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2026-07-25 - 07:46

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Sat Jul 25, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3038822750,3sleep030391-21ntp_kernel_pll_19:35:200
418922350,2sleep04187-21sendmail_mailst00:10:260
2985921330,3sleep029858-21entropy23:45:140
204021210,4chrt2041-21/usr/sbin/munin19:50:260
1336421210,2sleep013365-21wc20:35:190
1216721160,3chrt12168-21swap22:35:250
3050121120,4sleep030562-21users21:40:280
1964921100,4sleep019456-21/usr/sbin/munin23:05:190
2790921050,3sleep027973-21sendmail_mailst19:25:270
187062990,3sleep018704-21grep23:00:270
106562980,3sleep010673-21/usr/sbin/munin20:25:120
14282970,3sleep01471-21latency_hist19:50:010
69592900,3sleep07023-21switchtime22:15:260
133052890,4sleep013304-21ntp_states22:40:240
12672886,10sleep01295-21basename00:00:150
249162865,9sleep024920-21ntp_states23:25:210
180302867,66sleep018060-21ls23:00:020
94612840,4sleep09528-21/usr/sbin/munin22:25:250
41352817,61sleep04185-21df20:00:100
288032806,62sleep028505-21/usr/sbin/munin23:40:250
2250827320,31sleep022523-21irqstats19:05:170
70632690,3sleep07060-21ps20:10:250
69282660,3sleep06927-21grep00:20:280
23580996313,20cyclictest15061-21users20:40:280
242562620,3sleep024255-21sort19:10:280
23580996221,15cyclictest5841-21runrttasks22:10:290
23580996210,20cyclictest9244-21/usr/sbin/munin00:30:190
2358099619,18cyclictest20738-21/usr/sbin/munin23:10:130
2358099609,18cyclictest27527-21wc19:25:010
2358099608,18cyclictest11878-21/usr/sbin/munin20:30:260
23580996035,15cyclictest21028-21/usr/sbin/munin21:05:140
23580996018,15cyclictest32407-21df23:55:130
2358099599,18cyclictest23340-21/usr/sbin/munin23:20:190
23580995933,15cyclictest16003-21/usr/sbin/munin20:45:180
23580995910,16cyclictest9311-21/usr/sbin/munin20:20:150
2358099589,14cyclictest7997-21/usr/sbin/munin20:15:200
23580995834,16cyclictest23687-21/usr/sbin/munin21:15:180
23580995810,19cyclictest31445-21memory21:45:180
23580995810,15cyclictest2535-21munin-run22:00:000
294492573,5sleep00-21swapper21:36:590
2358099579,15cyclictest22021-21/usr/sbin/munin23:15:130
2358099578,18cyclictest1-21systemd20:51:170
2358099577,18cyclictest32541-21/usr/sbin/munin21:50:160
2358099577,15cyclictest25262-21open_files19:15:230
23580995735,15cyclictest26229-21runrttasks21:25:150
23580995732,16cyclictest24905-21/usr/sbin/munin21:20:140
23580995714,14cyclictest26872chrt00:05:210
23580995711,16cyclictest31256-21memory23:50:170
23580995710,15cyclictest5725-21chrt20:05:220
2358099568,16cyclictest10329-21df00:35:130
2358099568,15cyclictest8101-21/usr/sbin/munin22:20:200
2358099568,15cyclictest22465-21ntpq21:10:190
2358099568,15cyclictest14290-21/usr/sbin/munin22:45:160
2358099567,18cyclictest5101-21/usr/sbin/munin00:15:240
2358099567,16cyclictest19633-21/usr/sbin/munin21:00:130
23580995633,15cyclictest28215-21runrttasks21:32:210
23580995632,15cyclictest7765-21/usr/sbin/munin00:25:140
23580995632,15cyclictest28911-21/usr/sbin/munin19:30:140
23580995630,15cyclictest16178-21/usr/sbin/munin22:50:300
23580995610,13cyclictest4143-21/usr/sbin/munin22:05:160
2358099557,17cyclictest18322-21/usr/sbin/munin20:55:210
23580995531,15cyclictest2942-21/usr/sbin/munin22:00:200
23580995518,12cyclictest3999-21systemctl20:00:000
2358099549,17cyclictest31722-21ntp_states19:40:190
2358099549,15cyclictest27472-21ntp_states23:35:180
2358099548,14cyclictest10496-21fw_packets22:30:140
2358099538,15cyclictest26101-21memory23:30:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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