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How many new lines of code does an average Linux kernel developer produce per year? in c/programming@programming.dev
[–] 4 points 6 days ago (1 child)

  1. You are mixing up the units here. Value is not a real money, and you can't pay salaries with value. You can pay salaries with cash.

  2. To actually get how many LOC in a kernel per person per year they produce. You need to look at git history, and do data science on it. It's doable and easy but not really my area of expertise.

  3. You need to account for that vast majority of contributors make just one patch and they are never heard from again. They don't work full time, or even part time on the kernel.

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    Canvas Stats has been updated for 2026 in c/canvas@toast.ooo
    Anyone know what this is? in c/programming@programming.dev
    Anyone know what this is? in c/programming@programming.dev
    [–] 39 points 1 week ago* (last edited 1 week ago) (2 children)

    At first glance there is a lot of noise that look like an ARG but there is just too much random stuff. There are some binary blobs that are marked as executable. They might be malware.

    Edit:

    Found blender screenshots, firefox screenshots with some firefox extension config files, SVGs and PNGs, links to alternative 4chans, solidworks tutorials and blender VK groups

    They are crazy for using VERY heavily riced windows that is ultra-minimalist white.

    Russian hacker for sure. Might or might not have developed malware. I am more inclined for this to be a cloud backup hosted on github.

    Edit2: The Filepath is crazy

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    How would you design online communities so they don't degenerate over time? in c/programming@programming.dev
    [–] 1 point 1 week ago

    If you have time you could implement an experiment in piefed or lemmy to test how it feels.

    Would this actually prevent the decay, or just slow it down?
    Is there a simpler/better mechanism I’m missing?

    I guess there are sociology books written about it, but I don't know any.

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    [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [–] [S] 1 point 1 week ago* (last edited 1 week ago)

    I have ruled out the RAM issue by running as simplified test as possible: spotify + stress-ng and easy effects not running

    free -h
               total        used        free      shared  buff/cache   available
Mem:            13Gi       7,8Gi       851Mi       166Mi       5,9Gi       5,7Gi
Swap:           35Gi       2,3Gi        33Gi

    iostat
Linux 7.1.3-ogc3.4.fc44.x86_64 (bazzite)        17.07.2026      _x86_64_        (12 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          10,04    0,01    2,64    0,11    0,00   87,20

Device             tps    kB_read/s    kB_wrtn/s    kB_dscd/s    kB_read    kB_wrtn    kB_dscd
nvme0n1           0,03         0,67         0,00         0,00      11939          0          0
nvme1n1         108,97      1720,07      2211,60      2309,40   30620304   39370413   41111372
zram0           145,99       105,04       478,97         0,00    1869980    8526568          0

    I have started to dig more into the perf, trace-cmd and cyclictest and finally managed to run all of the in the same time to capture the same high delay event. If the arch forum is correct then pipewire uses data-loop.0 process for realtime processing. It got SCHED_RR, so it seems correct as according to man pages it would preempt the SCHED_OTHER that stress-ng runs in.

    Interesting thing I (and a council of clankers) noticed in trace_cpu_4.txt is that the interrupt didn't fire at specified time, and when it did, scheduler immediately preempted stress-ng to run the cyclictest as it's SHED_FIFO.

    My current theory is some sort interrupt problem

    trace-cmd report > trace.txt sed -n '2682652,2684299p' trace.txt > trace_extract.txt cat trace_extract.txt | grep -i "\[004\]" > trace_cpu_4.txt

    logs:

