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2026-09-03 - 01:35

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 all highest latencies:
System rackfslot4s.osadl.org (updated Wed Sep 02, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1598921240,3chrt15990-21/usr/sbin/munin11:05:500
1078921210,2sleep010794-21chrt10:57:580
722621190,2chrt7219-21ntpq07:31:210
499821170,2chrt4993-21ntpq12:26:140
2919021160,2sleep029189-21seq12:14:280
2072421160,2chrt20725-21seq10:24:250
2574121140,3chrt25744-21wc09:42:210
1777521140,3chrt17777-21latency_hist10:20:060
2622421120,2chrt26225-21seq10:32:110
2464321100,3chrt24644-21runrttasks12:07:070
675321090,4chrt6744-21awk09:15:000
2897121090,2chrt28972-21ssh11:25:240
954721080,3chrt9548-21runrttasks12:33:220
1365521080,2sleep013657-21sed12:40:080
2785321060,2chrt27854-21runrttasks11:23:010
1865221050,3chrt18653-21runrttasks07:50:280
901121020,3chrt9012-21sh09:17:290
874321020,2chrt8741-21diskstats08:26:240
365721010,2sleep03658-21chrt09:58:200
99492990,1sleep09950-21aten2.4_rfpower11:45:320
200782980,1sleep020079-21seq09:34:390
11612960,2sleep01162-21chrt10:43:290
50132940,2sleep05015-21sed11:37:200
107592830,3chrt10743-21df_inode09:20:450
70172810,2sleep07019-21chrt10:52:110
221752810,2sleep022176-21chrt12:03:320
102852810,2sleep010287-21chrt10:08:170
133282780,2sleep013329-21rm11:01:160
34042740,2sleep03405-21cat07:25:410
208032720,2sleep020806-21grep11:12:180
62162710,2sleep06215-21sh10:02:050
36842700,2sleep03687-21latency_hist12:25:040
295562670,2sleep029557-21seq09:48:290
66212640,2sleep06620-21basename11:40:330
284826310,44sleep02877-21basename11:35:010
224092600,1sleep022411-21sshd10:26:200
187552580,3sleep018750-21ssh11:58:200
317502550,1sleep031749-21seq12:17:380
5792542,6sleep0583-21runrttasks09:53:550
140542543,6sleep013957-21ssh11:51:070
34082530,2sleep03409-21seq10:46:390
204382523,39sleep020442-21sleep08:45:040
224932510,2sleep022494-21basename11:15:360
2396025013,20sleep023963-21ntpq07:05:560
228292503,40sleep022831-21irqstats07:56:380
174262500,1sleep017427-21chrt08:40:170
168112500,2sleep016812-21sh09:29:460
125502502,39sleep012551-21ntpq10:11:310
309592483,6sleep030968-21ntpq09:01:020
25776904819,22cyclictest0-21swapper10:39:410
25776904818,22cyclictest0-21swapper09:39:100
250582480,3chrt25056-21/usr/sbin/munin08:00:260
25776904714,25cyclictest0-21swapper08:50:400
303232443,35sleep030329-21ntpq07:16:180
2577690435,19cyclictest11510-21df_inode08:30:300
2577690435,10cyclictest32012-21ntpq08:10:540
2577690434,19cyclictest5996-21ntp_states08:21:110
269852423,31sleep026999-21ntpq07:10:550
2577690425,17cyclictest4564-21munin-run08:20:030
2577690424,11cyclictest10650-21users07:36:330
25776904216,19cyclictest0-21swapper07:48:510
25776904215,10cyclictest15860-21timerandwakeup08:36:310
2577690413,18cyclictest29109-21ld08:06:100
25776904015,9cyclictest27997-21ntp_states08:56:230
25776904015,19cyclictest13350-21ntpq07:41:090
25776903913,18cyclictest464-21apt-get09:05:110
2577690385,16cyclictest7315-21runrttasks07:21:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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