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2026-01-09 - 05:43

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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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 50 highest latencies:
System rackfslot4s.osadl.org (updated Fri Jan 09, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2489321330,2sleep024894-21fschecks_time20:46:270
685721300,2sleep06858-21sh23:34:570
794721270,2sleep07948-21ssh00:24:520
771821250,2sleep07720-21rm22:46:380
2371521250,2chrt23716-21seq21:34:220
585921220,2chrt5858-21/usr/sbin/munin21:56:020
2839521190,2chrt28396-21/usr/sbin/munin00:06:080
1785021190,1sleep017851-21runrttasks00:39:450
2724721180,3chrt27246-21/usr/sbin/munin22:27:210
1889821180,3chrt18873-21ntpq21:26:370
1114321180,3chrt11142-21seq00:29:340
2062521170,3chrt20626-21dpkg23:55:120
1650021170,2chrt16501-21sh23:00:320
1276621170,2sleep012763-21sh22:55:000
490721160,2chrt4908-21gcc22:42:450
3197121150,2chrt31972-21chrt22:35:120
1599621150,2chrt15995-21seq22:59:500
1022621150,2sleep010227-21runrttasks23:39:420
2887421140,2chrt28875-21seq23:18:520
435321130,3chrt4354-21chrt21:05:170
1831721130,2chrt18318-21runrttasks22:14:410
1541721130,3chrt15418-21ssh23:46:490
126621120,2sleep01267-21runrttasks00:14:520
3076921110,2chrt30766-21cat21:45:040
132021110,2chrt1321-21awk21:00:220
1289721100,2sleep012898-21chrt19:35:190
3119321090,2chrt31192-21seq22:33:410
1638221080,2chrt16383-21sleep21:22:510
3155821070,1sleep031559-21cat23:22:210
826621040,2chrt8267-21sleep19:26:590
1861621040,2chrt18617-21sleep19:44:140
1049621040,2chrt10497-21sleep20:22:470
323272980,2chrt32328-21sh20:56:510
111022930,2sleep011106-21tail21:15:360
40592910,2sleep04060-21chrt00:18:370
327032890,2sleep032704-21seq20:06:060
234422850,2sleep023444-21grep23:10:490
127292830,2sleep012730-21chrt19:35:020
305842810,3chrt30567-21ntpq19:10:500
141982790,1sleep014199-21seq22:08:100
45842720,2sleep04585-21chrt19:21:100
243542720,1sleep024355-21grep00:00:350
224762650,2sleep022478-21runrttasks22:20:470
298352630,1sleep029836-21chrt20:01:330
5422613,7sleep0548-21df_inode19:15:300
203112600,2sleep020312-21if_can023:06:000
125542570,1sleep012556-21ls23:42:230
157362552,7sleep015748-21ntpq20:31:030
220302540,2sleep022048-21cat19:50:040
258112533,7sleep025808-21ntpq21:37:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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