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2026-07-20 - 01:14

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 50 highest latencies:
System rack4slot6s.osadl.org (updated Sun Jul 19, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1621922520,2sleep016217-21awk11:05:210
2011422040,2sleep020113-21sort07:10:020
2377921880,2sleep023776-21grep09:30:010
3260321300,4chrt32604-21latency_hist12:10:000
3038521150,3chrt30386-21latency_hist07:50:010
2163821120,5sleep021446-21/usr/sbin/munin07:15:210
1886621020,4sleep018863-21cat09:10:160
2144921000,3sleep021301-21/usr/sbin/munin09:20:180
88082990,4sleep08875-21threads08:30:280
228292990,3sleep022846-21/usr/sbin/munin07:20:150
121272980,4sleep012165-21/usr/sbin/munin10:50:140
112172970,2sleep011273-21switchtime10:45:280
27282940,3sleep02729-21basename12:20:000
213302905,10sleep021395-21cat07:15:010
252522865,10sleep025273-21ntp_states11:40:210
265922850,3sleep026666-21uname11:45:260
43342723,57sleep020057-21cyclictest10:20:100
20060996927,16cyclictest5763-21irqstats10:25:180
20060996430,23cyclictest2428-21/usr/sbin/munin08:05:280
20060996130,19cyclictest31318-21latency_hist12:05:010
2006099609,17cyclictest21118-21/usr/sbin/munin11:25:280
2006099608,18cyclictest14943-21ntp_states11:00:210
20060996036,16cyclictest7331-21/usr/sbin/munin08:25:200
20060996035,15cyclictest25472-21/usr/sbin/munin07:30:170
20060996034,16cyclictest7095-21/usr/sbin/munin10:30:190
20060996010,16cyclictest16112-21/usr/sbin/munin09:00:300
2006099598,19cyclictest27924-21/usr/sbin/munin07:40:290
20060995935,14cyclictest11146-21/usr/sbin/munin08:40:180
20060995934,15cyclictest27207-21/usr/sbin/munin07:35:300
20060995931,16cyclictest3338-21/usr/sbin/munin10:15:230
20060995910,16cyclictest27906-21cat09:45:180
20060995910,16cyclictest23868-21/usr/sbin/munin09:30:250
20060995910,13cyclictest25153-21/usr/sbin/munin09:35:290
2006099589,19cyclictest24269-21users11:35:260
20060995835,15cyclictest20149-21/usr/sbin/munin09:15:190
20060995833,16cyclictest4553-21/usr/sbin/munin08:15:120
20060995816,13cyclictest12505-21awk08:45:210
2006099579,15cyclictest20921-21sshd11:24:310
2006099578,18cyclictest4151-21/usr/sbin/munin12:25:210
2006099578,15cyclictest31620-21/usr/sbin/munin10:00:160
2006099578,14cyclictest10117-21seq10:40:350
20060995734,15cyclictest18114-21runrttasks11:12:500
20060995734,15cyclictest13774-21/usr/sbin/munin08:50:180
20060995733,15cyclictest17546-21/usr/sbin/munin09:05:160
20060995731,16cyclictest1873-21/usr/sbin/munin10:10:160
20060995730,15cyclictest27723-21/usr/sbin/munin11:50:190
20060995711,14cyclictest13894-21/usr/sbin/munin10:55:290
2006099569,16cyclictest442-21/usr/sbin/munin10:05:140
2006099569,14cyclictest6901-21memory12:35:180
2006099568,15cyclictest24105-21df_inode07:25:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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