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2026-07-29 - 23:44

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 Wed Jul 29, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3184022590,2sleep031839-21sort10:30:270
1104022590,3sleep011039-21sort11:15:270
3076522460,2sleep030768-21timerandwakeup08:20:270
1861121690,3sleep018610-21wc11:45:270
2657921360,3sleep026577-21grep08:05:200
120529912628,17cyclictest24959-21/usr/sbin/munin12:10:210
1555121230,3chrt15544-21munin-run11:35:000
120529912124,15cyclictest1617-21/usr/sbin/munin10:40:140
12052991207,15cyclictest25072-21/usr/sbin/munin08:00:180
1207821190,3chrt12079-21/usr/sbin/munin09:15:140
12052991188,24cyclictest18736-21ntp_states09:40:220
120529911811,17cyclictest15769-21wc09:30:010
12052991178,17cyclictest288-21snmpd12:00:010
120529911725,15cyclictest647-21/usr/sbin/munin10:35:280
2741421160,4chrt27413-21sort10:15:010
120529911628,15cyclictest16930-21runrttasks09:34:230
120529911624,14cyclictest4074-21runrttasks08:44:510
120529911527,16cyclictest30620-21runrttasks12:31:410
120529911527,15cyclictest15322-21runrttasks07:20:290
120529911525,16cyclictest946-21ntpd09:10:230
120529911522,15cyclictest31874-21/usr/sbin/munin08:25:250
120529911427,15cyclictest29773-21runrttasks08:17:250
120529911425,16cyclictest12651-21runrttasks11:22:220
120529911425,15cyclictest21080-21/usr/sbin/munin09:50:140
120529911422,15cyclictest5902-21/usr/sbin/munin08:50:250
120529911411,18cyclictest4513-21ntp_states08:45:230
2520821130,4chrt25211-21open_files10:05:250
120529911326,16cyclictest24657-21latency_hist12:10:020
120529911326,15cyclictest13435-21/usr/sbin/munin11:25:250
120529911324,13cyclictest27831-21load08:10:180
12052991127,14cyclictest28664-21sendmail-msp10:20:010
120529911227,13cyclictest7719-21sshd08:58:110
120529911226,15cyclictest7878-21latency_hist11:05:020
120529911210,19cyclictest22195-21df_inode12:00:140
120529911128,14cyclictest27126-21runrttasks12:19:510
120529911123,14cyclictest12821-21runrttasks07:11:010
120529911121,15cyclictest27591-21ntpq12:20:210
120529911119,17cyclictest16381-21runrttasks11:36:230
120529911112,22cyclictest9584-21memory09:05:190
120529911110,18cyclictest17262-21ntp_states11:40:220
120529911026,15cyclictest24443-21runrttasks07:56:080
120529911026,14cyclictest30793-21runrttasks10:26:300
120529911022,15cyclictest20258-21/usr/sbin/munin07:40:250
120529911020,16cyclictest3393-21runrttasks10:45:400
120529911012,19cyclictest24010-21find10:00:260
120529911011,17cyclictest5381-21df10:55:110
120529910923,13cyclictest18497-21sort07:35:010
120529910922,14cyclictest20545-21runrttasks09:47:110
120529910922,13cyclictest285-21sshd09:02:110
120529910921,14cyclictest20398-21runrttasks11:52:340
120529910919,14cyclictest22477-21sshd07:50:120
120529910826,12cyclictest5202-21cron10:55:010
120529910820,12cyclictest13978-21ls07:15:290
120529910811,16cyclictest8187-21/usr/sbin/munin11:05:190
120529910810,18cyclictest29370-21users10:20:270
12052991079,18cyclictest2806-21systemctl08:40:010
120529910711,18cyclictest17287-21irqstats09:35:180
120529910711,18cyclictest13884-21users09:20:310
120529910633,62cyclictest19256-21runrttasks07:35:530
120529910612,17cyclictest9281-21df_inode11:10:160
120529910611,19cyclictest1400-21sshd08:34:110
12052991059,17cyclictest16039-21/usr/sbin/munin07:25:310
12052991059,16cyclictest29638-21sshd12:29:100
120529910510,16cyclictest22003-21sshd07:47:110
12052991049,16cyclictest22354-21df09:55:120
120529910412,17cyclictest31154-21/usr/sbin/munin12:35:230
1131727019,30sleep011395-21cat07:05:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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