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2026-07-20 - 22:39

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 Mon Jul 20, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2691622830,3sleep026915-21latency_hist10:50:010
1919821430,2sleep019200-21latency_hist10:20:030
2112321370,3chrt21121-21users10:25:320
1417021310,3sleep014171-21sed07:55:020
1707421290,4chrt17072-21grep10:10:250
2258521280,4chrt22583-21users08:25:320
271821140,2sleep02717-21ntp_offset09:15:220
1935021130,3sleep019348-21ntp_states12:25:230
787821100,3chrt7879-21sendmail_mailtr11:40:250
513921000,4sleep05143-21ntp_states11:30:240
74812960,3sleep07525-21latency_hist09:35:020
50312956,9sleep05081-21df09:25:110
37632900,2sleep03764-21sh07:14:590
324022896,10sleep032421-21ntp_states11:10:230
159432776,59sleep016009-21awk08:00:280
130927419,29sleep01360-21df07:05:130
319452678,45sleep0288-21snmpd09:03:050
250999617,18cyclictest11653-21/usr/sbin/munin07:45:200
80332600,2sleep08036-21cut09:35:270
250999609,19cyclictest25725-21/usr/sbin/munin08:40:020
250999609,16cyclictest14339-21ntpq10:00:200
250999607,16cyclictest21807-21/usr/sbin/munin10:30:160
2509996034,16cyclictest24735-21/usr/sbin/munin10:40:260
2509996033,18cyclictest16972-21/usr/sbin/munin12:15:280
250999599,16cyclictest8937-21munin-run07:35:010
250999599,15cyclictest38322sleep009:20:150
250999599,15cyclictest18102-21/usr/sbin/munin08:10:120
250999598,18cyclictest21617-21/usr/sbin/munin12:35:310
250999598,18cyclictest20338-21/usr/sbin/munin12:30:290
250999597,20cyclictest15051-21awk12:10:000
2509995935,14cyclictest14537-21/usr/sbin/munin07:55:240
2509995933,16cyclictest9237-21/usr/sbin/munin11:45:290
2509995913,17cyclictest6639-21cat11:35:280
2509995910,15cyclictest29772-21df_inode08:55:140
250999589,15cyclictest30906-21df11:05:130
250999589,15cyclictest27441-21ntpq08:45:240
250999588,17cyclictest307-21munin-node10:35:110
2509995834,15cyclictest29016-21runrttasks10:56:470
2509995834,15cyclictest23478-21/usr/sbin/munin08:30:190
2509995833,16cyclictest2367-21/usr/sbin/munin11:20:160
2509995832,18cyclictest27786-21runrttasks10:52:150
2509995828,18cyclictest17841-21/usr/sbin/munin12:20:140
2509995817,12cyclictest0-21swapper08:15:270
2509995810,17cyclictest8964-21df09:40:130
2509995810,17cyclictest32452-21/usr/sbin/munin09:05:160
250999579,18cyclictest19513-21ntpq10:20:200
250999579,16cyclictest11348-21df_inode11:55:150
250999579,15cyclictest1438-21ntp_states09:10:250
250999579,15cyclictest11473-21/usr/sbin/munin09:50:230
250999579,14cyclictest15463-21ntpq12:10:230
250999578,17cyclictest16818-21/usr/sbin/munin08:05:170
250999578,17cyclictest1462-21wc11:15:290
250999578,16cyclictest5401-21memory07:20:170
250999578,16cyclictest12756-21cpu09:55:110
250999577,17cyclictest9201-21/usr/sbin/munin07:35:140
250999577,17cyclictest12594-21/usr/sbin/munin12:00:180
2509995710,14cyclictest114-21systemd-journal11:54:140
250999568,18cyclictest4589-21sshd07:16:130
2509995632,16cyclictest7080-21/usr/sbin/munin07:25:250
2509995630,14cyclictest16438-21runrttasks10:09:260
250999559,15cyclictest285-21sshd08:42:120
250999557,16cyclictest29558-21/usr/sbin/munin11:00:250
2509995532,16cyclictest11331-21runrttasks07:43:280
2509995530,15cyclictest10252-21sshd09:45:130
2509995529,16cyclictest3707-21/usr/sbin/munin11:25:150
2509995510,17cyclictest28477-21df08:50:110
250999549,17cyclictest20704-21/usr/sbin/munin08:20:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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