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2025-12-19 - 21:59

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 Fri Dec 19, 2025 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2323222570,3sleep023230-21grep11:35:270
82321440,3chrt562-21/usr/sbin/munin12:15:190
100721300,2sleep01005-21forks08:05:140
242421130,3chrt2423-21/usr/sbin/munin08:10:190
996821120,4chrt9970-21latency10:45:170
322021070,4sleep03228-21df_inode12:25:110
578621020,3sleep05802-21munin-run10:30:000
470021010,3sleep04759-21latency_hist08:20:020
896321000,3sleep08965-21ntpq08:35:250
221722980,3sleep022220-21sendmail_mailtr07:20:250
124302980,4sleep012513-21cat08:50:020
115862970,3sleep011661-21sed10:50:280
205272916,10sleep020547-21idleruntime07:15:140
152582915,10sleep015263-21ntp_states11:05:220
191482865,67sleep019178-21cat09:15:160
168912850,3sleep016949-21timerandwakeup09:05:270
282152820,3sleep028279-21mailstats11:55:260
213082816,60sleep021376-21sed11:30:010
1838927619,33sleep018464-21users07:05:250
176902750,2chrt17688-21wc11:15:160
71752740,2sleep07173-21grep10:35:020
49902740,2sleep04989-21wc08:20:180
166672730,3sleep016669-21awk11:10:270
105012730,3sleep010499-21cat08:40:280
19078996628,29cyclictest15430-21/usr/sbin/munin09:00:220
19078996520,15cyclictest12546-21/usr/sbin/munin08:50:200
306382635,45sleep00-21swapper10:00:100
19078996132,18cyclictest5038-21/usr/sbin/munin12:30:280
19078996033,17cyclictest28810-21/usr/sbin/munin07:45:280
19078996029,23cyclictest26881-21latency_hist07:40:020
1907899599,16cyclictest23477-21users09:30:260
19078995934,16cyclictest7445-21/usr/sbin/munin08:30:130
19078995932,16cyclictest7391-21/usr/sbin/munin10:35:170
19078995926,22cyclictest23358-21/usr/sbin/munin07:25:220
19078995920,15cyclictest19517-21proc_pri07:10:240
19078995834,16cyclictest8599-21/usr/sbin/munin10:40:140
19078995833,15cyclictest17776-21/usr/sbin/munin09:10:130
19078995832,17cyclictest32373-21/usr/sbin/munin10:05:260
19078995811,15cyclictest19000-21/usr/sbin/munin11:20:170
1907899579,16cyclictest29363-21memory12:00:180
1907899578,18cyclictest27017-21ntp_kernel_err09:45:200
1907899578,16cyclictest28046-21/usr/sbin/munin09:50:100
1907899578,14cyclictest25492-21grep09:40:130
1907899576,15cyclictest21430-21/usr/sbin/munin11:30:310
19078995732,17cyclictest27088-21/usr/sbin/munin07:40:170
19078995732,16cyclictest24429-21/usr/sbin/munin07:30:130
19078995732,15cyclictest29926-21/usr/sbin/munin09:55:280
19078995731,16cyclictest12511-21irqstats10:55:160
19078995711,16cyclictest3407-21df10:20:120
19078995710,17cyclictest20732-21find09:20:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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