[lkml]   [2004]   [Jul]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch
    Lee Revell wrote:

    >>Plus what's very important is that every kernel developer and driver
    >>developer (even thirdparty, especially those
    >>that do closed source stuff like Nvidia etc) takes into account the
    >>latency problems that code paths that run for
    >>too long time (or disable IRQs for too long etc) might create.
    >>While I'm not a kernel expert I assume the premptible kernel alleviates
    >>this problem but I guess it still cannot
    >>completely get rid of low latency-unfriendly routines and drivers.
    >Yes, this is important. One problem I had recently with the Via EPIA
    >board was that unless 2D acceleration was disabled by setting 'Option
    >"NoAccel"' in /etc/X11/XF86Config-4, overloading the X server would
    >cause interrupts from the soundcard to be completely disabled for tens
    >of milliseconds. Users should keep in mind that by using 2D or 3D
    >hardware acceleration in X, you are allowing the X server to directly
    >access hardware, which can have very bad results if the driver is
    >buggy. I am not sure the kernel can do anything about this.

    that's bad news.
    VIA markets those mini-itx mainboards (with onboard audio/video/network)
    as multimedia appliances and
    therefore I'd expect the hardware providing low latencies when both
    video acceleration and audio is used.
    Hopefully only a driver issue (as in most of cases)

    Since VIA released the unichrome (the gfx chipset contained in their
    mainboards) sources someone should
    contact these folks :
    to check what is causing those latency spikes ?
    Any unichrome developer lurking on LKML ?



    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:04    [W:0.031 / U:8.348 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site