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2026-07-14 - 00:31

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Mon Jul 13, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2819823060,2sleep028200-21mailstats08:35:260
5698991167,15cyclictest23881-21/usr/sbin/munin12:30:250
353721160,3chrt3535-21sshd11:10:430
5698991156,13cyclictest4245-21latency_hist09:10:010
1869121150,4sleep018689-21ntp_states12:10:240
5698991148,90cyclictest31476-21/usr/sbin/munin10:55:130
5698991147,14cyclictest26514-21sh08:30:140
5698991138,92cyclictest28155-21/usr/sbin/munin10:40:250
5698991138,15cyclictest7074-21ntp_states11:25:210
5698991138,14cyclictest1649-21munin-run09:00:010
5698991137,15cyclictest12088-21sort09:40:010
5698991137,13cyclictest8590-21memory07:20:180
5698991136,13cyclictest30521-21/usr/sbin/munin08:45:180
2639521130,3chrt26396-21latency_hist08:30:010
5698991129,89cyclictest22420-21latency_hist10:20:010
5698991128,89cyclictest20997-21/usr/sbin/munin12:20:250
5698991127,15cyclictest12224-21cut07:35:020
5698991127,14cyclictest18887-21sh10:05:250
5698991126,14cyclictest12539-21ntpq07:35:220
56989911210,89cyclictest17267-21irqstats12:05:210
56989911210,88cyclictest2381-21users09:00:290
5698991119,15cyclictest16861-21seq12:04:010
5698991117,14cyclictest10952-21ntp_states11:40:210
5698991117,14cyclictest10926-21date07:30:020
5698991117,11cyclictest25106-21/usr/sbin/munin10:30:130
5698991116,16cyclictest24495-21runrttasks10:26:370
5698991116,15cyclictest30192-21/usr/sbin/munin10:50:130
5698991109,13cyclictest9266-21latency_hist11:35:020
5698991109,12cyclictest1803-21memory11:05:170
5698991108,88cyclictest20264-21/usr/sbin/munin12:15:300
5698991108,14cyclictest25437-21users12:35:290
5698991108,11cyclictest26607-21ntp_states10:35:210
5698991107,15cyclictest21258-21latency_hist08:10:020
5698991107,15cyclictest15883-21seq07:49:100
5698991107,14cyclictest14570-21sh11:55:130
5698991107,14cyclictest10139-21users09:30:290
5698991107,13cyclictest20596-21chrt10:11:290
5698991107,11cyclictest12001-21df11:45:130
5698991106,16cyclictest18341-21runrttasks10:04:060
5698991106,14cyclictest13483-21/usr/sbin/munin09:45:130
56989911023,75cyclictest6118-21/usr/sbin/munin07:10:240
5698991099,88cyclictest13533-21ntp_states11:50:250
5698991098,15cyclictest288-21snmpd09:17:580
5698991098,14cyclictest184642sleep007:59:180
5698991098,12cyclictest16270-21ntp_states09:55:210
5698991097,15cyclictest276-21runrttasks09:23:450
5698991097,14cyclictest22714-21irqstats08:15:180
5698991097,12cyclictest606-21ntp_states11:00:210
5698991096,14cyclictest23096-21chrt12:27:130
5698991096,14cyclictest19015-21sh08:00:260
5698991096,13cyclictest9396-21/usr/sbin/munin11:35:090
5698991096,13cyclictest7212-21if_eth007:15:180
5698991096,13cyclictest13990-21mailstats07:40:260
5698991089,15cyclictest31944-21ntp_states08:50:240
5698991088,87cyclictest5502-21/usr/sbin/munin11:20:210
5698991088,11cyclictest6350irq/103-63fec0009:40:170
5698991087,13cyclictest8323-21df_inode09:25:130
5698991087,13cyclictest29047-21grep08:40:100
5698991087,10cyclictest220462chrt08:11:460
5698991078,85cyclictest14764-21df_inode09:50:130
5698991078,12cyclictest22881-21mailstats10:20:250
5698991076,14cyclictest5513-21seq09:14:570
5698991067,14cyclictest29171-21/usr/sbin/munin10:45:220
5698991067,12cyclictest4761-21cat11:15:290
56989910615,81cyclictest16440-21open_inodes07:50:260
5698991059,84cyclictest24286-21sendmail_mailqu08:20:260
5698991056,13cyclictest5758-21cat07:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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