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2026-05-16 - 00:20

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 May 15, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2051021310,2sleep020511-21seq10:24:430
900821290,2sleep09009-21rm11:44:170
367721220,2sleep03678-21seq12:25:200
1772621220,2chrt17720-21ntpq11:56:580
3173921210,2chrt31738-21grep10:41:270
2193121180,3chrt21932-21runrttasks09:37:590
1409521170,2chrt14064-21ssh11:51:240
336421160,3chrt3363-21sshd10:46:520
2600721160,2sleep026008-21runrttasks09:44:400
2275921150,2chrt22760-21/usr/sbin/munin10:27:190
655321140,3chrt6549-21telnet09:15:350
605921140,3chrt6060-21ls11:40:030
115621140,2chrt1153-21ld11:32:000
3249321130,1sleep032494-21runrttasks09:54:120
1676821120,2chrt16767-21seq08:40:190
1051521120,1sleep010514-21seq07:38:010
3198321090,3chrt31984-21runrttasks07:20:360
2575421090,2chrt25755-21fschecks_count11:20:510
3032421080,1sleep030325-21chrt09:01:040
451621070,1sleep04515-21seq09:11:590
1947321030,4chrt19471-21/usr/sbin/munin12:00:110
1250421020,2chrt12505-21chrt12:37:590
2475421010,3chrt24755-21sh08:51:590
1872721010,2sleep018728-21rm09:33:180
295492970,1sleep029550-21/usr/sbin/munin12:15:310
244632970,2sleep024465-21seq11:18:450
82172940,1sleep08218-21gcc12:31:250
87032830,2sleep08706-21sed10:06:490
61032830,1sleep06105-21cut10:51:050
289122830,2sleep028911-21seq11:25:380
114962830,2sleep011497-21chrt10:10:540
102002820,2sleep010198-21if_can011:45:590
273342800,1sleep027336-21wc10:35:040
114472800,2sleep011448-21chrt07:40:100
245272780,2sleep024528-21chrt12:07:120
35962770,2sleep03597-21chrt09:59:240
110542750,2sleep011055-21chrt10:58:480
156682740,1sleep015669-21runrttasks07:45:590
278232670,2sleep027825-21chrt08:05:440
55292650,1sleep05530-21awk07:30:280
49552603,9sleep04957-21irqstats08:20:460
294852604,8sleep029510-21apt09:50:000
296042584,8sleep029610-21ntpq07:16:140
192222584,7sleep019244-21cat11:10:590
152302580,1sleep015231-21seq09:27:550
286082574,10sleep028606-21memory10:36:140
187512575,9sleep018753-21ntpq07:50:580
80562564,10sleep08062-21irqstats08:25:470
50692540,2sleep05071-21latency_hist07:30:020
18322522,7sleep01834-21sshd12:21:510
178282513,8sleep017832-21chrt11:08:430
26592504,38sleep02664-21sshd09:09:530
255182500,1sleep025519-21runrttasks08:01:300
304462490,2sleep030505-21/usr/sbin/munin08:10:330
25093904818,23cyclictest0-21swapper09:20:110
2306424813,20sleep023074-21ntpq07:05:390
131742470,2sleep013176-21cut11:01:500
56992460,1sleep05698-21seq10:02:020
25093904517,21cyclictest0-21swapper10:18:230
18332450,2chrt1831-21/usr/sbin/munin08:16:320
270692440,2chrt27071-21irqrtprio12:11:060
25093904417,10cyclictest21435-21/usr/sbin/munin08:46:310
256292430,3chrt25628-21grep07:10:340
25093904214,21cyclictest0-21swapper08:31:270
2509390414,9cyclictest27163-21ntpq08:56:010
2509390394,10cyclictest14244-21df_inode08:36:210
25093903920,12cyclictest0-21swapper07:55:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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