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2026-05-16 - 13:40

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 highest latencies:
System rackfslot4s.osadl.org (updated Sat May 16, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2162421250,2chrt21623-21/usr/sbin/munin23:05:340
2537621230,3chrt25375-21sleep23:10:570
1592721210,2chrt15928-21chrt23:45:320
1840321190,2chrt18390-21ntpq22:11:420
1142621180,3chrt11425-21/usr/sbin/munin19:30:270
521221170,2sleep05213-21/usr/sbin/munin00:17:220
3139321170,2chrt31394-21sleep20:54:050
2115321170,3chrt21154-21runrttasks21:27:230
359221150,2chrt3558-21apt-get21:50:150
3024721150,2chrt30241-21ntpq23:17:570
2742321130,2chrt27397-21ntpq21:36:470
726621120,4chrt7267-21chrt22:43:500
1901021120,2chrt19011-21seq21:24:530
2233921110,2chrt22337-21ls22:17:280
1411621110,2sleep014119-21runrttasks22:54:130
2656521100,3chrt26566-21chrt22:24:240
2109821100,2chrt21099-21fschecks_time19:45:350
1741421070,3chrt17415-21sleep22:59:050
2526821060,1sleep025269-21runrttasks21:33:530
181221060,2chrt1814-21fschecks_count22:35:520
1480021060,2chrt14801-21seq21:17:550
792621050,2chrt7927-21sleep21:07:310
2957321030,2sleep029576-21seq22:28:370
2493121010,2sleep024932-21chrt23:58:390
94622960,1sleep09463-21seq00:24:290
247272960,1sleep024728-21seq19:50:490
96452950,2sleep09647-21cut21:10:560
38752940,2sleep03877-21chrt20:10:230
288782930,2sleep028879-21chrt00:05:020
112352910,2sleep011236-21chrt20:21:120
8822890,1sleep0883-21chrt22:34:360
108112860,2sleep010813-21ps23:37:110
214362840,2sleep021437-21chrt23:53:120
86812720,2sleep08679-21idleruntime22:46:030
7002690,2sleep0701-21collect223:21:560
26982690,2sleep02699-21seq21:48:270
317872670,2sleep031788-21seq00:09:080
105842670,2sleep010586-21/usr/sbin/munin00:26:000
74962600,2sleep07495-21grep21:55:530
8632580,2sleep0864-21seq19:13:010
180462552,6sleep018050-21seq23:00:140
14672553,6sleep01472-21ssh00:11:560
323062542,7sleep032354-21fschecks_count20:55:360
86352520,2sleep08636-21runrttasks23:34:240
25002523,40sleep02451-21apt-get23:25:200
196942522,8sleep019491-21apt-get20:35:470
39302513,7sleep03937-21ntpq21:01:230
132382510,2sleep013237-21seq00:30:170
129862500,1sleep012987-21chrt22:03:590
49202490,2sleep04921-21runrttasks19:20:130
149502492,7sleep014946-21ssh23:43:350
29602483,6sleep02973-21ntpq19:16:080
147582480,1sleep014759-21seq20:26:350
139562482,39sleep013914-21ssh22:05:380
2918824713,20sleep029194-21ntpq19:05:580
323942443,34sleep032402-21ssh21:44:510
3099290446,10cyclictest17494-21ld20:31:200
3099290445,11cyclictest27194-21df_inode19:55:290
3099290426,27cyclictest17546-21/usr/sbin/munin19:41:230
3099290424,18cyclictest27198-21python320:46:240
3099290415,16cyclictest15777-21ntpq19:36:370
3099290405,28cyclictest19657-21modprobe00:40:000
30992904015,16cyclictest0-21swapper20:40:110
30992904014,8cyclictest1753-21ntpq20:05:590
30992903916,7cyclictest7263-21chrt20:15:350
30992903815,16cyclictest31085-21ntpq20:00:580
3099290375,11cyclictest9152-21ntpq19:26:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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