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2025-11-09 - 15:48

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 Sun Nov 09, 2025 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1772921510,4chrt17728-21netstat11:35:200
51821400,3chrt519-21sshd08:23:280
3070621330,4chrt30705-21/usr/sbin/munin12:25:210
1685621300,3chrt16857-21/usr/sbin/munin07:20:270
2962721050,4sleep029691-21awk10:15:280
1158721040,4sleep011647-21mailstats09:05:300
1268421020,3sleep012726-21/usr/sbin/munin07:05:160
488021000,4sleep04887-21awk10:45:260
2079421000,3sleep020795-21sshd11:46:150
89032950,2sleep08906-21cut11:00:300
74742920,2sleep07473-21memory08:50:180
217942880,3sleep021811-21/usr/sbin/munin07:40:180
173682870,3sleep017399-21cat11:35:010
142012814,8sleep014269-21/usr/sbin/munin09:15:280
193532745,57sleep019352-21ntp_states07:30:220
50032630,2sleep05002-21ntp_offset08:40:240
13747996311,18cyclictest14693-21sshd07:12:280
13747996210,18cyclictest15078-21/usr/sbin/munin09:20:210
13747996137,15cyclictest32360-21/usr/sbin/munin10:25:290
13747996111,17cyclictest22189-21snmpd10:40:180
1374799609,17cyclictest10133-21ntpq09:00:210
1374799609,14cyclictest18934-21/usr/sbin/munin09:35:260
1374799608,16cyclictest27985-21/usr/sbin/munin10:10:200
1374799607,19cyclictest6001-21/usr/sbin/munin08:45:120
1374799598,20cyclictest26740-21load12:10:160
13747995931,19cyclictest23487-21sshd09:51:010
1374799589,16cyclictest23003-21df07:45:140
1374799589,16cyclictest21797-21/usr/sbin/munin09:45:220
1374799588,22cyclictest27843-21/usr/sbin/munin12:15:160
1374799588,18cyclictest22966-21seq11:55:240
1374799588,16cyclictest3673-21ntpq08:35:200
1374799588,16cyclictest31731-21/usr/sbin/munin12:30:160
1374799587,18cyclictest12324-21/usr/sbin/munin11:15:210
1374799587,16cyclictest25764-21/usr/sbin/munin07:55:200
13747995812,20cyclictest7741-21users10:55:300
13747995811,15cyclictest29161-21/usr/sbin/munin12:20:120
13747995810,15cyclictest24041-21df_inode12:00:140
1374799579,19cyclictest29089-21sshd08:08:280
1374799579,16cyclictest20512-21grep09:40:210
1374799578,16cyclictest9803-21latency_hist09:00:020
1374799578,16cyclictest25851-21/usr/sbin/munin10:00:280
1374799578,16cyclictest20352-21/usr/sbin/munin07:35:180
1374799578,15cyclictest24237-21/usr/sbin/munin07:50:250
13747995734,14cyclictest2393-21/usr/sbin/munin08:30:200
13747995711,17cyclictest30647-21df10:20:130
13747995711,15cyclictest19101-21ntp_states11:40:240
13747995710,16cyclictest30746-21df08:15:130
13747995710,16cyclictest29702-21ntp_states08:10:250
14492563,8sleep00-21swapper10:31:390
1374799569,18cyclictest10909-21cron11:10:010
1374799569,15cyclictest1989-21/usr/sbin/munin10:35:240
1374799569,14cyclictest15127-21/usr/sbin/munin07:15:130
1374799568,18cyclictest26787-21/usr/sbin/munin10:05:160
1374799568,15cyclictest25272-21/usr/sbin/munin12:05:170
1374799568,14cyclictest12657-21memory09:10:190
1374799567,18cyclictest21388-21/usr/sbin/munin11:50:220
1374799567,16cyclictest11036-21/usr/sbin/munin11:10:150
13747995615,14cyclictest17965-21netstat07:25:200
13747995610,15cyclictest608-21df12:35:140
1374799559,16cyclictest1522-21seq08:26:080
1374799558,16cyclictest14255-21/usr/sbin/munin11:20:310
1374799558,14cyclictest24241-21irqstats09:55:180
1374799558,14cyclictest17707-21/usr/sbin/munin09:30:130
1374799558,14cyclictest16642-21ntp_states09:25:220
1374799557,15cyclictest15245-21open_files11:25:240
13747995510,15cyclictest16707-21rs:main0
1374799549,17cyclictest26958-21if_eth008:00:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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