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2026-04-01 - 00:44

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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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 highest latencies:
System rackfslot4s.osadl.org (updated Tue Mar 31, 2026 12:44:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2900122480,2chrt29000-21chrt07:05:180
2044421240,2chrt20442-21ssh12:39:370
1865721200,2chrt18652-21diskstats10:10:440
1857621200,2sleep018577-21runrttasks10:58:480
1400421190,2chrt14002-21munin-plugin-st12:30:010
2328421160,2chrt23280-21ps10:17:150
2104921160,3chrt21048-21/usr/sbin/munin11:02:130
2586521140,1sleep025867-21cut10:21:040
2789821130,3chrt27899-21runrttasks07:54:350
1086021130,3chrt10861-21cat11:36:040
2521021120,2chrt25209-21seq11:08:460
2351221120,2sleep023511-21seq08:39:160
225721120,3sleep02258-21chrt10:34:520
2089521120,1sleep020889-21ps11:51:030
99321110,2chrt994-21runrttasks12:10:280
2917321090,2chrt29175-21sleep10:26:270
1925321090,2sleep019254-21seq09:22:370
1492921090,3chrt14930-21sleep11:41:470
3208221080,2chrt32079-21ld09:41:480
2572721080,3chrt25726-21seq11:58:110
2279321080,3chrt22795-21mailstats09:28:050
744621040,2chrt7447-21runrttasks09:05:240
697021040,2sleep06968-21ssh09:52:490
3035021040,1sleep030353-21sed11:16:090
20632920,1sleep02064-21tune2fs09:45:510
66132870,2chrt6584-21df10:41:010
113182870,2sleep011319-21chrt10:00:060
153882860,1sleep015389-21seq10:54:070
43332830,2sleep04329-21sendmail_mailtr10:37:140
31672830,2sleep03168-21chrt08:06:020
31964907917,53cyclictest10219-21diskmemload12:00:370
241612790,2sleep024162-21aten2.4-expect08:40:240
31964907815,53cyclictest11277-21irqrtprio09:11:100
3196490775,13cyclictest14629-21ps09:16:090
33432750,3sleep03344-21chrt07:15:340
3196490755,50cyclictest15491-21ntpq12:31:290
277832750,2sleep027784-21seq11:12:160
183392750,2sleep018340-21chrt11:46:590
159232750,2sleep015924-21cat10:06:440
3196490745,58cyclictest412-21snmpd10:46:430
3196490736,57cyclictest9576-21users12:22:250
3196490734,10cyclictest29753-21sleep07:56:260
31964907316,49cyclictest7969-21ntpq11:31:160
31964907316,47cyclictest8221-21/usr/sbin/munin08:15:420
3196490727,9cyclictest7245-21ntpq07:21:020
3196490727,10cyclictest31286-21irqstats08:50:430
3196490726,12cyclictest3865-21df11:25:400
3196490725,56cyclictest16721-21ntpq07:36:010
3196490724,59cyclictest32681-21ssh11:20:250
3196490724,12cyclictest11620-21runrttasks10:00:340
303302720,2sleep030331-21seq09:39:570
3196490717,55cyclictest31622-21telnet08:00:260
3196490716,8cyclictest5755-21uname12:16:550
3196490715,7cyclictest12150irq/30-fotg210_09:00:130
3196490715,10cyclictest25537-21ntp_states09:32:040
3196490714,12cyclictest7315-21runrttasks08:55:430
3196490714,10cyclictest12866-21df_inode07:30:320
31964907114,10cyclictest32303-21/usr/sbin/munin07:11:400
31964907113,9cyclictest412-21snmpd08:20:450
278882710,1sleep027890-21grep08:46:170
3196490705,55cyclictest31569-21ntpq12:06:530
3196490704,10cyclictest9017-21apt-get07:25:130
3196490704,10cyclictest19075-21df07:40:300
31964907017,45cyclictest5208-21aten2.4_rfpower08:10:230
31964907015,10cyclictest17783-21/usr/sbin/munin08:31:190
3196490694,10cyclictest15558-21ntpq08:26:000
31964906915,45cyclictest21941-21aten2.4_rfpower07:45:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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