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    SubjectRe: [Nouveau] [PATCH 09/17] drm/radeon: use common fence implementation for fences
    Am 23.07.2014 11:38, schrieb Maarten Lankhorst:
    > op 23-07-14 11:36, Christian König schreef:
    >> Am 23.07.2014 11:30, schrieb Daniel Vetter:
    >>> On Wed, Jul 23, 2014 at 11:27 AM, Christian König
    >>> <christian.koenig@amd.com> wrote:
    >>>> You submit a job to the hardware and then block the job to wait for radeon
    >>>> to be finished? Well than this would indeed require a hardware reset, but
    >>>> wouldn't that make the whole problem even worse?
    >>>>
    >>>> I mean currently we block one userspace process to wait for other hardware
    >>>> to be finished with a buffer, but what you are describing here blocks the
    >>>> whole hardware to wait for other hardware which in the end blocks all
    >>>> userspace process accessing the hardware.
    >>> There is nothing new here with prime - if one context hangs the gpu it
    >>> blocks everyone else on i915.
    >>>
    >>>> Talking about alternative approaches wouldn't it be simpler to just offload
    >>>> the waiting to a different kernel or userspace thread?
    >>> Well this is exactly what we'll do once we have the scheduler. But
    >>> this is an orthogonal issue imo.
    >> Mhm, could have the scheduler first?
    >>
    >> Cause that sounds like reducing the necessary fence interface to just a fence->wait function.
    > You would also lose benefits like having a 'perf timechart' for gpu's.

    I can live with that, when it reduces the complexity of the fence interface.

    Christian.

    >
    > ~Maarten
    >

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