    ps -eo pid,class,rtprio,ni,pri,comm -L | grep -i 'rr\|ff\|dln'
     19 FF      99   - 139 migration/0
     21 FF      50   -  90 idle_inject/0
     24 FF      50   -  90 idle_inject/2
     25 FF      99   - 139 migration/2
     30 FF      50   -  90 idle_inject/4
     31 FF      99   - 139 migration/4
     36 FF      50   -  90 idle_inject/6
     37 FF      99   - 139 migration/6
     42 FF      50   -  90 idle_inject/8
     43 FF      99   - 139 migration/8
     48 FF      50   -  90 idle_inject/10
     49 FF      99   - 139 migration/10
     54 FF      50   -  90 idle_inject/1
     55 FF      99   - 139 migration/1
     60 FF      50   -  90 idle_inject/3
     61 FF      99   - 139 migration/3
     66 FF      50   -  90 idle_inject/5
     67 FF      99   - 139 migration/5
     72 FF      50   -  90 idle_inject/7
     73 FF      99   - 139 migration/7
     78 FF      50   -  90 idle_inject/9
     79 FF      99   - 139 migration/9
     84 FF      50   -  90 idle_inject/11
     85 FF      99   - 139 migration/11
    104 FF      50   -  90 irq/9-acpi
    108 TS       - -20  39 kworker/R-ata_sff
    112 FF      50   -  90 watchdogd
    115 FF      50   -  90 irq/25-AMD-Vi0-Evt
    116 FF      50   -  90 irq/26-AMD-Vi0-PPR
    117 FF      50   -  90 irq/27-AMD-Vi0-GA
    428 TS       - -20  39 kworker/R-amdgpu_dm_hpd_rx_offload_wq
    430 FF      50   -  90 card1-crtc0
    431 FF      50   -  90 card1-crtc1
    432 FF      50   -  90 card1-crtc2
    433 FF      50   -  90 card1-crtc3
    461 TS       -   0  19 nvidia-modeset/deferred_close_kthread_q
    462 FF      50   -  90 irq/62-nvidia
    475 TS       -   0  19 UVM deferred release queue
    624 FF      50   -  90 irq/63-ELAN06FA:00
    770 FF       1   -  41 psimon
    842 FF       1   -  41 psimon
   1255 FF      50   -  90 irq/96-rtw89_pci
   1513 RR      99   - 139 rtkit-daemon
   1589 FF       1   -  41 psimon
   3098 RR       1   -  41 kwin_wayland
   3098 RR       1   -  41 eDP-1
   3098 RR       1   -  41 libinput-connec
   3114 RR      20   -  60 data-loop.0
   3115 RR      20   -  60 data-loop.0
   3316 RR      20   -  60 data-loop.0
   3316 RR      20   -  60 data-loop.0
   3316 TS       -   0  19 bazaarrunner
   3316 TS       -   0  19 krunner_charrun
   3327 RR      20   -  60 data-loop.0
   6596 TS       -   0  19 WRRende~ckend#1
   6596 TS       -   0  19 WRRende~kend#19
  37282 FF       1   -  41 psimon
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest
  37326 FF      80   - 120 cyclictest

    sudo cyclictest --mlockall --smp --priority=80 --interval=200 --breaktrace=800
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 11.16 5.94 3.72 19/2368 37630

T: 0 (37327) P:80 I:200 C: 268947 Min:      8 Act:   13 Avg:   13 Max:     462
T: 1 (37329) P:80 I:700 C:  76837 Min:      8 Act:   15 Avg:   13 Max:      78
T: 2 (37330) P:80 I:1200 C:  44819 Min:      9 Act:   15 Avg:   14 Max:      49
T: 3 (37331) P:80 I:1700 C:  31635 Min:      8 Act:   14 Avg:   14 Max:     153
T: 4 (37332) P:80 I:2200 C:  24443 Min:      9 Act:   15 Avg:   14 Max:     106
T: 5 (37333) P:80 I:2700 C:  19915 Min:      9 Act:   14 Avg:   14 Max:     132
T: 6 (37334) P:80 I:3200 C:  16802 Min:      9 Act:   19 Avg:   14 Max:     766
T: 7 (37335) P:80 I:3700 C:  14531 Min:      9 Act:   15 Avg:   14 Max:     179
T: 8 (37336) P:80 I:4200 C:  12800 Min:      8 Act:   21 Avg:   13 Max:      37
T: 9 (37337) P:80 I:4700 C:  11437 Min:      9 Act:   19 Avg:   14 Max:     264
T:10 (37338) P:80 I:5200 C:  10337 Min:      9 Act:   17 Avg:   14 Max:      73
T:11 (37339) P:80 I:5700 C:   9430 Min:      9 Act:   18 Avg:   14 Max:      83
# Thread Ids: 37327 37329 37330 37331 37332 37333 37334 37335 37336 37337 37338 37339
# Break thread: 37332
# Break value: 2488

    sudo perf sched timehist > perf_timehist.txt awk '$1 >= 9980.792239 && $1 <= 9980.797096' perf_timehist.txt > perf_extract.txt https://pastebin.com/iuB98bXg

    sudo perf sched latency > perf_latency.txt https://pastebin.com/JP0PfrSU

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    • [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [–] [S] 1 point 1 week ago* (last edited 1 week ago)

