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2026-07-18 - 03:21

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 highest latencies:
System rack4slot6s.osadl.org (updated Sat Jul 18, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2920422490,3sleep029201-21grep23:10:020
2273221380,2sleep022734-21idleruntime-cro22:45:000
503521290,4chrt5033-21ntp_kernel_pll_21:35:200
1749821270,3sleep017499-21date00:30:010
512621250,3chrt5109-21latency19:30:170
3118021180,4chrt31178-21users23:15:270
2168521180,3chrt21686-21latency_hist20:35:020
3229921160,3chrt32270-21processes23:20:240
1537621130,3sleep015410-21irqstats20:10:140
637621120,4sleep06415-21memory19:35:170
894521017,12sleep08964-21/usr/sbin/munin21:50:250
48722970,3sleep04899-21ntp_states23:40:210
77422950,4sleep07801-21ntpq19:40:190
21652926,10sleep02198-21sed23:30:180
33582916,11sleep03364-21df_inode23:35:130
300482835,9sleep030073-21users21:05:290
89282786,60sleep08988-21cat23:55:260
3210627724,29sleep032115-21/usr/sbin/munin19:10:010
98362756,57sleep09839-21df_inode00:00:140
35922750,3sleep03595-21latency_hist19:25:020
13072640,2sleep01310-21wc23:25:280
32138996311,20cyclictest3780-21ntp_states21:30:230
125392630,2sleep012542-21cpu22:05:090
3213899629,19cyclictest15372-21ntpq22:15:200
32138996128,22cyclictest1547-21/usr/sbin/munin19:15:290
32138996110,16cyclictest28379-21memory21:00:180
32138996035,15cyclictest19240-21/usr/sbin/munin20:25:150
32138996021,14cyclictest21877-21latency20:35:170
3213899598,17cyclictest13988-21/usr/sbin/munin20:05:290
3213899598,16cyclictest17873-21/usr/sbin/munin20:20:110
3213899598,15cyclictest19168-21memory22:30:170
3213899597,20cyclictest26878-21seq23:00:150
3213899588,18cyclictest12348-21/usr/sbin/munin00:10:170
3213899588,17cyclictest917-21/usr/sbin/munin21:20:140
3213899587,18cyclictest25603-21/usr/sbin/munin20:50:220
32138995834,15cyclictest31371-21users21:10:300
32138995833,16cyclictest19923-21runrttasks00:39:470
101012583,9sleep00-21swapper19:50:090
32138995732,17cyclictest13940-21latency_hist20:05:020
32138995730,16cyclictest29909-21/usr/sbin/munin23:10:300
32138995728,17cyclictest24023-21munin-run22:50:020
32138995710,16cyclictest32391-21/usr/sbin/munin21:15:240
3213899568,16cyclictest9356-21/usr/sbin/munin19:45:270
3213899568,15cyclictest6082-21munin-node21:40:110
3213899568,15cyclictest16231-21/usr/sbin/munin00:25:290
3213899567,16cyclictest17699-21/usr/sbin/munin22:25:260
3213899567,14cyclictest5894-21/usr/sbin/munin23:45:110
32138995633,14cyclictest27323-21/usr/sbin/munin20:55:270
32138995633,14cyclictest25570-21/usr/sbin/munin22:55:180
32138995633,14cyclictest20548-21/usr/sbin/munin22:35:190
32138995631,16cyclictest24321-21/usr/sbin/munin22:50:160
32138995631,16cyclictest10881-21runrttasks21:58:210
32138995631,15cyclictest2684-21/usr/sbin/munin21:25:280
32138995630,16cyclictest14317-21runrttasks00:16:100
32138995629,16cyclictest7687-21/usr/sbin/munin21:45:240
32138995610,15cyclictest11069-21egrep00:05:110
32138995610,14cyclictest13815-21/usr/sbin/munin22:10:320
3213899559,16cyclictest23034-21/usr/sbin/munin20:40:270
3213899557,15cyclictest3661-21/usr/sbin/munin19:25:170
3213899557,14cyclictest15141-21memory00:20:180
32138995533,14cyclictest12386-21runrttasks22:04:550
32138995531,15cyclictest16640-21/usr/sbin/munin20:15:150
32138995531,15cyclictest12119-21runrttasks19:56:320
32138995530,17cyclictest25117-21runrttasks20:47:060
32138995529,16cyclictest8293-21runrttasks23:54:420
32138995510,16cyclictest17201-21sshd22:21:590
3213899549,19cyclictest32521-21ntp_states19:10:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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