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2026-07-27 - 00:29

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Sun Jul 26, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
428522580,2sleep04284-21sort09:00:270
1468122550,3sleep014678-21ps07:35:250
1938122470,3sleep019380-21sed07:55:010
1916721770,3sleep019168-21modprobe10:00:000
667221340,4chrt6190-21/usr/sbin/munin11:15:280
1407121290,4chrt14000-21/usr/sbin/munin11:45:130
2346921200,3chrt23467-21interrupts08:10:160
2765721190,4chrt27656-21/usr/sbin/munin08:25:260
1536221150,4chrt15363-21latency_hist09:45:020
2230321050,4sleep022351-21/usr/sbin/munin10:10:260
2868021020,3sleep028738-21mailstats10:35:270
1542921010,4sleep015464-21/usr/sbin/munin11:50:190
247332980,4sleep024797-21mailstats12:25:270
323992960,2sleep032397-21grep10:50:180
257572950,4sleep025792-21load12:30:160
112672940,3sleep011280-21idleruntime-cro11:35:000
105062880,3sleep010542-21if_err_eth007:20:160
28462870,3sleep02924-21mailstats08:55:300
7735998049,20cyclictest13549-21sshd07:30:250
7735997748,16cyclictest12859-21irqstats11:40:180
712527718,34sleep07138-21vmstat07:05:270
7735997442,17cyclictest9127-21/usr/sbin/munin11:25:260
7735997345,18cyclictest20925-21/usr/sbin/munin12:10:270
7735997345,16cyclictest11748-21sshd11:35:250
182812730,2sleep018284-21wc12:00:270
7735997244,14cyclictest7898-21df_inode07:10:140
7735997238,21cyclictest22024-21ntp_states12:15:260
7735997143,19cyclictest20038-21/usr/sbin/munin07:55:300
7735997139,17cyclictest15988-21/usr/sbin/munin07:40:250
60722700,2sleep06073-21modprobe11:15:000
7735996946,14cyclictest12274-21/usr/sbin/munin07:25:290
7735996943,15cyclictest24160-21seq12:24:410
7735996942,17cyclictest276-21runrttasks10:19:090
7735996942,16cyclictest29915-21ntp_offset10:40:210
7735996942,16cyclictest1024-21/usr/sbin/munin10:55:220
7735996942,15cyclictest2556-21/usr/sbin/munin11:00:190
7735996940,15cyclictest19227-21df_inode12:05:140
7735996939,17cyclictest19631-21/usr/sbin/munin10:00:260
7735996928,24cyclictest31090-21/usr/sbin/munin08:40:310
7735996845,14cyclictest24664-21/usr/sbin/munin10:20:180
7735996843,16cyclictest29453-21sshd08:33:250
7735996842,15cyclictest29951-21grep08:35:170
7735996841,15cyclictest7796-21ntp_states11:20:220
7735996837,22cyclictest9106-21seq09:20:140
7735996744,14cyclictest25205-21/usr/sbin/munin08:15:280
7735996744,14cyclictest17243-21seq11:56:060
7735996744,14cyclictest16524-21runrttasks09:49:360
7735996741,16cyclictest16876-21/usr/sbin/munin07:45:300
7735996737,17cyclictest26471-21wc08:20:270
7735996645,13cyclictest21844-21chrt08:04:260
7735996644,13cyclictest1-21systemd09:15:010
7735996541,14cyclictest7719-21df_inode09:15:140
7735996541,13cyclictest9521-21grep07:15:250
7735996540,15cyclictest16894-21memory09:50:180
7735996539,17cyclictest27312-21grep10:30:210
7735996533,21cyclictest25823-21/usr/sbin/munin10:25:180
7735996531,20cyclictest916-21sshd08:48:510
7735996442,12cyclictest13964-21seq09:39:540
7735996440,15cyclictest4057-21mailstats11:05:260
7735996439,13cyclictest1488-21ntpq08:50:220
7735996438,14cyclictest11680-21/usr/sbin/munin09:30:180
7735996437,16cyclictest23208-21munin-plugin-st08:10:010
7735996427,22cyclictest30913-21/usr/sbin/munin10:45:230
7735996336,15cyclictest21750-21latency_hist10:10:010
7735996329,22cyclictest10269-21/usr/sbin/munin09:25:130
7735996241,13cyclictest5875-21runrttasks09:07:030
7735996237,14cyclictest27443-21ls12:35:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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