    After digging a bit it looks like pipewire and spotify don't get realtime shedules only SCHED_OTHER and SCHED_BATCH https://bbs.archlinux.org/viewtopic.php?pid=2279287#p2279287

       4873 TS       -   0  19 WRRende~kend#18
ludrol@bazzite:/var/home/ludrol/tmp$ ps -eo pid,class,rtprio,ni,pri,comm -L | grep -i spotify
   8613 TS       -   0  19 spotify
   8613 TS       -   0  19 spotify
   8613 TS       -   0  19 spotify
   8620 TS       -   0  19 spotify
   8620 TS       -   0  19 spotify
   8620 TS       -   0  19 spotify
   8624 TS       -   0  19 spotify
   8625 TS       -   0  19 spotify
   8664 TS       -   0  19 spotify
   8664 TS       -   0  19 spotify:cs0
   8664 B        0  19   0 spotify:disk$0
   8664 TS       -   0  19 spotify:sh0
   8664 TS       -   0  19 spotify:gdrv0
   8664 TS       -   0  19 spotify:gl0
   8664 TS       -   0  19 spotify:sh1
   8664 TS       -   0  19 spotify:sh2
   8664 TS       -   0  19 spotify:sh3
   8664 TS       -   0  19 spotify:sh4
   8664 TS       -   0  19 spotify:sh5
   8664 TS       -   0  19 spotify:sh6
   8664 TS       -   0  19 spotify:sh7
   8664 TS       -   0  19 spotify:sh8
   8664 B        0  19   0 spotify:disk$1
   8664 B        0  19   0 spotify:disk$2
   8664 B        0  19   0 spotify:disk$3
   8664 B        0  19   0 spotify:disk$0
   8664 TS       -   0  19 spotify:sh0
   8665 TS       -   0  19 spotify
   8669 TS       -   0  19 spotify
   8730 TS       -   0  19 spotify
   8804 TS       -   0  19 spotify
   8860 TS       -   0  19 spotify
ludrol@bazzite:/var/home/ludrol/tmp$ ps -eo pid,class,rtprio,ni,pri,comm -L | grep -i pipe
   2080 TS       -   0  19 IpcPipeBroadcas
   2080 TS       -   0  19 IpcPipeBroadcas
   2080 TS       -   0  19 IpcPipeBroadcas
   2080 TS       -   0  19 IpcPipeBroadcas
   3090 TS       - -11  30 pipewire
   3296 TS       - -11  30 pipewire-pulse
   3822 TS       -   0  19 .NET EventPipe
   3822 TS       -   0  19 .NET DebugPipe
   8613 TS       -   0  19 pipewire-loop
  40140 TS       -   0  19 mpv/ao/pipewire

    systemctl status rtkit-daemon
● rtkit-daemon.service - RealtimeKit Scheduling Policy Service
     Loaded: loaded (/usr/lib/systemd/system/rtkit-daemon.service; enabled; preset: enabled)
    Drop-In: /usr/lib/systemd/system/service.d
             └─10-timeout-abort.conf
     Active: active (running) since Thu 2026-07-16 08:42:27 CEST; 3h 3min ago
 Invocation: 71422e850ec74c97b6edfa1666d3243a
   Main PID: 1599 (rtkit-daemon)
      Tasks: 3 (limit: 16290)
     Memory: 580K (peak: 3.5M, swap: 12K, swap peak: 12K)
        CPU: 92ms
     CGroup: /system.slice/rtkit-daemon.service
             └─1599 /usr/libexec/rtkit-daemon

