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2026-01-08 - 18:35

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 792 highest latencies:
System rackfslot4s.osadl.org (updated Thu Jan 08, 2026 12:44:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1785922670,1sleep017862-21chrt07:05:200
558621260,2chrt5580-21diskstats11:50:450
148521180,1sleep01486-21chrt11:44:420
399721170,4chrt3998-21seq12:36:420
1854721170,4chrt18548-21runrttasks11:21:290
774221160,2chrt7743-21runrttasks09:24:590
2925121160,3chrt29227-21ntpq10:46:550
93221150,1sleep0933-21runrttasks10:53:160
849821150,4chrt8499-21sleep07:41:070
2857821140,3chrt28580-21aten2.4_rfpower12:25:310
1845821140,2sleep018456-21ssh12:10:200
2777221120,2chrt27771-21cut11:35:310
1201821110,2chrt12019-21sh11:11:140
998621080,2chrt9988-21chrt10:17:550
87321080,3chrt874-21modprobe07:30:000
812921080,3chrt8130-21chrt08:35:020
341721080,1sleep03418-21runrttasks10:08:050
1046421080,2chrt10463-21ssh11:57:230
2945521070,2chrt29456-21sleep07:22:500
2254721070,3chrt22550-21ntp_kernel_pll_07:11:530
3225321060,2sleep032254-21cut12:30:490
124112990,2sleep012413-21ssh10:21:300
242162970,2sleep024217-21chrt09:49:410
264372940,2sleep026438-21rm11:32:370
209912910,2sleep020988-21apt11:25:110
8182870,2sleep0819-21ssh09:14:440
312162840,2sleep031217-21seq10:01:390
220492820,1sleep022053-21irqrtprio10:36:060
203312800,2sleep020332-21sh10:33:500
220812760,2sleep022084-21wc08:56:250
78982750,2sleep07899-21chrt11:05:510
21512750,2sleep02152-21/usr/sbin/munin08:25:270
135392700,2sleep013540-21chrt07:50:190
147732690,2sleep014774-21fschecks_time11:15:510
169522650,1sleep016953-21sh10:28:410
272122620,2sleep027213-21chrt09:05:250
261992620,1sleep026200-21chrt10:42:160
165012620,2sleep016502-21cat09:37:200
137252600,2sleep013728-21timerandwakeup12:02:210
218212593,9sleep021807-21ssh12:15:280
288762575,43sleep028879-21sleep09:57:380
54702550,1sleep05471-21sshd10:11:090
206292553,43sleep020717-21irqrtprio08:00:460
23372540,1sleep02338-21seq07:31:130
155102523,7sleep015506-21ntpq08:45:520
133372523,7sleep013340-21seq07:50:030
48732513,40sleep04978-21sed11:01:010
265592513,9sleep026563-21users09:52:230
177582513,8sleep017765-21seq12:08:570
22642502,7sleep02280-21idleruntime09:16:400
324212490,3chrt32419-21/usr/sbin/munin08:21:090
190022490,2sleep019003-21seq07:58:010
63242484,36sleep06329-21seq07:37:550
22302480,2chrt2219-21ssh10:56:070
92832472,37sleep09264-21ssh09:26:300
32862470,1sleep03287-21seq11:46:450
20757904616,22cyclictest0-21swapper12:23:040
125412462,36sleep012527-21ssh09:31:230
20757904412,15cyclictest0-21swapper09:43:570
20757904220,14cyclictest0-21swapper08:40:100
20757904216,8cyclictest29160-21ntpq08:15:590
20757904215,22cyclictest0-21swapper07:16:330
20757904112,13cyclictest23022-21runrttasks08:05:090
2075790405,26cyclictest8755-21hddtemp_smartct08:35:360
2075790394,27cyclictest25055-21ntp_states09:01:100
2075790384,27cyclictest26496-21/usr/sbin/munin08:11:240
199462382,27sleep00-21swapper08:53:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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