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2026-03-22 - 17:13

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 100 highest latencies:
System rackfslot4s.osadl.org (updated Sun Mar 22, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
962121200,2chrt9622-21runrttasks12:33:150
3258821200,3chrt32587-21cut11:30:540
2995621180,2chrt29947-21ntpq11:26:280
2584021160,2sleep025839-21seq12:09:080
1550721160,3chrt15508-21/usr/sbin/munin07:45:450
1331321160,3chrt13282-21ssh11:01:410
2499621150,2chrt24995-21awk09:42:240
316021140,2sleep03161-21runrttasks12:23:390
1904621140,2sleep019047-21runrttasks09:33:550
2335321130,2sleep023354-21runrttasks10:28:210
1627821130,3chrt16279-21sleep10:17:220
3050821120,2chrt30456-21ntp_states09:01:160
2780221120,3chrt27800-21if_can008:05:400
2082921110,2sleep020828-21seq10:25:040
1616821100,2chrt16169-21seq09:30:000
1243921100,1sleep012440-21chrt11:48:520
366321090,2chrt3664-21seq09:59:230
832721070,2chrt8328-21chrt10:54:580
2695921070,2chrt26960-21runrttasks08:55:440
2289621070,2chrt22897-21cat08:50:040
1969421040,2sleep019695-21cat11:11:430
201421010,2sleep02015-21chrt10:45:260
31612980,2sleep03162-21chrt11:35:150
272872970,2sleep027292-21irqrtprio12:11:050
115572920,2sleep011558-21seq08:31:090
229132910,2sleep022914-21sendmail-msp09:40:010
54082880,2sleep05410-21chrt09:13:200
53212790,2sleep05322-21cat10:01:130
281082790,1sleep028110-21grep10:35:500
320642780,2sleep032065-21seq09:53:020
75712770,1sleep07572-21sh08:25:300
5412770,2sleep0543-21sort12:20:060
245542740,2sleep024557-21wc08:51:290
262742730,2sleep026275-21seq10:32:250
24482730,2sleep02449-21chrt07:25:210
228782736,13sleep022880-21diskstats07:05:560
166152710,1sleep016616-21ldconfig11:06:400
231902690,1sleep023191-21collect211:16:170
178312690,1sleep017830-21ld11:56:370
170252660,2sleep017026-21chrt08:40:540
4932640,2sleep0494-21if_eth009:05:440
199382640,2sleep019939-21basename12:00:320
43692610,1sleep04370-21df_inode12:25:440
322712610,2sleep032272-21chrt07:20:360
17902610,2sleep01792-21latency_hist10:45:040
311052594,9sleep031218-21irqstats08:10:440
105042580,1sleep010505-21chrt12:35:060
224032573,9sleep022448-21sendmail_mailqu07:56:250
64202563,6sleep06317-21apt-get09:15:270
132042560,2sleep013269-21sort10:13:100
274552530,2sleep027458-21cut09:46:100
123032520,2sleep012304-21runrttasks09:23:450
120202480,2chrt12017-21/usr/sbin/munin07:40:260
25371904717,21cyclictest0-21swapper11:54:500
104902451,4sleep00-21swapper10:09:490
96912430,3sleep09692-21chrt07:35:560
2537190435,10cyclictest26802-21ntpq07:11:170
2537190424,19cyclictest26733-21ntpq11:21:380
2537190424,11cyclictest5234-21ntpq08:20:580
25371904215,8cyclictest9260-21ssh11:44:140
2537190414,20cyclictest9164-21fw_packets10:55:520
25371904117,17cyclictest13433-21/usr/sbin/munin08:36:260
2537190403,10cyclictest412-21snmpd08:16:310
25371904015,11cyclictest18014-21telnet07:50:240
2537190395,15cyclictest5486-21apt-get07:30:140
2537190394,9cyclictest29676-21ntpq07:15:560
2537190394,17cyclictest25799-21users08:01:310
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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