lip 16 08:42:38 bazzite rtkit-daemon[1599]: Successfully made thread 3090 of process 3090 (/usr/bin/pipewire) owned by '1000' high priority at nice level -11.
lip 16 08:42:38 bazzite rtkit-daemon[1599]: Successfully made thread 3095 of process 3090 (/usr/bin/pipewire) owned by '1000' RT at priority 20.
lip 16 08:42:38 bazzite rtkit-daemon[1599]: Successfully made thread 3091 of process 3091 (/usr/bin/wireplumber) owned by '1000' high priority at nice level -11.
lip 16 08:42:38 bazzite rtkit-daemon[1599]: Successfully made thread 3103 of process 3091 (/usr/bin/wireplumber) owned by '1000' RT at priority 20.
lip 16 08:42:39 bazzite rtkit-daemon[1599]: Successfully made thread 3296 of process 3296 (/usr/bin/pipewire) owned by '1000' high priority at nice level -11.
lip 16 08:42:39 bazzite rtkit-daemon[1599]: Successfully made thread 3300 of process 3296 (/usr/bin/pipewire) owned by '1000' RT at priority 20.
lip 16 08:42:41 bazzite rtkit-daemon[1599]: Successfully made thread 3837 of process 3287 (/usr/bin/plasmashell) owned by '1000' RT at priority 20.
lip 16 08:42:42 bazzite rtkit-daemon[1599]: Successfully made thread 4081 of process 3287 (/usr/bin/plasmashell) owned by '1000' RT at priority 20.
lip 16 08:42:43 bazzite rtkit-daemon[1599]: Successfully made thread 4331 of process 4070 (/var/home/ludrol/.local/share/Steam/ubuntu12_32/steam) owned by '1000' high priority at nice level -10.
lip 16 08:42:44 bazzite rtkit-daemon[1599]: Successfully made thread 4332 of process 4070 (/var/home/ludrol/.local/share/Steam/ubuntu12_32/steam) owned by '1000' high priority at nice level -10.
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    • [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [–] [S] 1 point 1 week ago* (3 children)

    I tried to force a clanker to help me, but it can only get me so far.

    I have run sudo perf sched record -- sleep 5 with spotify and stress-ng and without easy effects but it didn't really tell about what was blocking the thread, or what could be the problem.

