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2026-08-09 - 20:22

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 Sun Aug 09, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1981823110,3sleep019816-21swap09:10:270
2116522490,3sleep021163-21grep07:10:260
2747221400,3sleep027470-21ls11:45:260
2767821310,3chrt27672-21mailstats07:35:250
1662921190,5chrt16624-21systemctl09:00:000
1044521160,3chrt10444-21tr10:40:200
1048521150,4sleep010293-21/usr/sbin/munin08:35:210
1711421100,3chrt17115-21swap11:05:260
146521010,3sleep0956-21/usr/sbin/munin12:10:280
67192920,3sleep06723-21vmstat12:30:300
180572890,3sleep018107-21sh09:05:120
154702890,2sleep015471-21cat11:00:150
2066227419,31sleep020687-21munin-run07:10:020
20713997037,21cyclictest7871-21irqstats08:25:170
20713996522,32cyclictest3973-21/usr/sbin/munin10:15:210
20713996439,15cyclictest276-21runrttasks10:10:250
20713996335,18cyclictest6438-21/usr/sbin/munin10:25:150
20713996335,17cyclictest6728-21ntp_states08:20:210
20713996234,16cyclictest6279-21ls10:25:010
20713996132,17cyclictest8874-21seq10:35:090
316602603,8sleep00-21swapper09:55:530
2071399609,17cyclictest7693-21ntp_states12:35:220
2071399607,18cyclictest11473-21/usr/sbin/munin10:45:150
20713996035,16cyclictest23318-21/usr/sbin/munin11:30:200
20713996035,16cyclictest14369-21/usr/sbin/munin10:55:250
20713996033,19cyclictest24569-21/usr/sbin/munin11:35:200
20713996033,16cyclictest5995-21seq08:17:370
20713996033,15cyclictest29778-21netstat11:55:180
20713996029,19cyclictest26048-21/usr/sbin/munin07:30:160
20713995931,18cyclictest10110-21sshd08:34:370
20713995925,22cyclictest7596-21/usr/sbin/munin10:30:210
20713995912,17cyclictest17098-21/usr/sbin/munin09:00:260
20713995911,16cyclictest4135-21ntp_states08:10:240
20713995911,15cyclictest29679-21/usr/sbin/munin09:50:150
2071399589,17cyclictest11605-21/usr/sbin/munin08:40:270
2071399589,15cyclictest1459-21memory08:00:200
2071399588,17cyclictest23413-21/usr/sbin/munin07:20:150
2071399588,15cyclictest26015-21grep09:35:190
2071399588,15cyclictest14464-21ntp_states08:50:240
2071399587,18cyclictest32593-21ntpq10:00:220
20713995834,15cyclictest4544-21runrttasks12:23:370
20713995834,15cyclictest24959-21/usr/sbin/munin07:25:190
20713995832,15cyclictest32183-21/usr/sbin/munin12:05:120
20713995810,18cyclictest24874-21wc09:30:270
20713995810,15cyclictest20629-21/usr/sbin/munin09:15:170
242732573,9sleep00-21swapper09:29:060
2071399579,17cyclictest17924-21/usr/sbin/munin11:10:220
2071399579,15cyclictest19489-21ntp_states11:15:210
2071399579,14cyclictest28473-21ls11:50:200
2071399578,17cyclictest2560-21/usr/sbin/munin08:05:290
20713995733,15cyclictest32014-21runrttasks07:52:460
20713995733,15cyclictest29505-21runrttasks07:43:140
20713995729,16cyclictest27247-21/usr/sbin/munin09:40:190
20713995710,14cyclictest5130-21ntp_states12:25:230
2071399569,17cyclictest21812-21/usr/sbin/munin11:25:290
2071399569,15cyclictest32420-21/usr/sbin/munin07:55:140
2071399567,16cyclictest29854-21/usr/sbin/munin07:45:270
20713995631,17cyclictest13078-21/usr/sbin/munin08:45:200
20713995629,20cyclictest21670-21runrttasks11:24:590
20713995627,19cyclictest12840-21/usr/sbin/munin10:50:150
20713995625,18cyclictest22154-21df_inode07:15:150
20713995612,17cyclictest257362chrt11:40:110
20713995611,15cyclictest2855-21sshd12:15:330
20713995610,17cyclictest31162-21awk12:00:250
2071399559,14cyclictest1210-21df_inode10:05:150
20713995532,16cyclictest29360-21runrttasks09:48:290
2071399548,15cyclictest21956-21/usr/sbin/munin09:20:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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