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2026-06-28 - 12:52

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 Sun Jun 28, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2742021290,2chrt27418-21ld20:56:130
2635521270,3chrt26350-21ld23:21:160
1402221220,3chrt14024-21modprobe22:15:010
424521190,2sleep04246-21chrt22:48:140
3236521180,2chrt32364-21ssh21:53:040
3076021180,1sleep030759-21seq23:28:020
1452721180,2sleep014528-21seq23:03:580
2552521170,2chrt25524-21/usr/sbin/munin20:01:320
2006421170,2chrt20063-21/usr/sbin/munin00:01:030
3158921160,2chrt31591-21fschecks_time22:40:520
2209421150,2chrt22088-21ntpq22:26:170
156121140,1sleep01562-21seq23:32:540
1030621130,1sleep010307-21fschecks_count21:20:530
2767421110,2sleep027675-21irqrtprio21:46:040
380321100,2chrt3802-21seq21:59:260
1251821100,2sleep012519-21ls00:38:100
3060921090,2sleep030610-21ntpq21:01:200
1110321080,3chrt11104-21seq23:47:150
2402321070,2chrt24022-21ssh00:06:420
309622990,2sleep030963-21cat22:40:060
59932970,2sleep05995-21seq00:28:390
246992950,2sleep024702-21aten2.4_rfpower22:30:490
82822930,2sleep08283-21apt19:35:000
231692920,2sleep023170-21latency_hist21:40:080
236912900,1sleep023692-21seq23:17:190
84432880,2sleep08446-21sed21:17:300
88362860,2sleep08839-21wc22:55:370
87732850,1sleep08775-21sort22:06:160
150652830,2sleep015066-21chrt23:53:250
78302820,1sleep07833-21cpuspeed20:25:260
272902810,2chrt27262-21ntpq00:11:380
239292800,1sleep023930-21chrt21:40:570
116692790,1sleep011673-21cut19:40:230
163392780,2sleep016341-21latency_hist21:30:060
11402780,2sleep01141-21chrt21:06:090
68002760,2sleep06801-21awk23:41:020
46572760,2sleep04656-21sshd23:37:230
307742690,1sleep030775-21chrt20:10:290
29742690,1sleep02977-21grep20:17:130
180042680,1sleep018005-21chrt23:09:220
140852670,2sleep014086-21chrt20:35:310
150112650,2sleep015009-21if_eth222:16:020
188832640,2sleep018881-21threads21:33:120
77562633,10sleep07802-21irqstats00:31:080
318782590,2sleep031879-21chrt00:18:550
51992583,9sleep05313-21irqstats20:20:460
274382584,8sleep027498-21aten2.4-expect20:05:250
16672573,9sleep01646-21ntp_states00:21:560
30922563,7sleep03032-21apt-get21:10:210
190312553,44sleep019059-21perl23:10:510
115032543,8sleep011504-21irqstats20:30:460
286932523,38sleep028079-21apt-get19:15:490
54592503,6sleep05452-21ssh22:01:160
25022905014,18cyclictest8456-21/usr/sbin/munin19:35:510
241572503,38sleep024167-21chrt20:50:580
203002490,2sleep020299-21seq19:53:560
174282480,1sleep017429-21seq23:56:490
2297024712,19sleep022973-21ntpq19:05:390
25022904416,21cyclictest0-21swapper22:24:560
2502290435,19cyclictest5841-21hddtemp_smartct22:50:560
238842420,2sleep023886-21latency_hist20:00:060
2502290414,18cyclictest3225-21memory19:25:500
2502290414,10cyclictest18721-21runrttasks20:42:070
25022904114,21cyclictest0-21swapper19:12:540
2502290405,27cyclictest31609-21/usr/sbin/munin19:20:340
2502290404,18cyclictest412-21snmpd20:47:470
158342400,2chrt15833-21seq19:46:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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