd/612:30:126
26053996664,1cyclictest711-21tr08:30:140
26053996664,1cyclictest711-21tr08:30:140
26053996159,1cyclictest29173-21grep08:20:260
291702600,0sleep3421rcuc/308:20:263
217152580,0sleep50-21swapper/511:30:355
26059995755,1cyclictest6030-21grep11:00:166
2605899570,18cyclictest0-21swapper/507:30:135
26059995452,1cyclictest18637-21tr08:00:176
26058995452,1cyclictest1297-21tr10:50:145
26055995336,0cyclictest11291-21cpuspeed_turbos10:00:132
26053995222,1cyclictest280-21systemd-journal09:10:000
26060995048,1cyclictest1254-21tr10:50:157
26053995048,1cyclictest18755-21sh10:20:000
26060994644,1cyclictest15057-21grep09:00:157
26060994621,23cyclictest25045-21grep08:10:407
26059994644,1cyclictest15020-21timerandwakeup07:50:446
26059994644,1cyclictest1121-21sh09:40:006
26055994644,1cyclictest26004-21grep09:20:362
26058994544,0cyclictest18035-21sh10:15:005
2605699450,44cyclictest0-21swapper/307:30:143
26060994420,23cyclictest18314-21grep12:30:347
26059994443,0cyclictest16857-21turbostat.cron09:05:016
26058994442,1cyclictest29487-21sh11:50:015
26059994319,23cyclictest32545-21tr11:55:156
26054994341,1cyclictest12078-21cron08:55:001
26053994342,0cyclictest29662-21grep10:40:280
26060994240,1cyclictest26503-21grep10:35:137
26059994240,1cyclictest6535-21cpuspeed_turbos09:50:136
26058994239,2cyclictest7500-21tr12:10:145
26056994241,0cyclictest6563-21tr07:35:163
26054994239,2cyclictest11337-21tr10:00:131
26053994240,1cyclictest27031-21tr09:25:120
26060994139,1cyclictest16260-21cpuspeed_turbos10:10:147
26054994139,1cyclictest6008-21tr11:00:151
26060994022,17cyclictest24682-21tr09:20:137
26059994038,1cyclictest31374-21cpuspeed_turbos10:45:126
26054994038,1cyclictest23611-21grep08:10:141
26054994037,1cyclictest13577-21unixbench_multi12:20:391
26053994037,1cyclictest32201-21tail08:25:440
26060993937,1cyclictest31766-21cpuspeed_turbos09:35:127
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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