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2026-01-12 - 01:50

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 Jan 11, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1981623060,3sleep019818-21timerandwakeup12:10:240
517422410,3sleep05175-21cat09:10:020
1800522110,3sleep018006-21run-parts10:00:010
2721521250,4chrt27170-21/usr/sbin/munin10:35:110
1082121190,4chrt10255-21/usr/sbin/munin11:35:280
3129321170,3chrt31291-21entropy08:45:140
1438921150,3chrt14386-21ntpq11:50:190
1200221140,4chrt12000-21open_inodes09:35:230
2759621110,2sleep027598-21tr08:30:190
2893421080,3chrt28930-21find10:40:250
249762970,4sleep025033-21/usr/sbin/munin08:20:180
270342920,3sleep027039-21modprobe10:34:590
134192914,9sleep013423-21ntp_states07:35:230
53822896,9sleep05408-21memory09:10:180
145372895,10sleep014556-21ntp_states09:45:210
133942885,9sleep013453-21swap09:40:260
65592865,9sleep06565-21df_inode09:15:130
212882790,3sleep021313-21users10:10:290
564327320,30sleep05661-21ntp_states07:05:220
6575996135,16cyclictest11929-21/usr/sbin/munin07:30:150
6575996129,22cyclictest8968-21runrttasks09:24:570
6575996124,25cyclictest19903-21/usr/sbin/munin08:00:250
6575996026,23cyclictest32440-21/usr/sbin/munin10:55:130
6575996020,15cyclictest10610-21cpu07:25:120
657599599,18cyclictest7804-21if_eth011:25:160
657599599,16cyclictest216-21rs:main0
6575995934,16cyclictest32573-21/usr/sbin/munin08:50:130
6575995934,15cyclictest31237-21/usr/sbin/munin10:50:170
6575995929,22cyclictest31052-21latency_hist10:50:020
6575995912,13cyclictest6691-21ntp_states11:20:210
186482590,2sleep018718-21timerwakeupswit10:00:270
657599589,16cyclictest17523-21sshd07:50:280
6575995833,16cyclictest25242-21runrttasks12:35:140
6575995833,16cyclictest22947-21/usr/sbin/munin12:25:250
6575995817,13cyclictest9297-21open_inodes11:30:230
6575995810,17cyclictest30123-21memory08:40:170
17252580,3sleep01726-21find08:55:260
657599579,17cyclictest9277-21/usr/sbin/munin07:20:100
657599578,18cyclictest12845-21/usr/sbin/munin11:45:180
657599578,16cyclictest21837-21chrt12:20:240
657599578,14cyclictest16917-21memory12:00:180
6575995733,16cyclictest15580-21/usr/sbin/munin11:55:180
6575995733,14cyclictest21021-21/usr/sbin/munin08:05:150
6575995732,16cyclictest7270-21/usr/sbin/munin07:10:300
6575995730,16cyclictest19464-21awk08:00:000
6575995729,17cyclictest14581-21/usr/sbin/munin07:40:160
6575995711,18cyclictest5349-21ntp_kernel_pll_11:15:200
657599569,14cyclictest20532-21sshd10:09:340
657599569,14cyclictest1284-21df_inode11:00:140
657599568,13cyclictest185072sleep012:05:270
657599567,14cyclictest2710-21seq11:05:180
6575995631,16cyclictest24321-21runrttasks10:23:440
6575995630,15cyclictest9233-21/usr/sbin/munin09:25:130
6575995629,16cyclictest28682-21df08:35:140
6575995611,16cyclictest24903-21ntp_states10:25:260
6575995611,15cyclictest21194-21munin-run12:20:010
6575995610,17cyclictest22458-21ntp_states08:10:220
6575995610,14cyclictest23459-21/usr/sbin/munin08:15:250
657599559,15cyclictest26063-21/usr/sbin/munin08:25:180
657599558,18cyclictest2749-21if_eth009:00:160
657599558,16cyclictest24176-21ntpq12:30:200
657599557,15cyclictest8917-21seq07:18:210
6575995512,15cyclictest288-21snmpd11:14:430
6575995510,17cyclictest11476-21sshd09:34:280
657599549,15cyclictest12356-21chrt11:42:000
657599546,14cyclictest16409-21seq09:52:350
657599538,16cyclictest23205-21sendmail-msp10:20:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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