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2026-07-24 - 12:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #4

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of all highest latencies:
System rackfslot4s.osadl.org (updated Fri Jul 24, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
64021230,2chrt641-21/usr/sbin/munin22:37:230
151021230,1sleep01507-21df20:10:270
3172721180,2chrt31726-21seq23:24:370
1706221170,2chrt17061-21cat23:51:030
1106221170,3chrt11064-21seq22:05:180
910921160,2chrt9110-21chrt23:39:210
902121160,3chrt9020-21/usr/sbin/munin19:30:250
2290021160,2chrt22901-21sleep21:35:070
1381121160,2chrt13812-21/usr/sbin/munin21:21:470
3002321150,2chrt30018-21diskstats00:10:480
775221140,2sleep07749-21idleruntime00:26:000
2044521140,3chrt20446-21mailstats23:07:150
1704821140,3chrt17052-21sh00:40:010
896321130,2chrt8964-21runrttasks22:50:370
2057321110,2chrt20574-21sleep19:48:460
537821060,4chrt5379-21sleep21:08:450
700421010,2chrt7005-21sh20:19:280
1923521010,2sleep019237-21seq22:16:590
224921000,2chrt2250-21sh21:03:410
109642990,2sleep010966-21sed22:05:050
291822970,3chrt27456-21apt-get22:31:570
163292960,2sleep016332-21cut23:01:080
240412870,2chrt23956-21ntp_states23:12:500
122002870,2sleep012201-21chrt21:19:130
28440907817,11cyclictest11217-21df_inode00:31:110
2844090765,9cyclictest2949-21apt-get23:30:200
28440907612,10cyclictest27407-21memory00:06:190
28440907611,56cyclictest5194-21if_eth221:56:070
200012760,2sleep020002-21ssh23:55:430
2844090755,12cyclictest4042-21users22:42:260
2844090755,11cyclictest1960-21hddtemp_smartct21:51:370
2844090754,18cyclictest798-21ntpq19:16:450
2844090745,9cyclictest24331-21ps20:46:260
2844090745,13cyclictest7792-21ntpq21:12:210
2844090744,20cyclictest7757-21diskstats20:20:300
28440907413,10cyclictest29676-21apt-get21:46:460
68882730,1sleep06892-21chrt00:25:010
2844090736,12cyclictest14220-21sshd19:38:260
2844090735,19cyclictest17477-21munin-run22:15:030
2844090735,11cyclictest23107-21/usr/sbin/munin21:35:120
2844090734,12cyclictest25333-21sed22:26:050
28440907317,48cyclictest21296-21aten2.4_rfpower19:50:230
28440907313,51cyclictest3695-21seq19:21:000
25302730,2sleep02531-21seq00:17:370
2844090727,10cyclictest25516-21ntp_offset19:56:090
2844090726,11cyclictest9622-21apt-get23:40:270
2844090726,11cyclictest32733-21hddtemp_smartct23:25:560
2844090725,20cyclictest16695-21diskstats21:25:450
2844090725,12cyclictest13950-21df_inode20:30:290
2844090724,19cyclictest12145-21users20:26:290
2844090724,12cyclictest436-21runrttasks00:04:450
2844090717,9cyclictest11963-21apt-get22:55:210
2844090717,10cyclictest6635-21ntpq22:46:290
2844090715,55cyclictest16043-21ntpq19:40:520
2844090715,10cyclictest28194-21ntpq21:42:100
28440907116,10cyclictest25396-21/usr/sbin/munin23:16:410
28440907114,9cyclictest5685-21apt-get19:25:130
2844090706,11cyclictest28577-21apt-get19:10:160
2844090706,10cyclictest30536-21apt-get20:05:190
2844090705,9cyclictest29842-21ps20:55:450
2844090705,12cyclictest13585-21hddtemp_smartct23:45:590
2844090703,18cyclictest21274-21/usr/sbin/munin20:41:270
28440907014,9cyclictest16704-21/usr/sbin/munin20:35:390
28440907014,48cyclictest21445-21ssh22:20:460
2844090695,10cyclictest28599-21ntpq20:01:030
2844090694,19cyclictest28390-21latency_hist19:10:020
28440906913,10cyclictest26562-21seq20:50:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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