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2026-05-06 - 04:32

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Wed May 06, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3089023050,2sleep030891-21if_err_eth000:35:150
1318422510,3sleep013181-21ntpq21:20:200
3008122380,3sleep030079-21grep20:20:190
2832021400,4sleep028319-21sort22:20:020
1881521240,3chrt18816-21/usr/sbin/munin19:35:300
2606321210,3chrt26061-21forks20:05:160
673721200,3chrt6412-21/usr/sbin/munin20:55:240
1203421200,3sleep012035-21tr19:10:210
2352721120,4chrt23526-21ntpq22:00:240
42721110,3chrt428-21mailstats20:30:260
1698921000,4sleep016995-21df_inode19:30:130
108032910,3sleep010800-21cat21:10:260
299762844,9sleep029980-21ntp_states22:25:230
1106128122,34sleep011065-21users19:05:310
58682794,62sleep05871-21sshd20:51:380
285032784,62sleep028507-21ntp_states00:25:230
243582744,59sleep024359-21sshd19:58:370
85862705,8sleep0288-21snmpd21:02:360
299842680,4sleep029982-21cat00:30:270
219752600,3sleep021976-21munin-plugin-st19:50:000
1167199608,18cyclictest19162-21/usr/sbin/munin23:50:250
11671996036,15cyclictest18275-21/usr/sbin/munin23:45:270
11671996010,17cyclictest24784-21ntpq22:05:200
11671995928,21cyclictest24521-21/usr/sbin/munin00:10:180
11671995910,17cyclictest31108-21irqstats22:30:160
1167199588,18cyclictest10415-21ntpq23:15:240
11671995834,16cyclictest5093-21/usr/sbin/munin22:55:160
11671995833,15cyclictest27193-21/usr/sbin/munin00:20:210
11671995829,21cyclictest5029-21latency_hist20:50:010
11671995824,24cyclictest21216-21/usr/sbin/munin21:50:280
11671995811,16cyclictest19463-21/usr/sbin/munin21:45:150
11671995811,15cyclictest2423-21munin-run20:40:000
1167199579,18cyclictest7553-21/usr/sbin/munin23:05:210
1167199579,15cyclictest3952-21ntp_states22:50:220
1167199579,15cyclictest16783-21/usr/sbin/munin23:40:160
1167199579,14cyclictest17046-21ntp_states21:35:230
1167199578,17cyclictest18070-21/usr/sbin/munin21:40:170
1167199578,14cyclictest31146-21/usr/sbin/munin20:25:260
11671995735,13cyclictest2490-21/usr/sbin/munin22:45:150
11671995734,16cyclictest19585-21runrttasks19:40:110
11671995734,15cyclictest2203-21runrttasks22:44:380
11671995734,15cyclictest20834-21/usr/sbin/munin23:55:230
11671995733,16cyclictest25963-21/usr/sbin/munin22:10:170
11671995731,17cyclictest16064-21/usr/sbin/munin19:25:250
11671995731,16cyclictest25014-21/usr/sbin/munin20:00:230
11671995731,16cyclictest23128-21/usr/sbin/munin00:05:150
11671995711,18cyclictest28828-21ntp_states20:15:210
11671995710,16cyclictest32546-21ntp_states22:35:250
1167199568,15cyclictest21757-21/usr/sbin/munin00:00:200
1167199568,15cyclictest10235-21ls21:10:010
1167199568,14cyclictest13340-21ntp_states19:15:220
1167199567,17cyclictest28446-21/usr/sbin/munin22:20:110
11671995634,14cyclictest14303-21/usr/sbin/munin21:25:150
11671995633,14cyclictest27368-21/usr/sbin/munin20:10:140
11671995632,15cyclictest15336-21/usr/sbin/munin23:35:110
11671995631,15cyclictest12028-21/usr/sbin/munin23:20:280
11671995616,14cyclictest276-21runrttasks23:25:150
11671995610,15cyclictest26017-21find00:15:260
11671995610,15cyclictest23090-21munin-run22:00:010
11671995610,14cyclictest12696-21seq21:19:360
1167199558,18cyclictest288-21snmpd19:51:380
1167199558,14cyclictest14371-21/usr/sbin/munin19:20:140
11671995533,15cyclictest2608-21/usr/sbin/munin20:40:120
11671995531,15cyclictest15617-21/usr/sbin/munin21:30:150
1167199549,16cyclictest14190-21memory23:30:160
1167199539,18cyclictest9116-21ntp_states23:10:200
11671995328,15cyclictest6399-21/usr/sbin/munin23:00:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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