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2026-06-26 - 07:06

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 Fri Jun 26, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2200523020,3sleep022004-21sed20:10:020
404422620,2sleep04042-21sendmail_mailtr23:10:270
763122420,2sleep07629-21ls21:20:020
1433222410,3sleep014331-21wc23:50:240
3124221620,3sleep031240-21proc_pri22:50:270
411021230,4chrt4111-21/usr/sbin/munin21:05:250
2263721190,3chrt22634-21vmstat20:10:290
763821160,4sleep07679-21memory23:25:180
1035321150,4chrt10355-21latency_hist19:25:010
3134621140,3sleep031345-21grep20:45:200
1138421070,4sleep011363-21/usr/sbin/munin23:40:110
1782221010,3sleep017819-21/usr/sbin/munin00:05:130
542121000,3sleep05425-21timerandwakeup23:15:280
160922920,4sleep015577-21/usr/sbin/munin19:45:260
196872880,3sleep019736-21systemctl22:05:290
6439998555,20cyclictest13047-21/usr/sbin/munin23:45:260
6439998355,15cyclictest2774-21ntp_states21:00:210
296632830,4sleep029696-21latency_hist20:40:020
6439998258,15cyclictest26718-21idleruntime-cro00:40:000
6439998153,14cyclictest20233-21chrt00:14:530
6439998050,17cyclictest30010-21/usr/sbin/munin22:45:250
6439997849,19cyclictest27195-21/usr/sbin/munin20:30:130
6439997848,16cyclictest25120-21sort20:20:250
6439997650,15cyclictest1945-21seq20:56:490
6439997649,15cyclictest12750-21ls21:40:010
6439997648,18cyclictest16579-21/usr/sbin/munin00:00:160
6439997550,14cyclictest8405-21chrt21:21:300
6439997550,14cyclictest23272-21/usr/sbin/munin00:25:210
6439997550,13cyclictest12928-21sort21:40:130
6439997548,14cyclictest30045-21/usr/sbin/munin20:40:170
6439997547,17cyclictest20995-21basename22:10:250
6439997450,14cyclictest15678-21ntpq21:50:210
6439997449,15cyclictest1763-21runrttasks23:01:290
6439997449,14cyclictest9852-21chrt23:34:250
6439997444,20cyclictest216-21rs:main0
6439997349,13cyclictest14958-21runrttasks21:47:250
6439997348,14cyclictest276-21runrttasks22:03:170
6439997347,14cyclictest23375-21df_inode20:15:130
6439997342,19cyclictest6507-21/usr/sbin/munin23:20:230
6439997244,15cyclictest7626-21chrt19:14:310
6439997238,19cyclictest32352-21/usr/sbin/munin20:50:130
6439997236,21cyclictest9255-21ntp_states21:25:240
6439997232,28cyclictest16948-21ntpq21:55:200
6439997149,13cyclictest26620-21runrttasks20:26:180
6439997146,15cyclictest821-21chrt22:59:410
6439997146,14cyclictest16386-21munin-run00:00:010
6439997143,19cyclictest14487-21/usr/sbin/munin19:40:170
6439997140,20cyclictest22441-21uptime22:15:290
6439997046,14cyclictest9001-21munin-run19:20:010
6439997045,14cyclictest2466-21seq23:05:170
6439997045,14cyclictest21758-21df00:20:140
6439997041,17cyclictest28327-21egrep22:40:090
6439997036,18cyclictest5264-21memory21:10:210
574527018,30sleep05820-21/usr/sbin/munin19:05:250
6439996946,14cyclictest10655-21/usr/sbin/munin21:30:250
6439996946,14cyclictest10420-21/usr/sbin/munin19:25:130
6439996944,14cyclictest24554-21/usr/sbin/munin00:30:220
6439996944,14cyclictest17532-21runrttasks19:51:010
6439996944,13cyclictest25427-21runrttasks22:28:330
6439996943,17cyclictest946-21ntpd19:35:210
6439996943,15cyclictest27199-21/usr/sbin/munin22:35:170
6439996943,14cyclictest20674-21ntp_states00:15:220
6439996939,16cyclictest26892-21latency_hist22:35:010
6439996934,22cyclictest11788-21/usr/sbin/munin19:30:130
6439996932,22cyclictest18213-21entropy19:55:130
6439996842,15cyclictest10245-21memory23:35:180
6439996835,21cyclictest19455-21/usr/sbin/munin20:00:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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