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2026-09-13 - 11:08

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 highest latencies:
System rack4slot6s.osadl.org (updated Sun Sep 13, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2923422490,2sleep029235-21egrep19:35:090
2916222330,3sleep029161-21tr23:45:200
2001921900,3sleep020017-21grep23:10:200
1050621520,3sleep010508-21readlink00:40:000
1904221240,3sleep019043-21awk23:05:270
979121180,3chrt9789-21ls20:25:160
2782021140,3chrt27821-21cpu21:35:130
1750421070,3sleep017545-21if_eth020:55:160
949921030,3sleep09497-21latency_hist22:30:020
2021321020,4sleep020215-21memory21:05:190
58821000,4sleep0586-21ntp_states00:00:230
108722880,3sleep010909-21if_err_eth022:35:160
33812860,3sleep03412-21latency20:00:150
31362860,4sleep03166-21cat00:10:250
161552864,8sleep016157-21memory22:55:230
278162763,63sleep027851-21sed19:30:010
2263227521,31sleep022659-21munin-run19:10:000
279572640,2sleep027954-21grep23:40:230
22679996429,26cyclictest30533-21/usr/sbin/munin23:50:270
22679996331,24cyclictest32103-21/usr/sbin/munin19:45:220
22679996331,22cyclictest17823-21/usr/sbin/munin23:00:280
2267999617,15cyclictest22535-21basename23:20:130
22679996137,15cyclictest22870-21/usr/sbin/munin19:10:170
22679996110,19cyclictest1780-21/usr/sbin/munin22:00:160
2267999599,16cyclictest21128-21munin-node23:15:120
2267999598,17cyclictest22688-21fw_packets21:15:160
2267999598,16cyclictest5634-21/usr/sbin/munin22:15:200
2267999598,15cyclictest6761-21/usr/sbin/munin00:25:290
22679995934,15cyclictest13703-21/usr/sbin/munin20:40:130
22679995933,16cyclictest30557-21/usr/sbin/munin21:45:190
22679995931,18cyclictest28659-21runrttasks19:31:210
22679995910,18cyclictest930-21ntp_states19:50:220
2267999589,19cyclictest7670-21sshd22:21:240
2267999589,19cyclictest29078-21/usr/sbin/munin21:40:290
2267999589,16cyclictest7101-21/usr/sbin/munin20:15:270
2267999589,15cyclictest16196-21df20:50:130
2267999588,18cyclictest26297-21/usr/sbin/munin23:35:290
2267999588,16cyclictest190372chrt21:00:250
2267999588,16cyclictest13452-21/usr/sbin/munin22:45:150
2267999587,17cyclictest8422-21/usr/sbin/munin20:20:210
2267999587,17cyclictest14689-21/usr/sbin/munin22:50:360
22679995815,15cyclictest12387-21ntpq22:40:210
22679995810,16cyclictest12553-21ntp_states20:35:220
323852573,8sleep00-21swapper21:51:360
2267999579,16cyclictest1985-21df19:55:140
2267999579,14cyclictest14862-21/usr/sbin/munin20:45:170
2267999578,17cyclictest6333-21grep20:10:280
2267999578,17cyclictest23730-21/usr/sbin/munin23:25:260
2267999578,16cyclictest9524-21egrep22:30:110
2267999577,17cyclictest10985-21/usr/sbin/munin20:30:160
22679995734,15cyclictest31445-21runrttasks23:55:060
22679995732,16cyclictest26680-21/usr/sbin/munin21:30:210
22679995731,16cyclictest4607-21/usr/sbin/munin00:15:300
2267999569,14cyclictest21372-21df21:10:130
2267999568,16cyclictest1596-21/usr/sbin/munin00:05:210
22679995635,15cyclictest25871-21/usr/sbin/munin19:20:300
22679995632,16cyclictest8235-21/usr/sbin/munin00:30:220
22679995632,16cyclictest4708-21/usr/sbin/munin22:10:250
22679995632,15cyclictest5609-21/usr/sbin/munin00:20:160
22679995610,19cyclictest24129-21df_inode19:15:150
22679995610,16cyclictest24070-21irqstats21:20:180
22679995610,14cyclictest4600-21/usr/sbin/munin20:05:140
2267999558,14cyclictest745-21ntp_states21:55:220
22679995534,15cyclictest31240-21runrttasks19:41:140
22679995533,14cyclictest3126-21/usr/sbin/munin22:05:120
22679995531,16cyclictest26302-21runrttasks21:29:340
22679995531,16cyclictest25206-21/usr/sbin/munin23:30:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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