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2026-03-11 - 17:03

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 highest latencies:
System rack4slot6s.osadl.org (updated Wed Mar 11, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
200022540,4sleep01997-21cat12:10:170
264622450,2sleep02644-21grep08:00:250
20425214018,31sleep020475-21df07:05:120
383221120,3chrt3833-21processes08:05:240
368921120,4chrt3687-21ls12:15:270
848421110,3chrt8485-21cat12:35:190
2867221100,3chrt28670-21switchtime07:35:270
1760621100,3chrt17607-21latency_hist09:00:020
1261621090,4chrt12612-21ntpq10:45:200
2706021010,4sleep027125-21/usr/sbin/munin09:35:250
59852980,3sleep05987-21grep12:25:190
242032940,4sleep024207-21df09:25:130
112012940,4sleep011205-21latency10:40:170
296422920,4sleep029715-21/usr/sbin/munin11:50:290
74722900,3sleep07540-21sed12:30:250
283262900,4sleep028331-21/usr/sbin/munin09:40:250
147452890,4sleep014746-21sshd08:48:180
316352830,2chrt31637-21latency_hist12:00:010
202592834,8sleep020268-21memory11:15:210
88292800,3sleep08846-21/usr/sbin/munin08:25:170
282392790,3sleep028292-21mailstats11:45:250
150892734,56sleep015134-21df08:50:110
324852713,5sleep00-21swapper09:55:300
21620996732,25cyclictest797-21/usr/sbin/munin12:05:180
21620996731,28cyclictest18068-21/usr/sbin/munin09:00:240
21620996435,20cyclictest16304-21/usr/sbin/munin11:00:120
21620996230,21cyclictest25565-21/usr/sbin/munin11:35:240
21620996223,27cyclictest17586-21/usr/sbin/munin11:05:170
2162099619,14cyclictest721-21egrep10:00:100
21620996035,16cyclictest7767-21/usr/sbin/munin10:25:270
21620996011,21cyclictest5763-21munin-run10:20:000
21620995911,16cyclictest9923-21/usr/sbin/munin08:30:240
2162099589,17cyclictest26856-21ntp_states11:40:240
2162099589,16cyclictest23058-21df07:15:110
2162099589,15cyclictest29311-21/usr/sbin/munin09:45:180
2162099588,17cyclictest25129-21munin-run11:35:000
2162099588,15cyclictest867-21/usr/sbin/munin07:55:270
21620995810,15cyclictest18850-21df_inode11:10:120
21620995810,14cyclictest4617-21memory12:20:170
2162099578,17cyclictest22730-21df11:25:120
2162099578,17cyclictest21721-21/usr/sbin/munin07:10:260
2162099578,17cyclictest21544-21/usr/sbin/munin09:15:260
2162099578,16cyclictest22867-21/usr/sbin/munin09:20:280
2162099578,15cyclictest8470-21grep10:30:100
21620995736,14cyclictest3065-21runrttasks10:09:110
21620995733,14cyclictest6367-21/usr/sbin/munin08:15:230
21620995732,16cyclictest7504-21runrttasks08:20:150
21620995730,17cyclictest3424-21/usr/sbin/munin10:10:140
21620995730,17cyclictest25296-21runrttasks07:23:310
21620995711,18cyclictest20784-21wc09:10:270
2162099569,15cyclictest25432-21/usr/sbin/munin09:30:150
2162099569,13cyclictest6183-21ntp_states10:20:210
2162099568,15cyclictest477-21seq07:52:530
2162099567,17cyclictest9750-21/usr/sbin/munin10:35:140
2162099567,15cyclictest30761-21/usr/sbin/munin07:45:170
2162099566,16cyclictest21812-21awk11:20:250
21620995632,15cyclictest15156-21/usr/sbin/munin10:55:200
21620995610,19cyclictest19491-21/usr/sbin/munin09:05:290
21620995610,18cyclictest13683-21/usr/sbin/munin10:50:110
2162099559,15cyclictest25722-21if_eth007:25:170
2162099559,15cyclictest11349-21irqstats08:35:150
2162099559,13cyclictest31998-21ntp_states12:00:210
2162099558,16cyclictest27019-21/usr/sbin/munin07:30:140
2162099558,16cyclictest12726-21/usr/sbin/munin08:40:190
2162099558,14cyclictest30592-21/usr/sbin/munin09:50:260
2162099557,18cyclictest4755-21/usr/sbin/munin08:10:200
21620995532,15cyclictest29549-21/usr/sbin/munin07:40:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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