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2026-08-11 - 04:42

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Tue Aug 11, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3273522620,3sleep032734-21netstat21:10:200
2098621380,4chrt20983-21ntp_states22:30:220
435221250,4chrt4344-21ntp_states19:20:250
13479912210,16cyclictest1955-21sshd21:15:450
1526221210,3chrt15260-21wc00:15:020
1347991219,15cyclictest23677-21ntp_states20:35:220
1347991209,15cyclictest3027-21ntp_states19:15:260
13479912013,19cyclictest19694-21ntp_states22:25:230
1347991178,16cyclictest29978-21/usr/sbin/munin21:00:140
1347991177,14cyclictest6541-21df_inode21:35:140
1347991159,13cyclictest8948-21df_inode23:50:140
1347991159,13cyclictest6945-21/usr/sbin/munin19:30:260
1347991158,14cyclictest10358-21/usr/sbin/munin21:50:130
1347991158,13cyclictest10676-21memory19:45:170
13479911533,71cyclictest23361-21/usr/sbin/munin22:40:150
13479911517,14cyclictest323422chrt21:09:590
13479911510,13cyclictest288-21snmpd20:50:180
1347991149,18cyclictest18217-21ntp_states00:25:200
1347991149,17cyclictest276-21runrttasks00:09:180
1347991149,15cyclictest19481-21latency_hist20:20:020
1347991147,16cyclictest14959-21users20:00:300
1347991147,15cyclictest1440-21/usr/sbin/munin23:20:210
1347991146,14cyclictest8151-21/usr/sbin/munin19:35:170
13479911410,16cyclictest288-21snmpd19:13:210
1192021140,2sleep011921-21uname19:50:180
1347991139,19cyclictest2636-21memory23:25:190
1347991139,15cyclictest25087-21threads22:45:290
1347991139,15cyclictest22224-21ntpq22:35:170
1347991139,15cyclictest20873-21df20:25:100
1347991139,15cyclictest15475-21irqstats00:15:170
1347991137,15cyclictest29889-21cat23:05:180
13479911324,13cyclictest14303-21sh22:05:140
1347991129,18cyclictest5204-21/usr/sbin/munin21:30:300
1347991129,16cyclictest10166-21/usr/sbin/munin23:55:230
1347991129,13cyclictest9667-21users21:45:300
1347991128,15cyclictest1315-21latency_hist19:10:020
1347991127,14cyclictest114-21systemd-journal20:13:460
1347991127,13cyclictest29100-21chrt23:00:540
1347991127,12cyclictest11486-21/usr/sbin/munin00:00:140
1347991126,15cyclictest37122sleep021:24:260
13479911230,70cyclictest10262-21runrttasks19:44:140
13479911230,69cyclictest29254-21runrttasks20:55:550
13479911222,14cyclictest15642-21if_eth022:10:140
13479911220,14cyclictest276-21runrttasks21:57:480
13479911211,18cyclictest5292-21ntp_states23:35:210
13479911211,12cyclictest3977-21df_inode21:25:130
13479911210,18cyclictest17807-21chrt22:18:420
1347991119,18cyclictest32589-21ntp_states23:15:250
1347991119,15cyclictest13348-21ntp_states19:55:230
1347991119,11cyclictest254202sleep020:41:260
1347991118,14cyclictest317592sleep023:11:380
1347991117,23cyclictest276-21runrttasks22:55:270
1347991117,17cyclictest3883-21grep23:30:170
13479911131,68cyclictest5593-21/usr/sbin/munin19:25:220
1347991109,15cyclictest15714-21df20:05:140
1347991107,17cyclictest20779-21latency_hist20:25:010
1347991107,15cyclictest19894-21runrttasks00:31:060
13479911030,70cyclictest17191-21/usr/sbin/munin00:20:310
1347991099,17cyclictest22393-21ntp_states20:30:210
1347991099,16cyclictest18186-21df_inode22:20:140
1347991099,13cyclictest7855-21df_inode21:40:130
1347991098,13cyclictest7657-21df23:45:140
1347991088,15cyclictest20500-21/usr/sbin/munin00:35:160
1347991088,13cyclictest25903-21df22:50:140
1347991086,12cyclictest7481-21latency_hist23:45:010
1347991078,16cyclictest13236-21ntp_states22:00:220
13479910610,16cyclictest26031-21/usr/sbin/munin20:45:150
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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