     -------------------------------------------------------------------------------------------------------------------------------------------
  Task                  |   Runtime ms  |  Count   | Avg delay ms    | Max delay ms    | Max delay start           | Max delay end          |
 -------------------------------------------------------------------------------------------------------------------------------------------
  TaskCon~ller #4:(2)   |      0.083 ms |        3 | avg:   8.605 ms | max:  22.177 ms | max start:  2225.534477 s | max end:  2225.556654 s
  dex-thread-pool:(3)   |      6.973 ms |        7 | avg:   8.459 ms | max:  22.054 ms | max start:  2227.176387 s | max end:  2227.198441 s
  spotify:(5)           |    390.149 ms |      855 | avg:   8.354 ms | max: 198.827 ms | max start:  2227.285930 s | max end:  2227.484757 s
  WRScene~derLP#1:5028  |      2.360 ms |      194 | avg:   7.097 ms | max:  76.383 ms | max start:  2226.890377 s | max end:  2226.966759 s
  ThreadPoolServi:8864  |      0.101 ms |        3 | avg:   6.935 ms | max:  20.742 ms | max start:  2226.356434 s | max end:  2226.377175 s
  Media:8854            |     53.526 ms |      394 | avg:   6.881 ms | max: 107.856 ms | max start:  2226.212405 s | max end:  2226.320261 s
  VizCompositorTh:8780  |     77.461 ms |      562 | avg:   6.859 ms | max:  83.443 ms | max start:  2227.253999 s | max end:  2227.337441 s
  Core Thread:8688      |      7.656 ms |      105 | avg:   6.800 ms | max:  77.954 ms | max start:  2229.299488 s | max end:  2229.377442 s
  Connect Discove:8725  |      0.286 ms |        8 | avg:   6.768 ms | max:  16.469 ms | max start:  2227.202786 s | max end:  2227.219255 s
  Network Thread:8708   |      6.427 ms |       76 | avg:   6.677 ms | max:  40.636 ms | max start:  2229.901403 s | max end:  2229.942039 s
  WRScene~ilder#1:5027  |      3.435 ms |      211 | avg:   6.582 ms | max:  79.265 ms | max start:  2226.887473 s | max end:  2226.966738 s
  File Streamer I:8711  |      9.539 ms |      100 | avg:   5.854 ms | max:  44.024 ms | max start:  2227.061508 s | max end:  2227.105532 s
  ThreadPoolForeg:(6)   |      5.587 ms |       59 | avg:   5.745 ms | max:  32.582 ms | max start:  2225.737484 s | max end:  2225.770066 s
  KIO::WorkerThre:(2)   |      1.832 ms |       22 | avg:   5.452 ms | max:  20.065 ms | max start:  2229.568516 s | max end:  2229.588581 s
  Desktop EventSe:8689  |      0.595 ms |        1 | avg:   5.057 ms | max:   5.057 ms | max start:  2225.703380 s | max end:  2225.708437 s
  spotify:cs0:8750      |     15.509 ms |      245 | avg:   5.056 ms | max:  51.215 ms | max start:  2227.051346 s | max end:  2227.102561 s
  VideoFrameCompo:8855  |     29.563 ms |      337 | avg:   4.979 ms | max:  47.150 ms | max start:  2227.483466 s | max end:  2227.530616 s
  WRRende~ckend#1:5029  |     18.610 ms |      336 | avg:   4.894 ms | max:  69.204 ms | max start:  2227.019314 s | max end:  2227.088517 s
  Chrome_IOThread:(2)   |      9.801 ms |      132 | avg:   4.686 ms | max:  35.030 ms | max start:  2229.786608 s | max end:  2229.821638 s
  glean.dispatche:4896  |      7.905 ms |      379 | avg:   4.599 ms | max:  71.021 ms | max start:  2226.969815 s | max end:  2227.040835 s
  WebExtensions:5078    |     83.091 ms |      254 | avg:   3.902 ms | max:  43.411 ms | max start:  2227.657268 s | max end:  2227.700679 s
  Chrome_ChildIOT:(5)   |     38.349 ms |      940 | avg:   3.864 ms | max:  57.356 ms | max start:  2225.249786 s | max end:  2225.307142 s
  ThreadPoolSingl:(2)   |     37.049 ms |      570 | avg:   3.811 ms | max:  58.063 ms | max start:  2227.475541 s | max end:  2227.533604 s
  TaskCon~ller #1:(2)   |      5.080 ms |       83 | avg:   3.688 ms | max:  34.766 ms | max start:  2227.041677 s | max end:  2227.076443 s
  TaskCon~ller #0:(4)   |     17.486 ms |      162 | avg:   3.036 ms | max:  39.163 ms | max start:  2227.452333 s | max end:  2227.491496 s
  Audio Driver Th:8718  |     15.663 ms |      513 | avg:   2.887 ms | max:  48.186 ms | max start:  2227.368253 s | max end:  2227.416439 s
  firefox:cs0:4943      |      4.029 ms |       56 | avg:   2.884 ms | max:   9.819 ms | max start:  2228.624509 s | max end:  2228.634328 s
  Renderer:4966         |     16.666 ms |      133 | avg:   2.751 ms | max:  36.844 ms | max start:  2227.794477 s | max end:  2227.831321 s
  bazaar:8465           |      0.190 ms |        3 | avg:   2.720 ms | max:   8.111 ms | max start:  2227.223328 s | max end:  2227.231439 s
  IPC I/O Parent:4898   |      5.250 ms |      206 | avg:   2.573 ms | max:  22.691 ms | max start:  2227.468762 s | max end:  2227.491453 s
  Media Mixer Ren:8882  |     39.110 ms |      478 | avg:   2.484 ms | max:  39.760 ms | max start:  2229.637725 s | max end:  2229.677485 s
  mpris-proxy:2576      |      0.648 ms |        5 | avg:   2.477 ms | max:   5.067 ms | max start:  2226.065870 s | max end:  2226.070938 s
  JS Watchdog:(5)       |      0.480 ms |       21 | avg:   2.434 ms | max:  23.796 ms | max start:  2226.863646 s | max end:  2226.887442 s
  SteamUIWatchdog:4443  |      0.025 ms |        1 | avg:   2.391 ms | max:   2.391 ms | max start:  2229.533194 s | max end:  2229.535585 s
  DOM Worker:15552      |      4.313 ms |       28 | avg:   2.111 ms | max:   8.721 ms | max start:  2225.547973 s | max end:  2225.556694 s
  Compositor:(2)        |    125.776 ms |     2106 | avg:   2.076 ms | max: 119.343 ms | max start:  2229.776914 s | max end:  2229.896257 s
  Timer:(10)            |      8.823 ms |      416 | avg:   2.054 ms | max:  42.432 ms | max start:  2226.970019 s | max end:  2227.012451 s
  dolphin:9296          |     31.250 ms |      117 | avg:   1.963 ms | max:  21.491 ms | max start:  2228.605754 s | max end:  2228.627245 s
  TaskCon~ller #3:(2)   |      1.196 ms |       35 | avg:   1.848 ms | max:  22.169 ms | max start:  2225.534467 s | max end:  2225.556635 s
  TaskCon~ller #2:(2)   |      3.287 ms |       50 | avg:   1.644 ms | max:  22.594 ms | max start:  2225.534012 s | max end:  2225.556605 s
  pipewire-loop:8884    |     20.933 ms |      511 | avg:   1.583 ms | max:  42.681 ms | max start:  2227.302468 s | max end:  2227.345149 s

