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2026-03-15 - 20:42

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Sun Mar 15, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1983022450,3sleep019829-21wc12:10:270
3135422140,2sleep031353-21sort08:45:120
1569221370,2sleep015693-21latency_hist07:45:030
1660921190,4chrt16611-21tr12:00:010
3016721160,2sleep030166-21processes10:45:240
1167621140,3sleep011714-21irqstats11:40:160
143721120,3sleep01375-21/usr/sbin/munin08:55:150
1846321050,4chrt18464-21sendmail_mailtr12:05:240
1434221030,3sleep014341-21latency_hist07:40:020
30132980,4sleep03082-21/usr/sbin/munin11:05:260
4372960,3sleep0436-21cat10:55:280
115202896,13sleep011521-21sshd07:28:220
107432890,4sleep010788-21ps09:30:230
101272890,3sleep010154-21latency_hist11:35:010
71132855,68sleep07180-21switchtime07:10:290
275022816,11sleep027531-21irqstats08:30:150
653427419,33sleep06557-21ls07:10:000
6585997031,14cyclictest27215-21runrttasks10:35:090
225942686,13sleep00-21swapper12:21:110
6585996429,27cyclictest20676-21/usr/sbin/munin12:15:150
6585996310,18cyclictest20829-21df_inode10:10:130
658599629,18cyclictest16779-21df12:00:110
658599608,18cyclictest12146-21ntp_states07:30:240
6585996035,15cyclictest1374-21/usr/sbin/munin11:00:160
6585996034,17cyclictest14583-21/usr/sbin/munin09:45:200
658599599,17cyclictest5268-21/usr/sbin/munin09:10:250
658599598,21cyclictest2954-21ntpq09:00:200
658599598,18cyclictest31095-21/usr/sbin/munin10:50:300
6585995935,15cyclictest11369-21runrttasks11:39:400
6585995924,25cyclictest6854-21sshd09:15:230
6585995911,16cyclictest12016-21ntp_states09:35:220
6585995910,22cyclictest288-21snmpd08:28:450
658599589,16cyclictest24826-21/usr/sbin/munin08:20:140
658599589,15cyclictest5372-21ntp_states11:15:210
658599588,18cyclictest32553-21/usr/sbin/munin08:50:260
658599588,18cyclictest15599-21/usr/sbin/munin09:50:150
658599588,17cyclictest28531-21/usr/sbin/munin10:40:200
6585995810,17cyclictest18060-21munin-run10:00:010
244592583,5sleep00-21swapper12:30:050
658599579,15cyclictest7969-21/usr/sbin/munin07:15:270
658599579,13cyclictest9285-21/usr/sbin/munin07:20:190
658599578,18cyclictest3805-21/usr/sbin/munin11:10:260
658599578,17cyclictest19485-21/usr/sbin/munin10:05:290
658599577,18cyclictest13036-21/usr/sbin/munin09:40:160
6585995734,15cyclictest17386-21/usr/sbin/munin07:50:230
6585995732,16cyclictest16579-21runrttasks07:47:080
6585995731,18cyclictest26531-21runrttasks10:30:290
6585995731,17cyclictest22352-21ntp_states10:15:230
6585995730,17cyclictest9462-21runrttasks09:25:230
658599569,15cyclictest18194-21/usr/sbin/munin10:00:280
658599568,18cyclictest23338-21irqstats12:25:190
658599568,16cyclictest3978-21/usr/sbin/munin09:05:220
658599568,15cyclictest28673-21/usr/sbin/munin08:35:090
658599567,16cyclictest23371-21/usr/sbin/munin10:20:170
6585995632,16cyclictest8803-21runrttasks09:23:090
6585995632,15cyclictest19799-21/usr/sbin/munin08:00:170
6585995631,16cyclictest7881-21/usr/sbin/munin11:25:180
6585995629,17cyclictest30597-21runrttasks08:40:300
6585995611,15cyclictest13943-21seq11:49:310
6585995610,15cyclictest26926-21munin-run12:40:010
658599558,14cyclictest14277-21irqstats11:50:150
658599556,22cyclictest24655-21/usr/sbin/munin10:25:140
6585995531,16cyclictest22471-21/usr/sbin/munin08:10:200
658599549,18cyclictest21226-21ntp_states08:05:220
658599549,15cyclictest6700-21ntp_states11:20:210
658599549,15cyclictest23827-21chrt08:15:260
6585995427,16cyclictest87-21jbd2/mmcblk0p1-07:55:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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