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2026-06-14 - 04:16

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 Sun Jun 14, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3203921350,2chrt32026-21ntpq21:13:100
872921250,2sleep08730-21seq21:26:180
693621190,2chrt6854-21ntp_states22:12:140
2702021190,3chrt27021-21/usr/sbin/munin23:30:530
1595821190,3chrt15957-21/usr/sbin/munin20:47:130
3042821180,2chrt30427-21/usr/sbin/munin23:35:520
1497321180,2chrt14972-21seq19:55:140
252621150,2chrt2523-21ps23:42:110
2334821140,3chrt23349-21chrt22:36:360
142521130,3chrt1426-21sleep22:04:250
848621120,2chrt8487-21chrt23:02:490
2574721120,1sleep025748-21cpuspeed22:40:390
1683021100,2chrt16832-21sh23:15:550
2990121090,1sleep029902-21seq00:23:310
2018621080,2chrt20187-21sh19:10:430
1452721080,4chrt14528-21ssh22:23:420
1992021070,4chrt19921-21sh23:20:270
970221060,2chrt9703-21sleep23:05:240
211821050,2chrt2116-21ld21:16:280
436021020,2chrt4361-21sh19:37:020
20002970,2sleep02001-21chrt22:53:210
294452920,2sleep029446-21cat22:46:040
122012890,2sleep012202-21seq19:50:310
286242860,2chrt28605-21ntpq20:16:100
215782810,2sleep021579-21cat00:11:140
57172780,2sleep05716-21seq23:46:590
58702770,1sleep05871-21seq22:59:350
126502770,1sleep012648-21proc_pri21:32:170
249862760,2sleep024989-21sort21:51:020
273002740,2sleep027301-21cut20:15:020
164672748,18sleep016309-21apt-get19:05:380
97012730,2sleep09702-21seq23:52:580
24502730,2sleep02451-21tune2fs22:05:540
112472730,1sleep011248-21seq22:18:540
238842710,2sleep023886-21chrt21:49:320
135752710,2sleep013577-21cut23:10:520
64672670,2sleep06470-21cut19:40:500
28122660,2sleep02810-21ntp_kernel_err00:31:190
265326611,45sleep02659-21/usr/sbin/munin20:26:400
270592630,2sleep027060-21cat21:05:350
320142600,1sleep032015-21chrt19:30:250
161042600,2sleep016105-21sh00:02:230
229212594,45sleep022980-21grep19:15:350
50582583,7sleep05104-21head00:35:330
105472585,42sleep010518-21munin-run20:40:020
241062560,1sleep024107-21sh00:15:210
278112553,42sleep027846-21aten2.4-expect21:55:370
204202545,40sleep00-21swapper21:44:160
202222542,6sleep020220-21ssh22:32:000
291532524,41sleep029199-21fschecks_count19:25:340
19319905221,24cyclictest0-21swapper21:23:490
161872523,40sleep016225-21timerwakeupswit21:37:260
266492500,3chrt26646-21/usr/sbin/munin19:20:480
241532490,1sleep024156-21wc20:10:020
208092482,7sleep020816-21runrttasks20:55:330
19319904717,22cyclictest0-21swapper22:27:440
123712473,37sleep012355-21ntp_states23:57:050
250322460,2sleep025066-21timerandwakeup23:27:200
7802450,3sleep0775-21sshd00:28:330
19319904418,18cyclictest29604-21diskmemload00:05:250
1931990435,9cyclictest5738-21ntpq20:31:120
1931990425,9cyclictest9629-21irqstats19:45:440
1931990404,18cyclictest30862-21df_inode20:20:300
1931990397,13cyclictest18234-21irqstats20:50:470
1931990396,27cyclictest12472-21ntp_states20:42:010
1931990396,12cyclictest23578-21apt-get21:00:240
19319903716,14cyclictest0-21swapper20:00:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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