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2026-09-20 - 22:10

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 100 highest latencies:
System rack5slot7s.osadl.org (updated Sun Sep 20, 2026 12:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2127224482207,98sleep00-21swapper07:06:510
25259916636,110cyclictest9956-21latency_hist11:10:040
25259916229,20cyclictest0-21swapper07:31:010
25259915910,123cyclictest403-21apt-get10:16:360
25259915817,117cyclictest18340-21cat08:46:000
25259915815,100cyclictest16878-21munin-run08:40:020
25259915721,108cyclictest3230-21apt-get10:30:330
25259915720,106cyclictest29756-21apt-get09:55:170
25259915718,28cyclictest2469-21diskstats10:25:350
25259915716,25cyclictest22304-21cat12:25:070
25259915711,122cyclictest15745-21apt-config11:45:150
25259915616,115cyclictest20501-21apt-get09:00:270
25259915614,24cyclictest21408-21munin-run12:20:020
25259915611,124cyclictest8084-21apt-get11:01:060
25259915521,107cyclictest22368-21diskstats09:10:340
25259915514,118cyclictest3332-21munin-node07:15:130
25259915413,117cyclictest16882-21snmpd09:16:040
25259915412,40cyclictest16996-21/usr/sbin/munin08:40:250
25259915319,24cyclictest8156-21apt-get07:45:170
25259915316,108cyclictest31374-21apt-get10:05:180
25259915314,98cyclictest21464-21apt-get09:05:240
25259915311,117cyclictest8016-21head10:56:030
25259915310,117cyclictest24966-21/usr/sbin/munin09:25:240
25259915218,25cyclictest32342-21irqstats10:10:410
25259915217,39cyclictest20317-21munin-run09:00:060
25259915216,21cyclictest18665-21apt-get08:50:260
25259915216,109cyclictest22393-21apt-get12:25:270
25259915214,111cyclictest16685-21/usr/sbin/munin11:51:010
25259915213,23cyclictest16882-21snmpd09:30:260
25259915213,116cyclictest9376-21wc07:50:560
25259915133,96cyclictest14778-21latency_hist11:40:040
25259915131,24cyclictest4184-21apt-get10:35:210
25259915120,104cyclictest5798-21apt-get10:45:180
25259915118,24cyclictest28275-21df_inode09:45:310
25259915116,111cyclictest3319-21munin-run07:15:020
25259915115,111cyclictest9742-21/usr/sbin/munin07:56:010
25259915114,97cyclictest24042-21apt12:35:010
2525991509,116cyclictest12850-21latency_hist08:15:010
25259915033,21cyclictest30578-21apt-get10:00:120
25259915020,29cyclictest19895-21apt-get12:10:230
25259915019,103cyclictest18414-21diskstats12:00:320
25259915016,40cyclictest5043-21df07:25:250
25259915016,25cyclictest15219-21unixbench_singl08:26:040
25259915016,107cyclictest10565-21/usr/sbin/munin08:00:230
25259915015,24cyclictest13666-21munin-run08:20:020
25259915015,110cyclictest11756-21df11:20:240
25259915014,22cyclictest24846-21munin-run12:40:010
25259915013,114cyclictest18185-21munin-run12:00:020
25259915011,117cyclictest26767-21sort09:35:480
25259914918,105cyclictest6591-21apt-get10:50:180
25259914914,113cyclictest27329-21/usr/sbin/munin09:40:210
25259914913,98cyclictest2138-21cat10:21:080
25259914816,109cyclictest7239-21munin-run07:40:030
25259914814,26cyclictest29057-21df09:50:240
25259914812,113cyclictest13076-21grep11:26:030
25259914718,108cyclictest14963-21df11:40:260
25259914618,24cyclictest19208-21df_inode12:05:300
25259914617,26cyclictest7472-21diskstats07:40:330
25259914616,103cyclictest4891-21latency_hist07:25:040
25259914615,25cyclictest10820-21/usr/sbin/munin11:16:010
25259914514,107cyclictest13832-21timerwakeupswit11:31:020
25259914513,24cyclictest11464-21df08:05:280
25259914513,21cyclictest5099-21df10:40:250
25259914512,106cyclictest3454-21munin-node11:10:120
25259914414,18cyclictest13883-21df08:20:250
25259914413,23cyclictest16037-21who08:31:120
25259914313,108cyclictest24843-21sort09:25:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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