[…]

  pipewire-pulse:3296   |     19.050 ms |      727 | avg:   0.123 ms | max:   0.994 ms | max start:  2229.906447 s | max end:  2229.907441 s

    https://pastebin.com/nZnGf2fP

    clanker has seen cyclictest and sudo trace-cmd record -e sched -e irq -e timer -e workqueue -e power -e signal so I tried running that

    sudo cyclictest --mlockall --smp --priority=80 --interval=200 --breaktrace=1000
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 8.00 2.89 2.49 24/1847 16763          

T: 0 (16700) P:80 I:200 C: 144467 Min:      6 Act:   13 Avg:   11 Max:     376
T: 1 (16701) P:80 I:700 C:  41270 Min:      7 Act:   15 Avg:   11 Max:      98
T: 2 (16702) P:80 I:1200 C:  24071 Min:      7 Act:   12 Avg:   12 Max:     130
T: 3 (16703) P:80 I:1700 C:  16989 Min:      8 Act:   15 Avg:   12 Max:     107
T: 4 (16704) P:80 I:2200 C:  13126 Min:      7 Act:   19 Avg:   12 Max:     104
T: 5 (16705) P:80 I:2700 C:  10694 Min:      8 Act:   20 Avg:   12 Max:      58
T: 6 (16706) P:80 I:3200 C:   9022 Min:      8 Act:   16 Avg:   13 Max:      56
T: 7 (16707) P:80 I:3700 C:   7802 Min:      8 Act:   12 Avg:   13 Max:     101
T: 8 (16708) P:80 I:4200 C:   6872 Min:      8 Act:   10 Avg:   12 Max:      27
T: 9 (16709) P:80 I:4700 C:   6140 Min:      9 Act:   12 Avg:   13 Max:      47
T:10 (16710) P:80 I:5200 C:   5549 Min:      9 Act:   15 Avg:   13 Max:      83
T:11 (16711) P:80 I:5700 C:   5061 Min:      9 Act:   14 Avg:   14 Max:      31
# Thread Ids: 16700 16701 16702 16703 16704 16705 16706 16707 16708 16709 16710 16711
# Break thread: 16705
# Break value: 3337

    I have extracted the scheduler events between ~8ms delay of 16705 thread, but I don't know how to tackle it.

    https://pastebin.com/D4bbzqT7

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    • [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [–] [S] 1 point 1 week ago*

    I have read through the article and I am 99% sure it's schedule issue

    after dozens of seconds without load I get this output:

    sudo cyclictest --mlockall --smp --priority=80 --interval=200 --distance=0             
# /dev/cpu_dma_latency set to 0us
policy: fifo: loadavg: 4.86 7.85 6.59 6/2385 19280             

