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2026-07-25 - 18:17

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 376 highest latencies:
System rackfslot4s.osadl.org (updated Sat Jul 25, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1974021190,3chrt19742-21latency_hist09:30:060
666821180,2chrt6669-21latency_hist12:25:040
961821170,2chrt9619-21chrt07:30:450
1831121170,2chrt18312-21runrttasks07:45:280
1116621170,4chrt11168-21runrttasks10:05:220
660421150,2chrt6602-21if_err_can011:36:010
166821150,2chrt1669-21sleep12:16:510
3050921140,2chrt30510-21sleep08:55:500
1230521140,2chrt12307-21cut10:55:510
2789621120,2sleep027897-21chrt08:00:370
1841321110,2sleep018414-21chrt11:05:100
219021080,2chrt2191-21runrttasks11:29:360
788921070,2sleep07890-21seq10:49:060
1017021050,2sleep010171-21seq12:30:230
1757321040,2chrt17574-21runrttasks11:03:250
116121020,2chrt1162-21sleep07:16:490
1117321010,2sleep011178-21wc11:42:240
1416421000,2sleep014167-21cut09:21:090
266272990,2sleep026628-21seq09:40:290
112472930,2sleep011248-21collect209:16:470
295822880,2sleep029580-21nfs4_client11:21:140
70242790,2sleep07026-21head12:25:350
63492790,2sleep06352-21wc09:58:020
179212780,1sleep017920-21cut10:15:330
36672750,2sleep03668-21chrt07:21:010
267132730,2sleep026714-21sh11:17:080
247022710,2sleep024703-21ssh11:14:400
122282710,2sleep012225-21fschecks_count07:35:350
232062700,2sleep023207-21date08:45:030
173172700,2sleep017319-21aten2.4_rfpower08:35:260
304792680,2sleep030482-21cut12:11:520
238892630,3chrt23858-21ntpq12:01:370
26592610,2sleep02677-21tr10:41:040
21272610,1sleep02130-21cut08:11:290
39132600,2sleep03914-21seq09:55:040
136552600,1sleep013656-21chrt11:46:130
82102573,8sleep08178-21ssh10:00:560
76222570,1sleep07620-21memory09:11:210
292662570,2sleep029267-21aten2.4_rfpower07:11:160
247672554,42sleep024773-21df_inode10:25:450
248732534,39sleep024791-21ntp_states09:37:160
232602523,8sleep023266-21chrt10:22:550
92282510,3chrt9226-21/usr/sbin/munin10:51:050
61132513,7sleep06114-21users08:16:340
309822502,38sleep030968-21ssh10:35:150
273022490,2chrt27276-21ntpq12:06:490
159872494,7sleep015989-21ntp_states10:12:040
28404904819,22cyclictest0-21swapper11:34:320
2672224812,19sleep026753-21python307:06:010
78692474,33sleep07822-21apt-get08:20:240
309922470,2sleep030993-21chrt08:05:390
213222472,6sleep021324-21ssh09:31:510
203542470,2chrt20297-21ssh11:56:170
181512463,35sleep0412-21snmpd11:53:050
294442442,35sleep029378-21ssh10:32:160
2840490435,19cyclictest26770-21df_inode08:50:320
2840490434,19cyclictest6611-21memory07:25:500
163672430,2sleep016364-21ssh12:39:410
2840490424,18cyclictest25504-21ntp_states07:56:120
2840490424,10cyclictest22045-21irqstats07:50:460
236702420,3sleep023665-21sshd08:45:300
305332412,32sleep030532-21ssh09:46:010
2840490415,16cyclictest11968-21ntpq08:25:570
2840490403,10cyclictest14530-21hddtemp_smartct08:30:390
28404904018,15cyclictest0-21swapper09:05:260
22902392,4sleep00-21swapper09:02:440
28404903813,18cyclictest16022-21awk07:40:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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