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2025-12-06 - 04:03

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 Sat Dec 06, 2025 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3275421420,4chrt32753-21/usr/sbin/munin23:50:270
1739421400,3chrt17395-21/usr/sbin/munin20:45:260
799421320,3chrt7997-21latency20:10:220
692221290,4chrt6921-21/usr/sbin/munin20:05:250
889821030,3sleep08897-21grep00:25:150
249092970,3sleep024928-21/usr/sbin/munin19:10:180
160602970,4sleep016131-21wc20:40:290
139882946,12sleep014007-21sendmail22:40:000
147302920,3sleep014733-21cut20:35:260
246782860,2sleep024681-21latency_hist19:10:010
39792836,64sleep03981-21ntp_states00:05:300
300392796,60sleep030068-21ntpq21:35:200
287162785,60sleep028772-21ntpq21:30:210
196092764,63sleep019612-21ntp_states23:00:220
153002740,3sleep015313-21ls22:45:000
62662710,3sleep06265-21ls22:10:010
24666996420,13cyclictest269-21runrttasks21:10:170
2466699609,16cyclictest2500-21/usr/sbin/munin21:55:200
2466699608,18cyclictest1355-21/usr/sbin/munin19:45:310
24666996024,27cyclictest5302-21ps00:10:250
24666996010,16cyclictest15726-21ntpq22:45:210
2466699599,17cyclictest29674-21/usr/sbin/munin23:40:160
24666995935,15cyclictest25017-21/usr/sbin/munin21:15:270
24666995934,16cyclictest10462-21/usr/sbin/munin20:20:120
24666995920,12cyclictest26161-21if_eth019:15:150
24666995911,16cyclictest10339-21memory00:30:220
24666995910,16cyclictest2884-21netstat19:50:190
2466699589,16cyclictest27827-21/usr/sbin/munin21:25:320
24666995834,16cyclictest9263-21/usr/sbin/munin22:20:230
24666995834,15cyclictest31171-21/usr/sbin/munin21:40:130
24666995834,15cyclictest28858-21/usr/sbin/munin23:35:280
24666995833,15cyclictest6721-21/usr/sbin/munin00:15:280
24666995833,15cyclictest23481-21/usr/sbin/munin23:15:240
24666995832,15cyclictest22594-21/usr/sbin/munin21:05:300
24666995830,17cyclictest10503-21/usr/sbin/munin22:25:230
24666995811,16cyclictest1129-21df_inode23:55:150
2466699579,15cyclictest20898-21ntp_states23:05:230
2466699579,15cyclictest19626-21memory20:55:200
2466699578,18cyclictest30526-21seq19:30:290
24666995736,13cyclictest13465-21/usr/sbin/munin20:30:300
24666995733,15cyclictest3979-21/usr/sbin/munin19:55:130
24666995733,14cyclictest675-21/usr/sbin/munin19:40:300
24666995719,27cyclictest269-21runrttasks21:00:120
24666995719,14cyclictest12003-21timerandwakeup00:35:290
24666995712,17cyclictest4403-21users22:00:290
24666995710,16cyclictest7734-21df_inode22:15:170
2466699569,18cyclictest27078-21/usr/sbin/munin23:30:280
2466699569,16cyclictest21897-21/usr/sbin/munin23:10:250
2466699569,15cyclictest11705-21/usr/sbin/munin20:25:140
2466699568,19cyclictest24708-21chrt23:20:210
2466699568,15cyclictest31218-21/usr/sbin/munin19:35:120
2466699568,14cyclictest16722-21chrt22:50:100
2466699567,16cyclictest28651-21/usr/sbin/munin19:25:100
24666995611,18cyclictest18216-21df_inode20:50:140
24666995610,18cyclictest9092-21seq20:15:100
24666995610,15cyclictest7557-21/usr/sbin/munin00:20:250
2466699559,15cyclictest11558-21/usr/sbin/munin22:30:160
2466699559,14cyclictest5295-21df_inode20:00:130
2466699558,15cyclictest27369-21/usr/sbin/munin19:20:160
2466699558,15cyclictest18013-21/usr/sbin/munin22:55:310
2466699557,16cyclictest30961-21/usr/sbin/munin23:45:250
24666995532,16cyclictest26009-21df_inode21:20:150
24666995532,15cyclictest1654-21/usr/sbin/munin21:50:270
24666995511,15cyclictest26085-21ntp_states23:25:250
2466699549,15cyclictest2671-21ntpq00:00:240
2466699547,16cyclictest6389-21/usr/sbin/munin22:10:290
24666995410,16cyclictest522-21users21:45:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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