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2026-08-02 - 02:09

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 Aug 02, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2773922650,2sleep027737-21ntpq20:40:220
704422570,3sleep07042-21ps21:25:250
2445522450,3sleep024452-21grep00:40:020
3105213519,90sleep03113-21memory19:05:160
41229912036,73cyclictest28679-21/usr/sbin/munin22:50:150
1316821200,4chrt13166-21sed19:45:000
4122991169,92cyclictest25180-21ntp_states20:30:260
41229911510,78cyclictest20055-21sshd00:21:010
4122991148,90cyclictest1345-21df_inode23:10:140
4122991136,16cyclictest17380-21wc22:05:250
41229911332,70cyclictest22614-21/usr/sbin/munin20:20:230
41229911311,90cyclictest18499-21df_inode20:05:130
41229911310,89cyclictest27463-21/usr/sbin/munin22:45:180
422321120,5sleep04224-21/usr/sbin/munin19:10:100
41229911210,88cyclictest20854-21memory00:25:180
41229911210,87cyclictest8404-21/usr/sbin/munin19:25:220
4122991109,87cyclictest22200-21runrttasks22:25:140
41229911034,67cyclictest16427-21/usr/sbin/munin19:55:290
41229911027,71cyclictest11945-21/usr/sbin/munin23:50:240
4122991099,87cyclictest29399-21chrt20:45:450
4122991099,86cyclictest26286-21if_eth020:35:130
4122991098,88cyclictest13342-21/usr/sbin/munin19:45:140
4122991097,87cyclictest14885-21/usr/sbin/munin19:50:250
4122991096,90cyclictest2058-21users21:05:300
4122991096,88cyclictest9495-21ntp_offset21:35:220
41229910910,70cyclictest4343-21ntp_states21:15:250
4122991089,85cyclictest9518-21if_eth019:30:130
4122991088,86cyclictest4192-21ntp_states23:20:260
4122991088,86cyclictest15912-21grep00:05:300
4122991088,85cyclictest20788-21ls22:20:010
4122991087,88cyclictest23676-21/usr/sbin/munin20:25:130
4122991087,87cyclictest6101-21users19:15:300
41229910834,64cyclictest18332-21/usr/sbin/munin00:15:210
41229910829,69cyclictest13720-21runrttasks21:50:430
41229910829,67cyclictest17961-21runrttasks20:02:100
41229910812,85cyclictest3455-21sshd23:17:450
4122991079,86cyclictest31236-21df_inode23:00:140
4122991079,86cyclictest15967-21ntp_states22:00:220
4122991079,84cyclictest20971-21latency_hist20:15:020
4122991078,87cyclictest8562-21runrttasks21:30:410
4122991077,86cyclictest22024-21runrttasks20:18:530
4122991076,11cyclictest7798-21df23:35:130
4122991075,12cyclictest10999-21/usr/sbin/munin21:40:260
41229910727,69cyclictest114-21systemd-journal19:24:590
4122991069,84cyclictest24850-21irqstats22:35:180
4122991068,85cyclictest16977-21cat00:10:170
4122991067,87cyclictest26202-21memory22:40:170
4122991066,88cyclictest10739-21df_inode19:35:140
4122991066,87cyclictest10265-21sort23:45:020
4122991066,13cyclictest24212-21chrt22:32:010
4122991066,11cyclictest22075-21sed22:25:020
4122991066,10cyclictest12398-21users21:45:290
4122991065,10cyclictest6739-21/usr/sbin/munin23:30:220
4122991057,86cyclictest453-21ntp_states21:00:210
4122991057,86cyclictest12956-21df23:55:140
41229910526,67cyclictest3062-21/usr/sbin/munin21:10:240
41229910522,72cyclictest5226-21runrttasks23:25:100
4122991049,82cyclictest30044-21/usr/sbin/munin20:50:150
4122991049,80cyclictest14210-21/usr/sbin/munin00:00:160
4122991048,83cyclictest5368-21/usr/sbin/munin21:20:170
4122991047,84cyclictest31392-21/usr/sbin/munin20:55:140
4122991046,12cyclictest30293-21mailstats22:55:260
4122991045,12cyclictest276-21runrttasks00:31:260
4122991045,11cyclictest11548-21latency_hist23:50:020
41229910418,74cyclictest32539-21seq23:05:150
4122991036,10cyclictest15544-21munin-run22:00:010
4122991035,11cyclictest18317-21df_inode22:10:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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