[lkml]   [2007]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: tiny tty driver sample
    > > Unless data_size can be very large and high speed then you can replace the
    > > lot with
    > >
    > > if (tty_insert_flip_string(tty, data, data_size))
    > > tty_flip_buffer_push(tty);
    > >
    > What does "very large and high speed" mean in this context?

    The default behaviour is to generate buffers based upon perceived need
    and then cycle them, so you tend to get chunks of 512 bytes or so. The
    logic is abstracted into tty_buffer_find() so can easily be changed.

    Some hardware at high speeds with big FIFOs (or virtualised interfaces)
    produces big chunks of data in blocks with the size known at read time (eg
    that with large fifos and 100 polls/sec) - for those you can avoid
    generating a series of allocations or buffers by using the request_room
    interface to hint the size of the buffer you will actually need.

    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: 2007-03-08 00:39    [W:0.018 / U:0.784 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site