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2025-10-22 - 01:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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 50 highest latencies:
System rackeslot4s.osadl.org (updated Tue Oct 21, 2025 12:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2081294993935,3cyclictest2357057-21kworker/u8:0+flush-259:012:35:193
2081284993936,2cyclictest2138848-21fwupd08:04:560
2081284993833,3cyclictest2305230-21awk10:45:000
2081294993631,4cyclictest2066177-21kworker/u8:2+flush-259:007:35:203
2081294993330,2cyclictest2211185-21kworker/u8:3+flush-259:009:20:183
2081294993329,3cyclictest2284913-21kworker/u8:0+flush-259:011:15:003
2081294993326,5cyclictest2698871-21systemd-journal12:15:003
2081284993326,5cyclictest2160398-21diskstats08:25:150
2081289993229,2cyclictest2357057-21kworker/u8:0+events_unbound12:30:202
2081289993027,2cyclictest2284913-21kworker/u8:0+flush-259:011:10:172
2081286993024,4cyclictest2242793-21apt-get09:45:141
2081284993023,5cyclictest2371768-21ntpq11:45:220
2081294992923,4cyclictest2305231-21latency_hist10:45:003
2081289992927,1cyclictest3686920-21kworker/2:0+pm08:04:562
2081284992923,4cyclictest2300091-21latency_hist10:40:000
2081284992921,6cyclictest2698871-21systemd-journal07:15:000
2081294992821,5cyclictest2133726-21latency_hist08:00:013
2081284992824,3cyclictest2102639-21apt-get07:30:090
2081294992722,3cyclictest2185706-21kworker/u8:0+flush-259:009:15:153
2081289992723,3cyclictest2169992-21kworker/u8:3+events_unbound08:35:182
2081286992723,3cyclictest2211185-21kworker/u8:3+flush-259:009:25:011
2081284992720,5cyclictest2237346-21latency_hist09:40:000
2081284992718,7cyclictest2149687-21kworker/u8:1+flush-259:008:20:000
2081294992518,5cyclictest2698871-21systemd-journal08:19:593
2081289992522,2cyclictest2341740-21kworker/u8:3+events_unbound11:30:212
2081289992521,3cyclictest2378251-21kworker/u8:3+events_unbound12:30:012
2081286992520,3cyclictest2336269-21gpgv11:15:001
2081284992521,3cyclictest2112909-21kworker/u8:3+events_unbound07:50:180
2081284992520,3cyclictest2284913-21kworker/u8:0+events_unbound10:55:170
2081284992520,3cyclictest2221876-21kworker/u8:4+flush-259:010:05:180
2081284992519,4cyclictest2248141-21diskstats09:50:130
2081294992420,3cyclictest2185706-21kworker/u8:0+flush-259:008:55:003
2081294992420,3cyclictest2185706-21kworker/u8:0+flush-259:008:54:593
2081289992421,2cyclictest2107539-21kworker/u8:1+flush-259:007:45:212
2081286992419,4cyclictest2153985-21ntpq08:15:241
2081286992419,3cyclictest2144083-21latency_hist08:10:011
2081286992417,5cyclictest2325828-21latency_hist11:05:001
2081284992419,4cyclictest2347100-21/usr/sbin/munin11:25:240
2081284992418,4cyclictest2698871-21systemd-journal09:17:450
2081284992418,4cyclictest2352468-21diskstats11:30:160
2081294992318,3cyclictest2342142-21diskstats11:20:143
2081294992317,4cyclictest2362531-21/usr/sbin/munin11:40:143
2081289992319,3cyclictest2185706-21kworker/u8:0+flush-259:009:45:192
2081289992317,4cyclictest2258016-21latency_hist10:00:012
2081294992219,2cyclictest2221876-21kworker/u8:4+flush-259:009:35:013
2081289992219,2cyclictest2169992-21kworker/u8:3+flush-259:008:35:002
2081289992219,2cyclictest2160015-21kworker/u8:2+flush-259:009:15:012
2081289992216,4cyclictest2185676-21awk08:50:002
2081286992219,2cyclictest2294555-21kworker/u8:2+flush-259:010:34:591
2081286992219,2cyclictest2263420-21kworker/u8:1+flush-259:011:30:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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