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2026-08-25 - 07:34

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 Tue Aug 25, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
499822590,2sleep04995-21cat22:55:290
2524322510,2sleep025242-21wc00:21:330
3072821370,3sleep030727-21tr22:30:200
1893421360,3chrt18861-21/usr/sbin/munin21:45:170
3042721240,3chrt30428-21latency_hist22:30:010
1616121150,3sleep016162-21df23:40:140
1393821130,4sleep013879-21/usr/sbin/munin19:20:140
2858121020,4sleep028601-21df00:35:110
224421010,2sleep02247-21latency20:40:170
253582970,3sleep025364-21df_inode22:10:110
214632910,3sleep021493-21latency_hist19:50:000
49892880,3sleep05062-21mailstats20:50:270
109952885,9sleep011001-21df_inode23:20:130
22142878,65sleep02282-21ps22:45:250
138942870,3sleep013897-21sort21:25:160
321912860,3sleep032189-21grep20:30:210
85792850,3sleep08607-21basename21:05:140
240432836,65sleep024056-21munin-run20:00:010
148072830,4sleep014855-21grep23:35:230
45672820,2sleep04568-21latency_hist20:50:010
1019627820,32sleep010232-21ntpq19:05:180
11176996432,21cyclictest26768-21/usr/sbin/munin20:10:110
11176996324,15cyclictest3744-21runrttasks22:50:280
11176996322,15cyclictest19323-21ntp_states19:40:240
1117699627,21cyclictest12418-21/usr/sbin/munin21:20:270
11176996035,16cyclictest20164-21/usr/sbin/munin00:00:110
11176996011,17cyclictest27351-21/usr/sbin/munin00:30:160
1117699599,16cyclictest31754-21/usr/sbin/munin22:35:260
1117699599,15cyclictest31219-21/usr/sbin/munin20:25:300
1117699598,15cyclictest5766-21/usr/sbin/munin23:00:280
11176995934,16cyclictest12816-21/usr/sbin/munin19:15:200
11176995910,16cyclictest22939-21awk00:10:220
1117699589,18cyclictest26588-21/usr/sbin/munin22:15:300
1117699589,17cyclictest20652-21awk21:50:260
1117699589,16cyclictest21994-21users00:05:310
1117699588,15cyclictest21421-21/usr/sbin/munin21:55:290
11176995835,13cyclictest18137-21/usr/sbin/munin19:35:260
11176995834,16cyclictest24782-21/usr/sbin/munin20:00:280
11176995833,15cyclictest1044-21/usr/sbin/munin22:40:270
11176995821,12cyclictest11455-21latency19:10:170
11176995819,14cyclictest224892chrt19:52:500
1117699579,18cyclictest11396-21ntp_states21:15:260
1117699579,16cyclictest307-21munin-node22:20:110
1117699579,15cyclictest13508-21/usr/sbin/munin23:30:130
1117699579,15cyclictest12224-21/usr/sbin/munin23:25:200
1117699578,15cyclictest17576-21/usr/sbin/munin21:40:260
11176995734,15cyclictest16314-21/usr/sbin/munin21:35:110
11176995734,15cyclictest1528-21runrttasks20:36:520
11176995732,15cyclictest24188-21/usr/sbin/munin22:05:190
11176995713,16cyclictest282422chrt20:15:190
1117699568,16cyclictest18788-21/usr/sbin/munin23:55:110
1117699567,18cyclictest15160-21/usr/sbin/munin19:25:290
11176995633,15cyclictest25897-21/usr/sbin/munin20:05:270
11176995632,16cyclictest7243-21/usr/sbin/munin23:05:180
11176995632,15cyclictest15314-21/usr/sbin/munin21:30:260
11176995614,13cyclictest288-21snmpd21:01:100
11176995611,15cyclictest10093-21ntp_states21:10:230
11176995610,14cyclictest8388-21df23:10:120
1117699559,18cyclictest22784-21df22:00:130
1117699558,18cyclictest29642-21ntpq20:20:200
11176995532,16cyclictest6053-21/usr/sbin/munin20:55:150
11176995528,17cyclictest18219-21runrttasks23:51:180
11176995510,15cyclictest288-21snmpd00:26:050
1117699547,16cyclictest16491-21df19:30:110
11176995432,14cyclictest9767-21sendmail-mta23:15:170
11176995329,15cyclictest17874-21runrttasks23:49:220
11176995210,15cyclictest24609-21latency_hist00:20:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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