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2026-06-23 - 02:23

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 Mon Jun 22, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
122521330,2sleep01227-21cut09:21:120
512521220,4chrt5126-21/usr/sbin/munin09:27:060
2333221210,2chrt23330-21sshd12:20:390
2853621190,4chrt28534-21python308:21:240
89621170,3chrt894-21ld11:46:330
1723221170,3chrt17234-21tr07:11:240
2875421160,2chrt28755-21seq09:14:230
1443521140,2chrt14433-21if_eth109:41:010
128621140,2sleep01287-21seq10:58:540
3227521130,2chrt32274-21seq12:34:070
1868421130,2chrt18685-21chrt09:47:110
320221100,1sleep03204-21cpu11:50:360
2416121100,2chrt24163-21sleep10:45:010
1885821090,2chrt18857-21seq07:15:110
1752521070,2chrt17526-21ps11:23:020
1344221070,1sleep013444-21apt09:40:010
1252721070,2chrt12528-21sleep10:26:450
2307721040,2chrt23078-21chrt09:54:170
105621030,2sleep01059-21sort12:35:580
2046921010,2sleep020475-21chrt10:39:160
1812221000,3sleep018120-21mailstats12:12:150
312932990,2sleep031294-21seq09:17:290
133522970,2sleep013353-21ld11:16:410
319672950,2sleep031968-21chrt10:07:130
84112930,2sleep08412-21seq11:57:570
245042920,2sleep024506-21cut09:56:020
145232890,2sleep014524-21chrt12:06:560
26022860,2sleep02603-21cut11:00:520
118472840,2sleep011845-21smart_sda12:03:060
101082840,1sleep010111-21latency_hist09:35:080
99802820,2sleep09982-21chrt10:22:540
285392770,4chrt28531-21df_inode07:30:290
220312770,2sleep022032-21seq07:20:170
318552760,1sleep031858-21chrt11:45:040
213052760,2sleep021306-21chrt11:28:430
19562760,1sleep01958-21chrt07:40:090
192462730,2sleep019247-21seq08:59:280
99882720,2sleep09989-21collect211:11:360
160882650,2sleep016086-21pluginstate10:32:130
211152620,2sleep021116-21chrt08:10:390
42962610,2sleep04297-21tune2fs08:35:350
269962610,2sleep026997-21chrt10:00:240
82212593,46sleep08224-21seq07:50:220
259772585,45sleep025985-21sh10:47:070
71802560,1sleep07181-21chrt08:40:240
55332563,9sleep05535-21memory10:16:120
186212563,8sleep018616-21ntpq08:06:010
66742553,42sleep06664-21ntpq11:06:370
279012550,1sleep027903-21chrt12:27:080
212192544,42sleep021224-21ssh12:17:050
138582520,1sleep013859-21seq08:50:420
102552520,2sleep010256-21aten2.4_rfpower08:45:240
236622502,41sleep023667-21ssh11:32:040
288982493,8sleep028799-21ssh10:51:480
1391924811,22sleep013964-21python307:05:590
15623904515,23cyclictest0-21swapper10:13:400
312872434,31sleep031294-21ntpq08:26:040
1562390434,20cyclictest26392-21ntp_states07:26:190
112862433,33sleep011271-21apt-get07:55:150
1562390425,18cyclictest20897-21ntpq09:01:100
15623904213,20cyclictest0-21swapper11:37:560
1562390416,10cyclictest6188-21ntpq07:46:020
15623904118,16cyclictest0-21swapper08:30:330
1562390405,16cyclictest32383-21ntpq07:35:570
15623904014,18cyclictest15774-21proc_pri08:01:240
1562390394,16cyclictest25326-21ntpq08:16:500
1562390384,17cyclictest23651-21seq09:05:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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