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2025-05-02 - 12:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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.

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 rack7slot3s.osadl.org (updated Fri May 02, 2025 00:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2636521660,1sleep30-21swapper/321:30:453
3157299941,83cyclictest13798-21sed23:20:460
3157299931,72cyclictest26144-21/usr/sbin/munin22:55:350
3157299931,72cyclictest26144-21/usr/sbin/munin22:55:350
3157299921,76cyclictest0-21swapper/022:05:310
3157299911,80cyclictest8503-21latency_hist23:15:160
3157299891,79cyclictest11793-21/usr/sbin/munin19:45:450
3157299891,77cyclictest28696-21ntpq20:30:390
3157299891,77cyclictest0-21swapper/021:29:030
3157299891,71cyclictest7394-21ntp_kernel_pll_22:30:400
3157299881,74cyclictest19352-21ssh23:29:010
3157299881,73cyclictest0-21swapper/023:06:390
3157299871,77cyclictest0-21swapper/022:39:010
3157299871,77cyclictest0-21swapper/021:40:030
3157299871,75cyclictest2382-21rm22:25:060
3157299871,74cyclictest18247-21rm22:02:430
3157299871,72cyclictest0-21swapper/020:00:430
3157299871,72cyclictest0-21swapper/020:00:430
25672870,3sleep2301ktimersoftd/200:33:022
84082860,2sleep20-21swapper/221:05:322
3157299867,20cyclictest0-21swapper/021:20:330
3157299861,68cyclictest0-21swapper/022:47:410
3157299861,68cyclictest0-21swapper/000:09:380
3157299861,68cyclictest0-21swapper/000:09:380
3157299852,75cyclictest0-21swapper/019:16:000
3157299851,71cyclictest4196-21tune2fs00:35:350
3157299851,67cyclictest0-21swapper/021:45:440
305952850,5sleep20-21swapper/219:05:422
3157299841,72cyclictest5408-21runrttasks20:55:440
3157299841,69cyclictest12536-21sh00:01:290
3157299831,72cyclictest0-21swapper/023:53:140
3157299831,70cyclictest25135-21sh22:11:070
3157299831,70cyclictest25135-21sh22:11:070
3157299831,70cyclictest0-21swapper/022:00:150
3157299831,69cyclictest25997-21rm23:36:520
3157299831,69cyclictest25997-21rm23:36:520
3157299831,68cyclictest31070-21sh23:01:080
3157299831,66cyclictest19926-21wc20:05:460
3157299831,48cyclictest0-21swapper/019:55:160
3157299822,61cyclictest0-21swapper/021:15:340
3157299821,73cyclictest0-21swapper/021:34:350
3157299821,70cyclictest19362-21ps00:10:420
3157299821,69cyclictest9726-21ssh23:58:440
3157299821,68cyclictest0-21swapper/000:20:320
3157299812,67cyclictest0-21swapper/023:31:240
3157299811,69cyclictest0-21swapper/020:50:330
3157299811,65cyclictest31354-21sh23:45:030
3157299802,26cyclictest13702-21munin-run21:15:160
3157299801,71cyclictest17452-21sh22:44:330
3157299801,62cyclictest0-21swapper/000:25:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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