T: 0 (17848) P:80 I:200 C:2016327 Min:      3 Act:   29 Avg:   16 Max:    3939
T: 1 (17849) P:80 I:200 C:2016322 Min:      3 Act:   25 Avg:   15 Max:    3910
T: 2 (17850) P:80 I:200 C:2015361 Min:      4 Act:   32 Avg:   16 Max:    4195
T: 3 (17851) P:80 I:200 C:2016059 Min:      4 Act:   26 Avg:   16 Max:    4057
T: 4 (17852) P:80 I:200 C:2016323 Min:      3 Act:   31 Avg:   15 Max:     495
T: 5 (17853) P:80 I:200 C:2016278 Min:      4 Act:   23 Avg:   16 Max:    4686
T: 6 (17854) P:80 I:200 C:2016153 Min:      4 Act:   23 Avg:   16 Max:    4259
T: 7 (17855) P:80 I:200 C:2016166 Min:      4 Act:   28 Avg:   18 Max:    3922
T: 8 (17856) P:80 I:200 C:2015946 Min:      4 Act:   28 Avg:   16 Max:    3724
T: 9 (17857) P:80 I:200 C:2015942 Min:      3 Act:   40 Avg:   16 Max:    4621
T:10 (17858) P:80 I:200 C:2015718 Min:      3 Act:   29 Avg:   17 Max:    3520
T:11 (17859) P:80 I:200 C:2015339 Min:      4 Act:   26 Avg:   16 Max:    2046
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    • [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [Help] Audio crackles when CPU is under heavy load and music is in the background in c/linux4noobs@programming.dev
    [–] [S] 2 points 1 week ago* (last edited 1 week ago) (5 children)

    closing easyeffects helped with VLC, but it still crackles occasionally in MPV and frequently in spotify

    journalctl has no messages generated when crackling.

    edit: reading through the pw-top article and it might give me clue

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    • 21
    [Help] Audio crackles when CPU is under heavy load and music is in the background (programming.dev)
     

    Any linux wizards know why when my sound sources go to background and CPU is under heavy load the audio crackles?

    apps tested: minecraft, vlc(flatpak), spotify(flatpak), other fltapaks
    crackles on both bluetooth and minijack headphones,
    disabling microphone, easyeffects, gpu screen recorder ( gsr-default_output) didn't help

    I use blender to put the load on CPU but it also happens when compiling or gaming

    I have increased stuff in cat /etc/pipewire/pipewire.conf 

    […]
## Properties for the DSP configuration.
    default.clock.rate          = 192000
    #default.clock.allowed-rates = [ 48000 ]
    default.clock.quantum       = 1024
    default.clock.min-quantum   = 32
    default.clock.max-quantum   = 4096
[…]

    pw-top -b
S   ID  QUANT   RATE    WAIT    BUSY   W/Q   B/Q  ERR FORMAT           NAME 
S   29      0      0   
***
   
***
 
***
 
***
    0                  Dummy-Driver
S   30      0      0   
***
   
***
 
***
 
***
    0                  Freewheel-Driver
S   45      0      0   
***
   
***
 
***
 
***
    0                  Midi-Bridge
S   48      0      0   
***
   
***
 
***
 
***
    0                  bluez_midi.server
R   52   2048 192000  10,6ms  69,7us  0,99  0,01  453    S32LE 2 48000 alsa_output.pci-0000_06_00.6.analog-stereo
R  213    900  48000 229,0us  69,1us  0,02  0,01    0    F32LE 2 48000  + Firefox
R  219      0      0  13,0us  41,1us  0,00  0,00    0    F32P 2 192000  + easyeffects_sink
R  217      0      0    +++   17,0us  +++   0,00  428                   + ee_soe_output_level
R  174      0      0   9,3ms  34,3us  0,88  0,00  5416                   + ee_soe_spectrum
R  206    512  48000 300,5us  54,3us  0,03  0,01    0    F32LE 2 48000  + java
R  186    900  48000 359,5us  56,2us  0,03  0,01    0    F32LE 2 48000  + Firefox
R  242    900  48000 417,2us  52,4us  0,04  0,00    0    F32LE 2 48000  + Firefox
R  129    960  48000 152,1us  74,5us  0,01  0,01    0    S16LE 2 48000  + gsr-default_output
R  116   1920  48000 472,4us  62,5us  0,04  0,01    0    F32LE 2 48000  + VLC media player (LibVLC 3.0.23)
I   53   4096 192000   8,9us   3,3us  0,00  0,00  109   S32LE 2 192000 alsa_input.pci-0000_06_00.6.analog-stereo
S   68      0      0   
***
   
