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2026-08-03 - 01:42

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 Aug 02, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1583922620,2sleep015838-21cut11:55:270
2908322250,3sleep029082-21awk08:35:280
65939912934,15cyclictest17359-21/usr/sbin/munin09:55:290
906621250,3chrt9067-21latency_hist09:25:020
65939912532,15cyclictest24102-21runrttasks08:15:430
65939912431,16cyclictest13515-21runrttasks11:46:220
65939912430,15cyclictest20997-21/usr/sbin/munin08:05:190
5454212318,81sleep05460-21df_inode07:05:160
2907121220,3chrt28482-21/usr/sbin/munin10:40:280
1073021220,4chrt10732-21grep07:25:170
65939912131,15cyclictest6693-21/usr/sbin/munin11:20:240
65939911931,16cyclictest21495-21runrttasks12:18:000
65939911823,18cyclictest11731-21df09:35:120
6593991178,14cyclictest23388-21latency_hist08:15:020
6593991178,12cyclictest30357-21mailstats08:40:260
65939911728,14cyclictest26782-21runrttasks10:32:520
65939911723,15cyclictest32730-21/usr/sbin/munin10:55:260
65939911627,14cyclictest26276-21/usr/sbin/munin12:35:260
65939911530,13cyclictest16391-21runrttasks07:45:530
65939911527,15cyclictest12244-21runrttasks11:41:270
65939911525,16cyclictest7316-21runrttasks07:10:370
65939911430,15cyclictest15674-21latency_hist07:45:000
65939911429,14cyclictest32016-21runrttasks08:47:000
65939911412,18cyclictest29907-21irqstats10:45:160
6593991139,15cyclictest5335-21ntp_states11:15:230
6593991139,14cyclictest8709-21sshd07:16:330
65939911327,15cyclictest5815-21/usr/sbin/munin09:10:290
65939911327,14cyclictest16630-21runrttasks09:54:230
65939911326,14cyclictest12513-21runrttasks07:30:520
65939911326,13cyclictest276-21runrttasks08:55:250
65939911311,19cyclictest3064-21users11:05:290
65939911212,20cyclictest14142-21df11:50:150
65939911127,13cyclictest14099-21runrttasks07:38:250
65939911126,15cyclictest10563-21runrttasks11:35:260
65939911119,18cyclictest2833-21memory09:00:190
65939911111,19cyclictest31344-21ntp_states10:50:250
65939911110,20cyclictest24893-21ntp_states10:25:230
65939911110,19cyclictest18239-21ntpq12:05:200
65939911024,15cyclictest26298-21runrttasks08:25:210
65939911022,15cyclictest23877-21runrttasks12:26:140
65939911010,12cyclictest19586-21ntp_states12:10:230
6593991098,19cyclictest9664-21sshd11:31:340
65939910926,17cyclictest22701-21runrttasks10:16:140
65939910925,13cyclictest20730-21runrttasks08:04:410
65939910923,14cyclictest7233-21runrttasks09:16:260
65939910922,16cyclictest10073-21runrttasks09:28:250
65939910922,14cyclictest19265-21runrttasks10:04:400
65939910921,15cyclictest21849-21runrttasks10:14:500
65939910911,25cyclictest16807-21if_eth012:00:160
1875621090,4chrt18757-21mailstats07:55:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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