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2026-08-01 - 16:28

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 all highest latencies:
System rackfslot4s.osadl.org (updated Sat Aug 01, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1573221250,2chrt15734-21timerandwakeup09:22:190
2533521240,2chrt25336-21grep08:46:250
58921180,3chrt590-21runrttasks09:48:570
86221170,3chrt863-21ld11:26:260
2356521170,1sleep023587-21date09:35:040
1030721170,2chrt6741-21diskmemload12:30:050
3237921160,3chrt32376-21ntpq10:36:250
2713421160,2chrt27130-21ps11:17:130
2547621080,4chrt25477-21sh12:03:340
1275521080,2chrt12756-21sh12:33:110
2021821070,3chrt20216-21uptime07:46:300
1441221070,2chrt14413-21chrt10:58:070
1574121060,2sleep015742-21chrt12:37:250
3141321050,2chrt31414-21sleep07:14:050
767021040,3chrt7671-21sh08:18:480
408721040,3chrt4088-21sh10:42:340
377221010,2chrt3773-21sh09:53:380
666921000,2chrt6670-21sh09:09:520
3020721000,2chrt30208-21runrttasks10:33:200
62932990,2sleep06295-21fschecks_time10:46:260
9072980,3sleep0908-21basename09:00:260
157012950,1sleep015702-21chrt08:31:050
148212940,2sleep014822-21seq11:47:160
196122900,2sleep019615-21cut11:06:050
302102860,1sleep030211-21chrt09:45:010
32072850,2sleep03208-21chrt08:11:000
104612840,2sleep010462-21seq10:52:100
266852830,1sleep026686-21seq09:39:410
80162820,1sleep08017-21collect211:37:080
309242810,1sleep030925-21chrt12:11:310
252242810,2sleep025225-21seq11:15:050
179382800,2sleep017945-21sed09:26:040
72982760,2sleep07299-21seq09:59:090
2870190765,51cyclictest25711-21ntpq10:26:220
94912740,2sleep09492-21ld10:02:010
2870190745,49cyclictest17634-21apt10:15:000
2870190736,56cyclictest31750-21apt-get07:15:220
2870190736,46cyclictest21911-21apt-get07:50:390
156382730,1sleep015641-21aten2.4_rfpower11:00:340
2870190729,48cyclictest21068-21ssh10:20:050
2870190726,45cyclictest21064-21ntpq11:56:440
2870190725,57cyclictest2695-21apt-get11:30:570
2870190717,52cyclictest31450-21apt-get08:05:150
2870190716,53cyclictest3789-21apt-get12:20:260
2870190715,58cyclictest10164-21chrt07:31:010
2870190715,47cyclictest21116-21diskstats08:40:340
2870190715,46cyclictest13276-21ntpq07:36:020
2870190714,56cyclictest26586-21telnet12:05:350
28701907117,45cyclictest18034-21/usr/sbin/munin11:52:120
2870190706,52cyclictest8318-21apt-get08:20:150
2870190705,56cyclictest29961-21ntpq11:21:230
2870190705,45cyclictest28139-21apt07:59:590
2870190705,44cyclictest12491-21ntpq08:25:560
2870190704,56cyclictest11618-21df_inode10:05:430
2870190704,48cyclictest18766-21chrt08:36:010
28701907014,48cyclictest8863-21python309:12:280
28701907011,51cyclictest16397-21cat07:41:350
2870190697,53cyclictest21759-21ssh10:20:550
2870190697,52cyclictest10364-21apt-get09:15:200
2870190696,44cyclictest859-21df12:15:400
2870190694,47cyclictest6447-21hddtemp_smartct07:25:370
2870190694,44cyclictest28149-21ntpq08:51:080
2870190693,56cyclictest11313-21ssh11:42:020
2870190685,54cyclictest31287-21ntpq08:56:110
2870190664,54cyclictest3128-21cpu07:20:250
2870190664,46cyclictest28428-21aten2.4_rfpower08:00:250
2870190614,48cyclictest28642-21latency_hist07:10:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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