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2026-07-19 - 03:02

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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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 Sun Jul 19, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1036022550,2sleep010358-21entropy21:05:140
615922170,3sleep06158-21latency_hist22:55:010
1814321980,3sleep018146-21if_err_eth021:35:150
2333221300,4chrt23327-21ntp_states00:00:220
1772521230,4chrt17724-21sshd21:33:290
160121190,4chrt1602-21timerandwakeup22:35:270
2721221180,4chrt27214-21latency_hist20:05:020
2725721140,4sleep027258-21/usr/sbin/munin20:05:110
2233721140,3chrt22339-21tr21:50:260
815621130,4chrt8157-21mailstats20:55:270
2141821130,4sleep020808-21/usr/sbin/munin19:40:300
3224521120,4sleep032254-21memory00:35:180
134052960,4sleep013467-21/usr/sbin/munin21:15:320
196622940,4sleep019731-21/usr/sbin/munin23:45:280
14392920,3sleep01500-21tr20:30:190
12946998562,14cyclictest28080-21munin-run00:20:000
12946998562,13cyclictest31027-21df_inode22:25:140
12946998561,14cyclictest951-21munin-run22:35:000
12946998461,12cyclictest288-21snmpd00:25:160
12946998460,14cyclictest8713-21munin-run23:05:010
12946998359,13cyclictest25251-21users19:55:300
12946998258,14cyclictest28647-21ntp_states22:15:190
221702810,4sleep022232-21grep23:55:280
12946998058,12cyclictest12242-21chrt21:10:540
12946998057,13cyclictest15316-21chrt19:18:330
12946998057,12cyclictest14074-21chrt19:13:590
12946998055,14cyclictest7112-21seq20:51:190
12946997957,13cyclictest13012-21ntp_states23:20:230
12946997954,16cyclictest7287-21chrt22:59:140
12946997855,14cyclictest516-21ls20:25:270
12946997854,15cyclictest19739-21ps21:40:230
12946997854,14cyclictest25758-21irqstats00:10:170
12946997854,13cyclictest18978-21chrt23:44:330
12946997751,16cyclictest10166-21df23:10:120
12946997655,12cyclictest27355-21tr22:10:200
12946997654,13cyclictest20743-21ls19:40:030
12946997653,13cyclictest20975-21grep23:50:290
12946997651,14cyclictest2721-21/usr/sbin/munin20:35:190
12946997445,18cyclictest8835-21/usr/sbin/munin23:05:240
12946997353,12cyclictest19063-21sshd19:32:290
12946997351,12cyclictest22172-21forks19:45:150
309132720,2sleep030912-21wc22:25:020
12946997149,13cyclictest21233-21users21:45:320
303802690,3sleep030381-21ls20:15:260
12946996951,12cyclictest15353-21munin-run21:25:000
12946996646,11cyclictest15347-21df23:30:130
12946996445,12cyclictest31065-21ntp_states00:30:210
12946996343,12cyclictest16721-21irqstats23:35:190
12946996332,21cyclictest17076-21/usr/sbin/munin19:25:180
12946996229,21cyclictest4312-21/usr/sbin/munin20:40:270
12946996211,18cyclictest2851-21/usr/sbin/munin22:40:260
12946996143,11cyclictest288-21snmpd20:46:500
12946996135,15cyclictest23593-21/usr/sbin/munin21:55:260
1174726118,24sleep011797-21df19:05:110
1294699609,17cyclictest31145-21/usr/sbin/munin20:20:270
12946995942,10cyclictest16071-21users21:25:300
12946995935,15cyclictest16129-21/usr/sbin/munin19:20:260
12946995934,16cyclictest23965-21/usr/sbin/munin19:50:290
12946995928,21cyclictest3925-21/usr/sbin/munin22:45:200
1294699588,17cyclictest9130-21/usr/sbin/munin21:00:160
12946995834,14cyclictest14256-21/usr/sbin/munin23:25:200
12946995831,17cyclictest24600-21/usr/sbin/munin00:05:210
12946995817,13cyclictest276-21runrttasks23:15:390
12946995732,17cyclictest28521-21runrttasks00:20:250
12946995731,15cyclictest24567-21/usr/sbin/munin22:00:120
12946995728,20cyclictest26865-21runrttasks22:09:190
12946995631,16cyclictest29261-21runrttasks20:11:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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