On Mon, Mar 25, 2002 at 02:06:19PM -0800, Lars Eggert wrote:
> Matthew Luckie wrote:
> >>>Is there a mechanism to tell when ip_output should be called again?
...
> >if you could suggest a few modifications that would be required, i'd like
> >to pursue this further.
>
> Look at tsleep/wakeup on ifnet of if_snd.
I am under the impression that implementing this mechanism would
not be so trivial. It is not immediate to tell back to the caller
on which interface ip_output() failed. Nor there is a common place
that i know of where you can be notified that a packet was successfully
transmitted -- i suspect you should patch all individual drivers.
Finally, there is the question on whether you do a wakeup as soon
as you get a free slot in the queue (in which case you most likely
end up paying the cost of a tsleep/wakeup pair on each transmission),
or you put some histeresys.
cheers
luigi
> Lars
> --
> Lars Eggert <[EMAIL PROTECTED]> Information Sciences Institute
> http://www.isi.edu/larse/ University of Southern California
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