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2026-06-24 - 04:18

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 Wed Jun 24, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
844522530,4sleep08446-21latency_hist22:10:020
414422150,3sleep04145-21awk19:45:270
2882821410,3sleep028827-21cat19:15:280
853421250,3chrt8536-21ls00:15:170
486221190,2sleep04861-21memory21:55:220
1404221180,4chrt14045-21open_inodes22:30:260
1792221130,2sleep017921-21pluginstate22:45:240
1804221070,2sleep018041-21awk20:40:210
2023221060,3sleep020269-21if_eth022:55:150
894521000,3sleep08996-21mailstats22:10:250
76712980,4sleep07685-21awk00:10:280
232762965,14sleep023338-21sendmail_mailst21:00:250
116822950,4sleep011746-21mailstats20:15:230
2597529415,63sleep00-21swapper19:05:220
320142910,2sleep032016-21sh19:30:000
102312900,3sleep010275-21users00:20:300
308322894,10sleep030871-21load21:30:180
268512886,10sleep026854-21df21:15:130
101562860,3sleep010194-21processes22:15:300
65642848,12sleep0288-21snmpd00:06:490
324152826,64sleep032426-21ntp_states19:30:200
256772780,2sleep025679-21sed21:10:200
26874996137,16cyclictest1083-21/usr/sbin/munin21:40:190
26874996129,21cyclictest19335-21/usr/sbin/munin20:45:200
248922613,5sleep00-21swapper23:12:310
26874996034,17cyclictest4657-21/usr/sbin/munin00:00:170
26874996011,17cyclictest29453-21/usr/sbin/munin21:25:120
2687499599,16cyclictest7291-21cat20:00:000
26874995911,15cyclictest32163-21memory21:35:230
26874995911,15cyclictest12729-21/usr/sbin/munin00:30:280
2687499589,14cyclictest26831-21load23:20:170
2687499588,15cyclictest30495-21/usr/sbin/munin23:35:150
2687499587,19cyclictest14046-21grep00:35:270
26874995835,15cyclictest9037-21/usr/sbin/munin20:05:230
26874995834,16cyclictest17266-21runrttasks22:43:240
26874995833,16cyclictest21906-21/usr/sbin/munin23:00:260
26874995817,16cyclictest2069-21runrttasks19:39:390
26874995812,17cyclictest28137-21idleruntime-cro19:15:000
2687499579,16cyclictest7435-21/usr/sbin/munin20:00:390
2687499579,14cyclictest2274-21/usr/sbin/munin19:40:280
2687499578,19cyclictest21620-21/usr/sbin/munin20:55:220
2687499578,16cyclictest20336-21/usr/sbin/munin20:50:260
2687499578,16cyclictest10007-21/usr/sbin/munin20:10:300
2687499578,15cyclictest198302chrt22:53:230
2687499577,20cyclictest2592-21cat21:45:270
26874995734,14cyclictest24302-21/usr/sbin/munin21:05:150
26874995733,16cyclictest31985-21/usr/sbin/munin23:40:160
26874995732,16cyclictest29275-21df_inode23:30:120
26874995731,15cyclictest6744-21runrttasks22:01:450
26874995719,12cyclictest14999-21/usr/sbin/munin22:35:140
2687499569,16cyclictest28200-21/usr/sbin/munin23:25:210
2687499568,15cyclictest25569-21/usr/sbin/munin23:15:190
26874995632,15cyclictest2246-21/usr/sbin/munin23:50:240
26874995629,15cyclictest29861-21/usr/sbin/munin19:20:200
26874995611,15cyclictest12923-21ntpq20:20:320
116072563,6sleep00-21swapper00:25:460
2687499559,16cyclictest4838-21/usr/sbin/munin19:50:280
2687499559,14cyclictest3262-21df_inode23:55:150
2687499558,16cyclictest3382-21/usr/sbin/munin21:50:430
26874995531,15cyclictest792-21/usr/sbin/munin23:45:200
26874995530,17cyclictest11317-21/usr/sbin/munin22:20:180
2687499549,16cyclictest16457-21/usr/sbin/munin20:35:160
26874995430,16cyclictest14483-21/usr/sbin/munin20:25:300
26874995429,16cyclictest23904-21runrttasks23:09:580
26874995428,17cyclictest13365-21runrttasks22:28:100
26874995411,17cyclictest15574-21find20:30:260
2687499539,16cyclictest28561-21which21:20:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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