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2026-05-15 - 20:18

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 highest latencies:
System rack4slot6s.osadl.org (updated Fri May 15, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1047722460,2sleep010474-21cat09:35:010
30221230,3chrt32767-21irqstats08:55:140
2490821190,3chrt24911-21load10:30:160
267721150,4chrt2676-21/usr/sbin/munin11:10:130
1591621150,3chrt15919-21netstat09:55:180
842021050,4sleep08488-21grep09:25:270
888121017,13sleep08882-21sshd07:21:430
196962990,2sleep019699-21interrupts10:10:160
120872990,2sleep012088-21sendmail_mailtr11:45:260
109932960,4sleep011024-21/usr/sbin/munin07:30:250
273852950,4sleep027398-21/usr/sbin/munin10:40:150
143902910,3sleep014401-21cpu09:50:100
122462910,2sleep012247-21mailstats09:40:250
91602907,11sleep09189-21irqstats11:35:150
140912886,9sleep014131-21latency_hist11:55:020
106652877,66sleep010705-21memory09:35:180
108382860,3sleep010906-21timerandwakeup11:40:280
262992859,61sleep026303-21ntpq10:35:220
187762840,4sleep018846-21grep08:00:240
159852840,3sleep016042-21timerandwakeup12:00:280
185832810,2sleep018584-21cat12:10:270
449627922,32sleep04507-21ntp_states07:05:190
5427996428,15cyclictest15322-21runrttasks07:46:430
5427996324,14cyclictest23766-21irqstats08:20:160
5427996211,17cyclictest288-21snmpd10:05:280
5427996130,22cyclictest27693-21runrttasks08:35:180
542799609,17cyclictest288-21snmpd08:30:130
5427996035,16cyclictest5812-21runrttasks07:10:210
542799599,15cyclictest21975-21/usr/sbin/munin12:25:190
5427995934,16cyclictest14209-21/usr/sbin/munin11:55:100
542799589,18cyclictest21621-21vmstat08:10:270
542799589,15cyclictest29885-21/usr/sbin/munin10:50:120
542799589,15cyclictest20698-21/usr/sbin/munin12:20:170
542799588,18cyclictest288-21snmpd12:40:010
542799588,16cyclictest19737-21/usr/sbin/munin08:05:240
542799588,16cyclictest16989-21/usr/sbin/munin10:00:260
5427995810,19cyclictest4359-21ntpq09:10:220
5427995810,18cyclictest7443-21sshd07:15:430
5427995810,16cyclictest7189-21/usr/sbin/munin09:20:280
542799579,17cyclictest23444-21/usr/sbin/munin10:25:260
542799579,17cyclictest20891-21df10:15:100
542799579,16cyclictest17720-21/usr/sbin/munin07:55:290
5427995733,15cyclictest8806-21runrttasks11:34:060
5427995733,15cyclictest16291-21/usr/sbin/munin07:50:250
5427995732,17cyclictest28944-21/usr/sbin/munin08:40:180
5427995732,16cyclictest25791-21runrttasks08:27:490
5427995732,15cyclictest13155-21/usr/sbin/munin09:45:120
5427995731,16cyclictest22240-21/usr/sbin/munin10:20:140
5427995720,11cyclictest1309-21/usr/sbin/munin11:05:190
542799569,15cyclictest5194-21/usr/sbin/munin11:20:260
542799569,13cyclictest6485-21/usr/sbin/munin11:25:270
542799568,17cyclictest3879-21/usr/sbin/munin11:15:160
542799568,17cyclictest16922-21/usr/sbin/munin12:05:150
542799568,16cyclictest31439-21ntpq10:55:200
542799568,16cyclictest30066-21/usr/sbin/munin08:45:200
542799568,15cyclictest32529-21awk11:00:100
542799568,15cyclictest20558-21munin-run12:20:000
542799567,15cyclictest28607-21/usr/sbin/munin10:45:240
542799567,14cyclictest3336-21timerwakeupswit09:05:280
5427995632,16cyclictest5421-21/usr/sbin/munin09:15:140
5427995631,16cyclictest1765-21/usr/sbin/munin09:00:220
5427995611,17cyclictest31490-21irqstats08:50:170
5427995610,15cyclictest24425-21awk12:35:000
542799559,16cyclictest12040-21df_inode07:35:140
542799558,17cyclictest13286-21/usr/sbin/munin07:40:210
5427995510,17cyclictest22446-21irqstats08:15:160
542799548,14cyclictest9411-21/usr/sbin/munin07:25:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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