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2026-08-04 - 14:39

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 Tue Aug 04, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1508522520,3sleep015088-21sendmail_mailqu10:35:270
1221922220,2sleep012218-21sort08:20:020
1717921240,3sleep017175-21latency_hist10:45:000
1382721220,4chrt13825-21ntp_states08:25:250
2146821200,3sleep021471-21open_inodes11:00:250
625321190,3chrt6251-21users10:00:320
2401521190,3chrt24010-21ntp_states11:10:210
1201121180,4chrt12012-21/usr/sbin/munin12:30:160
2781021150,3chrt27809-21cat07:15:010
3042721120,3sleep030428-21cat09:30:150
1522421100,3sleep015290-21awk08:30:280
3057721040,2sleep030576-21awk11:35:270
1277121000,2sleep012835-21users08:20:290
291832980,3sleep029041-21/usr/sbin/munin09:25:190
70922960,2sleep07095-21wc10:05:150
306562930,3sleep030655-21wc07:25:180
69982916,9sleep07029-21ntpq12:10:200
109102895,11sleep010929-21ntp_states12:25:220
283252870,3sleep028323-21grep09:20:280
84412850,3sleep08443-21missed_timers10:10:190
6662846,64sleep0706-21if_err_eth007:35:160
288412740,2sleep028836-21latency_hist11:30:000
2560427320,30sleep025605-21ntp_states07:05:220
318072700,2sleep031808-21open_inodes11:40:260
44392680,3sleep04441-21ntp_kernel_err12:00:200
26515996426,15cyclictest10804-21munin-plugin-st08:15:010
82882630,2sleep08287-21ntp_kernel_err12:15:180
26515996225,13cyclictest23098-21timerandwakeup09:00:270
2651599618,27cyclictest20030-21memory10:55:190
26515996034,17cyclictest28798-21runrttasks07:17:540
2651599599,18cyclictest325-21sendmail09:40:010
2651599599,17cyclictest19972-21/usr/sbin/munin08:50:210
2651599599,17cyclictest17264-21munin-run08:40:010
2651599599,16cyclictest4475-21/usr/sbin/munin07:50:270
26515995910,17cyclictest1833-21df09:45:130
26515995832,16cyclictest18687-21/usr/sbin/munin08:45:100
26515995821,15cyclictest276-21runrttasks07:57:330
2651599578,17cyclictest26204-21sendmail-msp11:20:010
2651599578,15cyclictest8361-21/usr/sbin/munin08:05:170
26515995732,16cyclictest5514-21idleruntime-cro10:00:000
26515995711,15cyclictest26731-21ntp_states09:15:250
26515995710,16cyclictest288-21snmpd08:03:330
2651599569,20cyclictest23912-21df09:05:140
2651599569,16cyclictest31780-21/usr/sbin/munin07:30:150
2651599569,15cyclictest5581-21/usr/sbin/munin12:05:150
2651599569,15cyclictest1593-21/usr/sbin/munin11:50:290
2651599569,15cyclictest10832-21/usr/sbin/munin10:20:120
2651599569,14cyclictest3273-21/usr/sbin/munin07:45:160
2651599568,16cyclictest448-21/usr/sbin/munin09:40:260
2651599568,16cyclictest26328-21/usr/sbin/munin11:20:220
2651599568,15cyclictest17273-21/usr/sbin/munin10:45:270
2651599568,14cyclictest3063-21/usr/sbin/munin09:50:220
2651599567,16cyclictest2873-21seq07:43:280
26515995633,15cyclictest22513-21latency_hist09:00:030
26515995633,14cyclictest698-21/usr/sbin/munin11:45:240
26515995633,14cyclictest29462-21/usr/sbin/munin07:20:190
26515995631,15cyclictest12381-21/usr/sbin/munin10:25:210
26515995610,17cyclictest288-21snmpd10:18:010
26515995610,15cyclictest288-21snmpd12:00:010
26515995532,15cyclictest13653-21runrttasks10:30:190
26515995531,13cyclictest26308-21awk09:15:000
26515995529,17cyclictest28949-21df11:30:120
2651599549,17cyclictest18681-21if_eth010:50:150
2651599548,16cyclictest17405-21/usr/sbin/munin08:40:290
2651599548,15cyclictest9953-21chrt12:20:290
2651599547,15cyclictest13497-21ntp_states12:35:230
2651599547,13cyclictest22957-21/usr/sbin/munin11:05:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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