big udp packets

Dan McGuirk djm at
Thu Oct 14 18:19:29 PDT 1999

On Thu, 14 Oct 1999, Patrick Tullmann wrote:
> I had trouble with Kaffe receiving large UDP packets (~45K).  It
> turned out that the default buffer size under FreeBSD wasn't big
> enough.  I "fixed" the problem with the attached patch.  (Basically I
> asked the kernel to reserve 128K for reach UDP socket).
> I'm not sure if this is something we should foist on all Kaffe users,
> though.  Thoughts?

Probably not.  Most people don't send packets that big, and the buffers
can take up a lot of memory if you're using, say, hundreds of sockets.
(Well, at least they do on *BSD, where the buffers are allocated in
advance.  In Linux, the buffers grow dynamically up to a maximum size of

It would be nice if all of the available socket options were accessible
from the application level, but I guess that's just a matter of how Sun
wants to define the API's...

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