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2026-01-10 - 18:40

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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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 50 highest latencies:
System rack4slot6s.osadl.org (updated Sat Jan 10, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
243122570,3sleep02434-21modprobe10:00:000
1167821330,2sleep011677-21df_inode10:35:140
1599321190,3sleep015992-21pluginstate08:45:240
683721120,4sleep06446-21/usr/sbin/munin10:15:250
638921100,3chrt6390-21latency_hist10:15:010
544721090,5chrt5448-21mailstats12:15:270
3000521070,4sleep030037-21/usr/sbin/munin11:45:230
2636321060,4sleep026424-21users11:30:290
2652521030,4chrt26526-21cat09:25:270
592521020,4sleep05927-21sshd08:05:280
2245321020,4sleep022525-21sendmail_mailqu09:10:250
1134921000,3sleep011414-21latency_hist12:40:020
94112977,12sleep09412-21memory08:20:180
69102916,11sleep06914-21ntpq08:10:220
6472916,12sleep0724-21ls07:45:270
297742907,67sleep029746-21latency_hist09:40:010
90472875,9sleep09097-21df10:25:100
310392816,65sleep0114-21systemd-journal09:45:000
276432770,3sleep027641-21grep07:25:170
2256927718,34sleep022574-21ntp_states07:05:210
326372765,60sleep032646-21memory09:50:180
111892745,56sleep0288-21snmpd08:26:080
23480996636,22cyclictest28980-21/usr/sbin/munin07:30:200
23480996621,15cyclictest357-21/usr/sbin/munin11:55:270
2348099617,15cyclictest31057-21seq07:38:570
23480996112,16cyclictest31240-21/usr/sbin/munin09:45:130
23480996112,16cyclictest24547-21/usr/sbin/munin11:25:160
2348099599,16cyclictest26331-21irqstats07:20:160
13122590,2sleep01331-21missed_timers12:00:170
23480995821,13cyclictest276-21runrttasks12:25:410
23480995817,16cyclictest3537-21runrttasks12:09:470
23480995811,16cyclictest18744-21/usr/sbin/munin08:55:260
23480995811,16cyclictest13665-21/usr/sbin/munin08:35:290
2348099579,19cyclictest8067-21ntpq10:20:230
2348099579,17cyclictest31430-21/usr/sbin/munin11:50:250
2348099579,16cyclictest8874-21/usr/sbin/munin12:30:270
2348099578,17cyclictest16776-21/usr/sbin/munin10:55:110
23480995734,15cyclictest25020-21/usr/sbin/munin09:20:190
23480995734,14cyclictest1986-21/usr/sbin/munin07:50:270
23480995733,17cyclictest12120-21/usr/sbin/munin08:30:260
23480995733,16cyclictest21540-21runrttasks09:06:190
23480995732,16cyclictest15564-21/usr/sbin/munin10:50:140
2348099569,16cyclictest2597-21/usr/sbin/munin10:00:300
2348099569,16cyclictest24867-21/usr/sbin/munin07:15:260
2348099569,16cyclictest19375-21/usr/sbin/munin11:05:190
2348099569,14cyclictest31345-21/usr/sbin/munin07:40:260
2348099566,17cyclictest14388-21/usr/sbin/munin08:40:290
23480995633,14cyclictest14647-21/usr/sbin/munin10:45:260
23480995632,16cyclictest19593-21/usr/sbin/munin09:00:120
23480995632,15cyclictest22352-21/usr/sbin/munin11:15:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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