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2025-08-21 - 16:17

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 Thu Aug 21, 2025 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2206322150,3chrt22060-21python307:06:010
433121210,2chrt4323-21df11:35:380
2999221210,3chrt29990-21memory08:25:500
1862721210,2sleep018628-21cut08:05:030
609621190,3chrt6095-21/usr/sbin/munin07:40:140
2043321170,3chrt20434-21fschecks_count09:11:270
408621140,3chrt4087-21sleep10:37:020
116321120,2sleep01166-21ntp_kernel_pll_10:31:340
1052921110,2sleep010527-21ntp_kernel_pll_08:51:000
2649121100,2chrt26490-21ssh09:21:190
1896721090,2chrt18966-21ssh11:03:530
2981221080,2sleep029814-21irqrtprio12:21:050
106312920,2sleep010630-21cut09:51:450
99392900,2sleep09942-21cut07:46:250
53032850,3chrt5279-21ntpq09:41:270
294562850,2sleep029457-21readlink10:25:080
236682850,2chrt23661-21diskstats07:10:320
198862810,2sleep019888-21ld08:06:230
272912800,1sleep027290-21sed08:20:430
247432720,2sleep024744-21cat10:16:430
232022690,2sleep023200-21if_can009:16:020
227312680,2sleep022732-21cat08:11:280
69042670,2sleep06905-21aten2.4_rfpower11:40:320
257392670,2sleep025740-21sh11:15:540
290212660,2sleep029023-21irqrtprio09:26:050
26912565,42sleep02694-21ntp_states09:36:540
22632550,2sleep02267-21irqrtprio11:31:470
183322553,42sleep018387-21tune2fs12:01:000
204302543,9sleep020426-21irqstats11:06:090
154652543,43sleep015497-21sed09:00:490
26192523,7sleep02621-21sleep07:31:550
233602520,2sleep023377-21grep11:11:450
23222905019,23cyclictest0-21swapper10:08:590
212012500,3chrt21202-21sh10:10:350
124682503,7sleep012449-21ssh10:51:450
320522490,2chrt32034-21ntpq11:26:470
23222904919,23cyclictest0-21swapper10:48:240
23222904918,24cyclictest0-21swapper09:34:550
23222904918,22cyclictest0-21swapper12:34:070
23222904817,24cyclictest0-21swapper11:24:560
135842483,37sleep013589-21gcc11:51:460
23222904716,22cyclictest0-21swapper11:49:530
158072470,2chrt15809-21irqrtprio11:56:010
57982460,2sleep05802-21sed12:36:030
160612464,34sleep016037-21munin-run08:00:030
23222904517,10cyclictest6058-21diskstats10:40:480
23222904415,22cyclictest0-21swapper12:19:370
23222904413,22cyclictest0-21swapper09:58:080
21252443,32sleep01899-21apt-get08:36:110
2322290436,9cyclictest4733-21ntpq07:36:200
2322290435,29cyclictest23735-21df_inode12:10:410
2322290435,11cyclictest9561-21munin-run09:50:040
2322290434,10cyclictest18060-21ssh10:05:050
2322290426,18cyclictest21143-21ssh12:05:540
2322290425,9cyclictest5408-21ntpq08:40:520
23222904220,15cyclictest0-21swapper08:30:260
23222904216,19cyclictest32241-21munin-run10:30:030
189552421,4sleep00-21swapper09:08:020
23222904117,16cyclictest12311-21runrttasks08:55:280
23222904115,18cyclictest7493-21if_err_can008:45:410
2322290405,9cyclictest23620-21apt-get08:15:200
2322290405,9cyclictest14647-21chrt10:56:020
23222904019,14cyclictest0-21swapper12:29:350
2322290394,16cyclictest26986-21ntpq07:16:080
2322290386,12cyclictest12120-21sshd07:50:550
23222903814,17cyclictest32449-21users07:26:310
23222903614,16cyclictest29287-21latency07:20:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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