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2026-05-23 - 14:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot6s.osadl.org (updated Sat May 23, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
616222620,3sleep06160-21forks07:25:160
2853521540,2sleep028534-21timerandwakeup08:50:270
3195421230,4chrt31952-21df09:05:120
1369821180,3chrt13699-21sort12:05:190
2456221140,3chrt24556-21mailstats08:35:270
196421140,2sleep01965-21/usr/sbin/munin11:20:150
1781321110,3chrt17814-21ntp_states10:15:240
2168821100,3chrt21689-21/usr/sbin/munin12:35:270
510321010,3sleep05104-21ntp_states07:20:240
2108421000,2sleep021088-21sh12:35:000
4262980,3sleep0490-21latency_hist11:15:010
153092960,3sleep015326-21/usr/sbin/munin08:00:200
21982930,3sleep02205-21grep07:10:110
177152930,3sleep017781-21mailstats12:20:250
87242900,3sleep08766-21ntp_kernel_pll_09:40:200
46552890,3sleep04654-21wc11:30:200
303262860,3sleep030387-21wc11:05:010
204112845,9sleep020412-21ntp_states10:25:230
256442833,8sleep025703-21ntpq08:40:200
126662795,60sleep012731-21cat12:00:270
83762780,3sleep08393-21/usr/sbin/munin11:45:140
74772760,2sleep07476-21grep09:35:210
39842700,3sleep03986-21grep07:15:270
201226911,13sleep00-21swapper07:09:420
2099996629,27cyclictest22953-21/usr/sbin/munin10:35:240
2099996211,18cyclictest22860-21/usr/sbin/munin08:30:200
209999609,18cyclictest29354-21df08:55:130
209999608,22cyclictest12525-21/usr/sbin/munin07:50:140
2099996035,16cyclictest1024-21/usr/sbin/munin11:15:260
2099996034,16cyclictest7420-21/usr/sbin/munin07:30:110
2099996019,14cyclictest13918-21cat07:55:150
2099996010,16cyclictest26815-21awk08:45:140
209999599,19cyclictest26558-21/usr/sbin/munin10:50:140
209999598,16cyclictest14758-21/usr/sbin/munin12:10:240
209999597,18cyclictest3343-21/usr/sbin/munin09:20:200
2099995938,13cyclictest7147-21latency_hist09:35:010
2099995920,13cyclictest12352-21/usr/sbin/munin09:55:210
209999588,17cyclictest730-21/usr/sbin/munin09:10:190
209999588,17cyclictest10880-21/usr/sbin/munin11:55:270
2099995834,15cyclictest16176-21/usr/sbin/munin12:15:160
2099995833,16cyclictest9707-21/usr/sbin/munin11:50:150
209999579,14cyclictest17881-21memory08:10:200
209999577,17cyclictest19026-21chrt08:15:120
209999577,16cyclictest30612-21/usr/sbin/munin09:00:230
209999577,16cyclictest21577-21/usr/sbin/munin08:25:200
2099995733,15cyclictest11725-21/usr/sbin/munin07:45:270
2099995711,16cyclictest15114-21/usr/sbin/munin10:05:170
2099995710,16cyclictest30440-21/usr/sbin/munin11:05:200
2099995710,14cyclictest25278-21/usr/sbin/munin10:45:170
209999569,15cyclictest20396-21/usr/sbin/munin08:20:140
209999569,14cyclictest23991-21/usr/sbin/munin10:40:280
209999568,17cyclictest2019-21/usr/sbin/munin09:15:140
209999568,16cyclictest13662-21/usr/sbin/munin10:00:160
209999567,16cyclictest4628-21/usr/sbin/munin09:25:150
209999567,16cyclictest18838-21/usr/sbin/munin10:20:310
209999567,15cyclictest9912-21cat07:40:030
2099995632,15cyclictest11927-21runrttasks09:52:360
2099995631,15cyclictest16994-21/usr/sbin/munin08:05:290
2099995610,14cyclictest17394-21munin-run10:15:010
209999559,18cyclictest10179-21sort07:40:190
209999559,16cyclictest7300-21ntpq11:40:200
209999559,16cyclictest21658-21awk10:30:210
209999558,16cyclictest19088-21awk12:25:260
2099995525,22cyclictest5773-21runrttasks11:35:120
2099995510,17cyclictest10946-21munin-run09:50:000
209999548,16cyclictest3155-21/usr/sbin/munin11:25:120
2099995431,15cyclictest28621-21runrttasks10:56:570
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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