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2026-07-05 - 06:12

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 Jul 05, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1773221340,4chrt17730-21fw_packets22:10:540
528821280,2chrt5289-21latency_hist23:30:040
716121260,2chrt7157-21ps23:32:160
2909021210,2chrt28996-21ssh22:27:220
110721190,2chrt1089-21munin-run22:35:020
987321180,2chrt9874-21sleep23:36:160
2080721180,2chrt20808-21sleep23:04:300
2006221170,2chrt20061-21/usr/sbin/munin21:26:050
432921150,2chrt4330-21sh22:39:530
3074321140,2sleep030744-21cat00:07:220
1623121140,3chrt16232-21runrttasks22:08:250
2391621130,3chrt23917-21runrttasks23:08:590
2855721120,3chrt28558-21sleep00:04:520
499821110,2chrt5000-21sleep21:51:490
1054721110,2chrt10548-21chrt22:48:480
426321100,2chrt4264-21chrt00:16:230
172521090,3chrt1727-21awk19:15:260
160621090,2chrt1607-21sleep20:06:170
3183021080,2chrt31832-21grep19:10:480
2026521080,1sleep020267-21fschecks_count20:35:350
2499621050,3chrt24997-21sleep23:10:450
1194521040,2chrt11946-21rm00:27:560
857821030,2chrt8579-21runrttasks00:22:510
1202521030,2sleep012026-21chrt21:14:190
493221000,2chrt4933-21sh21:02:260
72432970,1sleep07244-21chrt20:15:220
264022940,2sleep026403-21chrt21:35:460
147272930,2sleep014730-21sh00:32:130
140512930,2sleep014052-21timerwakeupswit23:42:220
318052920,2sleep031808-21grep21:43:130
89532860,1sleep08955-21mailstats21:57:150
314152860,2sleep031416-21seq23:20:320
182342850,2sleep018235-21rm23:49:240
17142850,2chrt1700-21users00:12:260
177192830,1sleep017722-21munin-plugin-st23:00:010
257322790,1sleep025734-21ls22:22:200
273172780,2sleep027318-21chrt20:46:110
54042740,2sleep05406-21cut19:20:430
220682700,2sleep022067-21ntpq22:17:060
293312670,2sleep029332-21rm23:16:470
258112660,1sleep025813-21sort21:35:050
263972650,2sleep026398-21chrt19:55:020
298422570,2sleep029843-21date20:00:070
27462570,2sleep02748-21chrt21:48:200
215182562,44sleep021526-21ntpq19:46:050
191102560,2sleep019109-21seq21:25:040
221812522,6sleep022097-21ssh23:55:180
143242522,6sleep012524-21/usr/sbin/munin21:17:210
301492513,7sleep030152-21memory20:50:500
201912512,6sleep020184-21ntpq23:51:500
195392502,41sleep019557-21wc00:40:060
63982483,38sleep06405-21sleep21:05:320
30695904817,23cyclictest0-21swapper22:50:090
317312473,6sleep031726-21ntp_states20:02:090
30695904717,23cyclictest0-21swapper22:04:480
2869824711,21sleep028695-21ntpq19:05:430
121192473,37sleep012116-21ntp_states19:31:180
65662460,2chrt6570-21timerandwakeup22:42:210
179122460,3chrt17911-21/usr/sbin/munin19:41:210
41142450,3sleep04115-21chrt20:10:160
230152452,32sleep022963-21apt-get20:40:200
3069590436,11cyclictest16752-21apt-get20:30:140
3069590425,11cyclictest14695-21ntpq20:25:550
3069590425,10cyclictest888-21ntpq20:55:560
169382420,2sleep016937-21wc19:40:050
30695904016,16cyclictest412-21snmpd19:27:130
30695904013,19cyclictest10130-21apt-get20:20:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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