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2025-12-28 - 21:53

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 376 highest latencies:
System rackfslot4s.osadl.org (updated Sun Dec 28, 2025 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
987521270,2chrt9592-21apt-get09:06:020
861521270,2chrt8609-21awk07:20:000
427621200,2chrt3004-21apt-get12:11:350
2659721200,2sleep026605-21/usr/sbin/munin09:30:520
2685421190,3chrt26855-21sh11:56:520
453821170,2chrt4540-21wc10:35:030
79821150,2chrt31976-21apt-get12:06:350
520421150,3chrt5207-21fschecks_count10:35:520
1224021150,3chrt12241-21chrt09:57:230
2416221140,2chrt24163-21chrt07:45:010
3050021120,2chrt30501-21chrt09:36:110
117721120,1sleep01178-21runrttasks11:18:180
1077321120,3chrt8746-21/usr/sbin/munin11:32:250
409021110,3chrt4092-21chrt11:22:210
815121090,2sleep08152-21chrt08:10:450
47521090,2chrt474-21ssh09:40:320
1467921090,1sleep014715-21cat10:01:060
635021080,2sleep06351-21runrttasks09:48:530
1673421080,2chrt16735-21sleep07:31:440
1110921080,2sleep011108-21seq10:45:000
2949321070,3chrt29494-21sleep07:52:400
40921060,2chrt410-21sh07:58:280
759621050,2chrt7597-21grep12:16:270
69421050,2chrt695-21runrttasks10:28:560
1692421050,2sleep016925-21runrttasks10:53:030
1428221030,2chrt14283-21sh10:49:390
3088121010,2chrt30882-21sleep11:14:400
146392950,1sleep014636-21python309:12:290
122202950,1sleep012221-21aten2.4_rfpower11:35:320
203962920,2sleep020397-21basename12:35:370
306272870,2chrt30608-21ntpq08:46:110
30622850,1sleep03063-21chrt08:55:030
111832840,2sleep011184-21/usr/sbin/munin08:15:440
116002820,2sleep011601-21chrt12:21:390
3275027810,54sleep0322-21memory07:05:380
77982720,2sleep07796-21if_err_eth109:51:020
235432710,2sleep023544-21seq10:14:500
217652700,2sleep021766-21seq09:23:080
190512660,2sleep019053-21runrttasks10:07:170
249382630,1sleep024940-21latency10:16:110
186222634,9sleep018627-21smartctl07:35:400
157162630,2sleep015717-21chrt12:27:510
184062620,2sleep018407-21chrt12:32:000
197512610,2sleep019752-21basename10:57:150
72332603,8sleep07236-21memory09:00:500
294412590,2sleep029464-21runrttasks12:00:550
245562593,8sleep024560-21sshd11:53:360
224392570,2sleep022443-21seq11:01:160
227822560,3sleep022783-21chrt09:25:160
82712553,6sleep08274-21seq11:29:220
183352540,1sleep018336-21seq11:44:340
25582510,1sleep02557-21ld08:01:240
279412500,1sleep027942-21if_eth010:21:030
26232503,38sleep02651-21aten2.4-expect07:10:230
148572480,4chrt14855-21ld08:21:090
2423904417,21cyclictest0-21swapper11:49:470
242390438,18cyclictest25979-21ntpq11:06:360
2423904315,10cyclictest24478-21aten2.4_rfpower07:45:250
34182420,2sleep03419-21seq08:55:250
242390425,9cyclictest13052-21ntpq07:26:030
242390424,28cyclictest23421-21tune2fs08:35:370
2423904215,11cyclictest26273-21apt-get08:40:330
2423904211,24cyclictest0-21swapper08:30:400
242390415,17cyclictest17632-21ntpq09:17:000
242390414,19cyclictest4642-21df_inode08:05:310
242390406,13cyclictest10081-21ntpq07:21:250
242390383,9cyclictest17615-21irqstats08:25:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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