On 5 May 2016 at 14:56, <cinap_lenrek@felloff.net> wrote:

> libdraw determines the iounit in initdraw() and sizes
> its write buffer accordingly. uploading pixels into a image
> will split the y/Y operation in multiple ones so they fit
> into the buffer.
>

Yes, and the data doesn't go through rio (unlike an older system), but to
/dev/draw, so in the local graphics
case the kernel is pulling the draw data directly from the client memory:
it doesn't go through 9p.
If /dev/draw is imported from a remote system, the local system will
generate the 9p, and the remote
will receive that, turn round and access its /dev/draw.