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2026-05-28 - 14:24

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 Thu May 28, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2779021190,2sleep027791-21seq21:51:010
2601521180,3chrt26016-21runrttasks21:48:050
1430321170,1sleep014307-21chrt22:19:380
1231321170,2chrt12317-21timerandwakeup20:36:300
1974121150,2chrt19736-21ps22:27:140
1681921140,2chrt16821-21timerwakeupswit19:51:270
66021130,2chrt662-21mailstats22:47:150
2074021130,2chrt20742-21sleep21:40:380
955921120,1sleep09560-21chrt21:23:430
891221120,3chrt8910-21/usr/sbin/munin00:37:000
662721120,2chrt6628-21sh21:19:430
3263421120,3chrt32635-21rm00:24:160
2262421120,2chrt22623-21seq19:10:160
960821110,2chrt9606-21if_eth123:01:020
2519321110,3chrt25194-21sleep00:12:270
1946321110,2sleep019465-21ntp_kernel_pll_19:56:020
715221090,2chrt7146-21awk00:35:010
425721090,2chrt4259-21sleep22:04:240
1525821080,2sleep015259-21collect221:32:020
202121060,3chrt2022-21sleep23:37:360
2430521050,2chrt24306-21seq22:34:420
2891321020,2sleep028914-21seq23:30:040
23892960,2sleep02390-21vmstat21:12:400
229192880,2sleep022922-21cut20:01:260
292392850,2sleep029240-21chrt21:05:050
247172850,2sleep024718-21seq22:35:240
116442850,2chrt11618-21ntpq21:26:310
282682840,1sleep028269-21aten2.4_rfpower22:40:350
270122790,2sleep027014-21fschecks_count00:15:510
237862760,2sleep023787-21uname23:21:560
77952750,2sleep07796-21seq20:30:250
205992748,54sleep020612-21ld19:06:100
56632730,1sleep05666-21cut22:06:060
46402730,2sleep04641-21chrt23:41:360
170682720,2sleep017067-21sshd21:35:210
73622670,2sleep07363-21mii-tool23:46:020
208342660,2sleep020836-21irqrtprio00:06:060
174552640,1sleep017456-21seq20:45:370
246222630,1sleep024625-21mailstats20:56:250
317632590,1sleep031766-21ntp_kernel_err20:15:500
43452580,3sleep04349-21chrt20:25:000
88492573,44sleep08800-21apt-get19:40:190
116232570,2sleep011625-21proc_pri23:52:140
171142560,1sleep017111-21tune2fs00:00:520
151372560,2sleep015139-21timerandwakeup23:57:230
38942552,6sleep03892-21ntpq19:31:200
305192553,44sleep030510-21ntpq23:31:460
4682540,2sleep0469-21chrt21:58:190
309592542,8sleep030967-21ntpq21:06:470
74222533,42sleep07474-21sort22:57:240
150622530,2sleep015058-21ssh23:09:130
130072533,8sleep013057-21/usr/sbin/munin19:46:320
22464905221,22cyclictest0-21swapper22:54:480
207782510,2sleep020779-21chrt23:17:180
271032492,40sleep027107-21runrttasks20:09:020
158882480,2chrt15886-21/usr/sbin/munin22:21:170
22464904719,21cyclictest0-21swapper23:13:280
153732470,2chrt15371-21/usr/sbin/munin20:41:290
2246490446,10cyclictest21288-21ntp_states20:51:110
22464904419,15cyclictest28826-21/usr/sbin/munin19:20:260
287872430,2sleep028788-21chrt20:11:020
22464904314,10cyclictest7327-21users19:36:320
22464904214,21cyclictest0-21swapper22:13:490
2246490415,29cyclictest28639-21apt19:20:000
22464904116,18cyclictest412-21snmpd00:26:250
22464903915,18cyclictest31929-21apt-get19:25:200
2246490376,11cyclictest5389-21irqstats20:25:440
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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