***
 
***
 
***
    0                  v4l2_input.pci-0000_06_00.3-usb-0_3_1.0
I  191      0      0   0,0us   0,0us  ???   ???     0    F32LE 2 48000 Firefox
I  216      0      0   0,0us   0,0us  ???   ???     0    F32LE 2 48000 Firefox
I  220      0      0   0,0us   0,0us  ???   ???     0    F32LE 2 48000 Firefox
S  244      0      0   
***
   
***
 
***
 
***
    0                  Blender
I  205      0      0   0,0us   0,0us  ???   ???     0    F32LE 2 44100 spotify
R  249   2048 192000  10,7ms  35,5us  1,00  0,00  1339    S16LE 1 48000 alsa_input.usb-145f_Trust_GXT_242_Microphone-00.mono-fallback
R  120      0      0  12,2us  13,5us  0,00  0,00    7    F32P 2 192000  + easyeffects_source
R  145      0      0   6,2us   8,2us  0,00  0,00   90                   + ee_sie_output_level
R  230      0      0   5,7us   7,6us  0,00  0,00  118                   + ee_sie_spectrum
R  144    960  48000  18,9us  49,7us  0,00  0,00    0    S16LE 2 48000  + gsr-default_input
R  257      0      0 122,2us    +++   0,01  +++   1101                   + ee_sie_rnnoise
R  106      0      0  44,8us 139,8us  0,00  0,01  236                   + ee_sie_stereo_tools
R   84      0      0   
***
   8,6us 
***
  0,00  235                   + ee_sie_crossfeed
R  158      0      0   5,3us   7,8us  0,00  0,00   30                   + ee_sie_reverb
R  171      0      0   5,2us   8,9us  0,00  0,00    4                   + ee_sie_equalizer
S  172      0      0   
***
   
***
 
***
 
***
    0                  plasmashell
S  119      0      0   
***
   
***
 
***
 
***
    0                  plasmashell
S  233      0      0   
***
   
***
 
***
 
***
    0                  ee_test_signals
S  193      0      0   
***
   
***
 
***
 
***
    0                  plasmashell
I  175      0      0   0,0us   0,0us  ???   ???     0    F32LE 2 48000 plasmashell

    I know to little to dig into the scheduler stuff. systemctl status rtkit-daemon prints about pipewire sucess at priority 20.

    I am on KDE/linux (bazzite based on fedora atomic44)

    --------------
OS: Bazzite x86_64
Host: 82JU (Legion 5 15ACH6H)
Kernel: Linux 7.1.3-ogc3.4.fc44.x86_64
Uptime: 4 hours, 46 mins
Packages: 2 (appimage), 4 (brew), 1 (brew-cask), 173 (flatpak), 3014 (rpm)
Shell: bash 5.3.9
Display (BOE08E8): 1920x1080 in 16", 120 Hz [Built-in]
DE: KDE Plasma 6.7.2
WM: KWin (Wayland)
WM Theme: leaf-dark-color
Theme: Fusion (LeafDark) [Qt], Vapor [GTK2/3]
Icons: breeze-dark [Qt], breeze-dark [GTK3/4]
Font: Noto Sans (10pt) [Qt], Noto Sans (10pt) [GTK3/4]
Cursor: Teto (30px)
Terminal: konsole 26.4.3
CPU: AMD Ryzen 5 5600H (12) @ 4.28 GHz
GPU 1: NVIDIA GeForce RTX 3060 Mobile / Max-Q [Discrete]
GPU 2: AMD Radeon Vega Series / Radeon Vega Mobile Series [Integrated]
Memory: 12.05 GiB / 13.49 GiB (89%)
Swap: 16.62 GiB / 35.59 GiB (47%)
Disk (/): 49.00 MiB / 49.00 MiB (100%) - overlay [Read-only]
Disk (/etc): 845.89 GiB / 929.93 GiB (91%) - btrfs
Local IP (tun0): 10.96.0.42/16
Battery (L20M4PC0): 100% [AC Connected]
Locale: pl_PL.UTF-8
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