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Thread: [KDE4] bad performance

  1. #1

    Default [KDE4] bad performance

    KDE4 has worse graphical performance than KDE3, that is know.
    It is because bad drivers...

    But what I'm experiencing is general bad responsiveness (a lot disk activity, like if swapping is going on). After some usage everything slows down to a crawl!

    I checked free output, but swap is untouched:
    Code:
    free -m
                 total       used       free     shared    buffers     cached
    Mem:          1519       1487         31          0          3       1108
    -/+ buffers/cache:        375       1144
    Swap:         1027          0       1027
    My machine is:
    Athlon 64 2800+
    1.5 GB ram
    ~500GB of disks
    Nvidia 7600GT or Radeon 9250

    For e.g. opening dolphin → disk activity raises a lot
    opening ktorrent → disk activity, opening opera → disk activity.
    Cold starts are long, but warm are nothing shorter. Under KDE3 there isn't that much disk activity. What could be the reason in first place for that?

    Opening a movie from ktorrent → it needs seconds before it starts to play!
    And even worse, closing mplayer will lead to a black screen and disk activity will raise again (really seems like it is swapping, but free shows nothing).

    In KDE3 movie opens in under a second, without disk trashing around that much and closing it it's like nothing ever happened, desktop is super responsive.

    What could be the problem of that?
    I like a lot KDE4 but this makes me really think about using it ever again.

    KDE4 was installed from Factory repo (4.2 RC).

    I also retested everything with a radeon, just to be sure nvidia drivers aren't interfering.

  2. #2

    Default Re: [KDE4] bad performance

    UPDATE: It was ktorrent, lowering speed helped.
    However in kde4 always when moving larger files starts to show above simptoms, meanwile kde3 is unaffected.

    It is a bug somewhere in kde4.

  3. #3
    Join Date
    Jun 2008
    Location
    /dev/belgium
    Posts
    1,946

    Default Re: [KDE4] bad performance

    I'm also using kde 4.2rc1 from factory and do not experience said problems. You may want to make sure that KDE4 Desktop Search and Akonadi are disabled, other than that I don't know what's going on with your system. The only irritating problem I experience here is with the grouping of icons in the taskbar where they change the black background color, see pic below



    other than that, kde 4.2rc1 is pretty snappy here

  4. #4

    Default Re: [KDE4] bad performance

    Updating status:
    after using kde3 for a day, I can say it's the same.

    KDE3 is graphically more responsive than kde4, so this contributed to my early judgements about this happening only on kde4.

    So, it's a system issue.

  5. #5

    Default Re: [KDE4] bad performance

    Is this vmstat output ok:
    Code:
    procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- 
    r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
    1  2   3296  33232   1564 1164348    0    0 13396 57384  730  531  7 15  0 78
    0  2   3296  32860   1564 1165508    0    0 54024 12336  980  764  9 28  0 63
    1  2   3296  33976   1556 1165152    0    0 56796     0 1037 1041  6 29  0 65
    0  1   3296  33604   1572 1165560    0    0 47772 24744 1038 1252  9 28  0 63
    3  1   3296  33496   1588 1166068    0    0 44372 44848 1151 1882 17 27  0 56
    1  1   3296  34612   1596 1164608    0    0 37200 32768  865  843  8 22  0 70
    0  2   3296  33000   1604 1166540    0    0 41112 40960  880  767  7 26  0 67
    1  1   3296  32752   1596 1166372    0    0 47752 46392  994  708  9 27  0 64
    1  1   3296  33792   1588 1165392    0    0 45576 45344 1034  803  9 28  0 63
    0  2   3296  33048   1696 1164724    0    0 11160 72104  779  520 10 12  0 78
    2  3   3296  34396   1740 1162768    0    0  7264 55776 1012 1476 10 13  0 77
    0  2   3296  32908   1752 1165360    0    0 35608 11792 1041 1499  7 21  0 72
    When copying 6GB file from /home to /multiMedia (2 different disks), even mouse movement became sluggish.

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