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2026-06-19 - 05:48

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 Fri Jun 19, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2996421230,2chrt29963-21seq00:11:100
950921200,2chrt9510-21/usr/sbin/munin21:15:370
2379521190,2chrt23798-21latency_hist19:55:030
452321150,3chrt4525-21latency_hist22:45:060
2650321150,1sleep026556-21cut21:40:500
1141321150,2chrt11416-21apt22:55:010
2638221140,2chrt26380-21ld23:16:310
608021130,3chrt6081-21chrt21:58:190
2619121130,2chrt26193-21seq20:50:410
2886921120,2sleep028871-21proc_pri22:32:160
1545621120,2chrt15455-21sshd20:33:100
2842521100,3chrt28426-21chrt00:08:450
1259021090,2chrt12591-21seq22:07:580
1151521080,2chrt11516-21chrt19:35:170
589021070,2sleep05892-21seq23:35:120
1763721070,4chrt17638-21ld21:27:000
1640921050,3chrt16410-21grep23:50:510
1763721040,2chrt17638-21latency_hist19:45:030
44621030,2sleep0447-21seq22:38:270
11262960,1sleep01128-21fschecks_count21:51:250
245332840,2sleep024535-21sort00:02:270
131472840,2sleep013145-21aten2.4_rfpower21:20:530
121052830,1sleep012101-21grep22:55:500
256212820,2sleep025620-21/usr/sbin/munin22:27:270
288672790,2sleep028869-21sed20:55:080
168062790,1sleep016807-21chrt22:15:030
99912760,2sleep09994-21wc19:31:280
264342767,16sleep026435-21ntp_states19:05:540
85832750,2sleep08585-21ntp_offset22:01:580
55012750,2sleep05499-21diskstats22:46:170
324672740,2sleep032465-21sh21:50:000
57832730,2sleep05784-21seq00:22:570
2826890734,20cyclictest5659-21diskmemload21:13:150
2826890714,28cyclictest14694-21ntpq00:36:180
210492690,2sleep021050-21chrt23:57:190
2826890684,9cyclictest7081-21/usr/sbin/munin00:25:350
286082670,2sleep028610-21cut23:20:340
28268906719,11cyclictest18806-21/usr/sbin/munin23:05:380
191532670,1sleep019154-21mailstats19:46:230
37412660,2sleep03742-21rm23:31:160
259292660,2sleep025931-21cut21:40:060
166022660,2sleep016605-21sed23:02:030
28268906511,21cyclictest0-21swapper00:34:500
222442610,1sleep022245-21tune2fs23:10:500
7422590,1sleep0743-21gcc23:26:460
10852570,1sleep01082-21seq00:16:040
274542550,2sleep027456-21cut20:00:330
38712510,3chrt3867-21/usr/sbin/munin20:15:100
232942480,1sleep023292-21seq22:24:150
202972480,2sleep020292-21munin-run22:20:000
82992472,37sleep08309-21sleep20:21:150
176462474,34sleep017648-21ntpq20:36:220
37142460,2sleep03715-21switchtime19:21:260
28268904616,21cyclictest0-21swapper21:34:590
213692464,36sleep021373-21sleep20:42:180
28268904516,22cyclictest0-21swapper23:44:260
2826890424,19cyclictest6239-21memory19:25:470
28268904215,10cyclictest25011-21ntpq19:55:580
56962410,2sleep05697-21seq21:10:030
145972410,2sleep014598-21seq23:47:270
2826890406,26cyclictest412-21snmpd19:12:130
2826890405,9cyclictest31273-21ntpq20:06:010
2826890404,10cyclictest31817-21chrt19:15:270
28268904015,19cyclictest11221-21ntpq20:26:000
28268903914,17cyclictest892-21ntpq21:01:130
17772380,1sleep01778-21missed_timers20:10:490
2826890377,11cyclictest23578-21ntpq20:45:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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