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2026-05-12 - 01:13

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 May 11, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1877622570,2sleep018775-21sshd07:50:180
3175222520,2sleep031756-21netstat08:40:200
688522490,3sleep06884-21sort09:10:160
2387021220,4chrt23867-21ntp_states10:15:230
2107821200,4chrt21075-21ntpq12:10:200
1815121130,3chrt18150-21sed12:00:020
2170721110,4sleep021769-21users08:00:280
1053721050,3sleep010548-21df11:30:120
2764921000,3sleep027659-21missed_timers10:30:200
215262967,12sleep021598-21users10:05:290
175532940,2sleep017552-21netstat07:45:200
131282940,5sleep013167-21latency_hist09:35:020
111632910,4sleep011207-21/usr/sbin/munin07:20:250
237002900,4sleep023711-21ntp_states12:20:220
208932900,3sleep020933-21latency_hist10:05:020
82262840,4sleep08260-21latency09:15:160
275762806,61sleep027625-21ps12:35:260
259862784,63sleep025987-21sendmail-mta10:24:330
696127220,30sleep07011-21df07:05:130
13932684,55sleep0288-21snmpd08:49:150
138152685,51sleep013840-21users09:35:280
8156996727,15cyclictest7760-21cron11:20:000
36942623,8sleep00-21swapper08:57:020
815699609,17cyclictest8259-21/usr/sbin/munin07:10:230
815699599,19cyclictest15842-21/usr/sbin/munin09:45:280
815699599,18cyclictest27639-21/usr/sbin/munin08:25:190
8156995933,17cyclictest27212-21runrttasks08:22:350
8156995933,17cyclictest26471-21/usr/sbin/munin12:30:290
815699588,15cyclictest28923-21/usr/sbin/munin08:30:210
815699587,17cyclictest17127-21/usr/sbin/munin09:50:160
8156995831,18cyclictest0-21swapper10:25:120
815699579,17cyclictest1441-21/usr/sbin/munin10:55:200
815699578,17cyclictest25500-21cut08:15:240
815699577,16cyclictest22351-21df_inode10:10:130
8156995733,15cyclictest23803-21/usr/sbin/munin08:10:120
8156995732,16cyclictest22177-21/usr/sbin/munin12:15:140
8156995731,17cyclictest2809-21/usr/sbin/munin11:00:130
8156995720,13cyclictest15877-21sendmail07:40:010
8156995710,15cyclictest4211-21/usr/sbin/munin09:00:130
8156995710,15cyclictest14372-21/usr/sbin/munin11:45:190
8156995710,15cyclictest11781-21/usr/sbin/munin11:35:200
815699569,16cyclictest1907-21ntpq08:50:200
815699569,15cyclictest32714-21/usr/sbin/munin10:50:160
815699569,15cyclictest18523-21awk12:00:210
815699568,15cyclictest10686-21/usr/sbin/munin09:25:200
815699568,14cyclictest16022-21/usr/sbin/munin07:40:250
8156995632,15cyclictest4370-21/usr/sbin/munin11:05:240
8156995632,15cyclictest23535-21runrttasks08:09:180
8156995632,15cyclictest14834-21/usr/sbin/munin09:40:200
8156995631,16cyclictest14139-21runrttasks11:44:120
8156995630,16cyclictest5617-21runrttasks09:05:160
8156995621,14cyclictest8790-21sshd11:22:360
8156995610,16cyclictest15938-21ntp_states11:50:210
815699559,14cyclictest30784-21/usr/sbin/munin08:35:280
815699558,16cyclictest10650-21sshd07:19:370
815699558,15cyclictest31627-21ntp_states10:45:240
815699558,15cyclictest30049-21/usr/sbin/munin10:40:140
815699556,17cyclictest19679-21/usr/sbin/munin12:05:160
8156995530,16cyclictest5638-21/usr/sbin/munin11:10:250
8156995530,16cyclictest29034-21runrttasks10:35:230
8156995529,18cyclictest20014-21irqstats07:55:160
8156995510,15cyclictest276-21runrttasks09:56:120
815699548,15cyclictest25669-21seq12:28:280
815699548,15cyclictest13426-21/usr/sbin/munin07:30:160
815699547,15cyclictest9213-21/usr/sbin/munin11:25:290
8156995430,16cyclictest9530-21if_eth009:20:150
8156995430,15cyclictest12786-21runrttasks07:25:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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