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2026-06-26 - 02:29

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 the 100 highest latencies:
System rackfslot4s.osadl.org (updated Thu Jun 25, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2945021440,2chrt29451-21ntpq07:27:110
155321320,2sleep01554-21seq12:32:410
1081121280,2chrt10812-21sh10:20:460
617921180,3chrt6180-21runrttasks10:13:310
331421170,2chrt3316-21runrttasks10:09:370
914321160,2sleep09145-21seq11:55:510
1324421150,3chrt13245-21fschecks_time09:35:540
71621140,2chrt714-21ntpq09:16:440
454221140,2sleep04543-21cat11:00:060
2850621130,3chrt28507-21sshd09:58:110
2870121120,2sleep028704-21chrt09:10:370
2215121120,2chrt22150-21seq09:49:150
2887421110,2chrt28872-21kernelversion11:36:090
364021100,2chrt3642-21cut12:36:050
3163421080,2chrt31635-21ssh11:40:490
2012221080,3chrt20123-21ssh10:35:010
1642921080,1sleep016430-21awk11:17:200
1141221080,2sleep011414-21cut11:10:320
475521070,2chrt4756-21sleep11:49:090
2199421070,2chrt21990-21if_eth111:26:040
3180221050,2chrt31804-21sed12:30:050
1202421050,2chrt12025-21sh09:34:030
2545621040,1sleep025459-21seq09:05:250
1905421040,3chrt19055-21sleep08:02:190
1805621040,2chrt18057-21runrttasks12:09:120
896221000,2sleep08966-21sed10:17:200
2315421000,3sleep023155-21seq12:16:220
86082980,2sleep08609-21chrt09:28:500
61982870,2sleep06196-21sh08:35:000
180352849,18sleep018072-21munin-run07:10:010
253762830,1sleep025377-21ld10:42:100
102162820,1sleep010215-21seq11:08:040
186372810,2sleep018638-21chrt12:10:180
78742750,1sleep07875-21sh11:53:410
246792750,2sleep024681-21wc09:52:260
229852740,2sleep022986-21sh10:39:000
30422730,2sleep03040-21python307:36:230
327512720,2sleep032753-21wc10:05:030
233522660,2sleep023353-21chrt08:10:190
273032650,1sleep027304-21basename10:45:330
194632650,2sleep019464-21gcc11:21:590
205662530,1sleep020567-21switchtime08:56:280
131122533,41sleep013107-21memory12:01:140
319882492,7sleep031992-21ntpq07:30:570
119552490,3chrt11937-21ntpq07:50:550
91472480,2sleep09149-21seq08:39:380
246662480,2chrt24661-21telnet11:30:320
185312482,6sleep018536-21sshd08:54:110
255942470,3chrt25576-21ntpq07:20:580
234342474,36sleep023438-21ntpq09:01:150
18118904718,22cyclictest0-21swapper09:43:100
18118904716,23cyclictest0-21swapper10:53:270
139812472,36sleep013976-21apt-get07:55:130
18118904519,17cyclictest25238-21/usr/sbin/munin12:22:190
13072453,35sleep01311-21ntpq08:26:000
18118904319,16cyclictest5364-21ssh09:24:030
18118904316,21cyclictest0-21swapper08:44:420
18118904315,9cyclictest5049-21diskstats07:40:330
18118904310,24cyclictest0-21swapper11:02:460
127772430,2sleep012776-21seq08:45:040
1811890425,28cyclictest29352-21munin-run08:20:020
1811890425,11cyclictest15120-21ntpq10:26:470
1811890424,18cyclictest19597-21ntpq07:11:230
18118904217,18cyclictest31828-21sh08:23:160
18118904115,8cyclictest8137-21diskstats07:45:310
1811890404,10cyclictest7315-21runrttasks07:19:470
1811890387,12cyclictest21855-21users08:06:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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