BUG: udp socket, getsockopt + setsockopt

Val Henson val at nmt.edu
Wed Jan 30 14:41:02 EST 2002

I'm not sure what version this change appeared.  Also, your pc may
have different default socket size settings.  This command will show
you both the max and default settings:

cat /proc/sys/net/core/?mem_*

(You can also set them in the usual way.)


On Tue, Jan 29, 2002 at 07:26:56PM -0800, David Ashley wrote:
> I forgot to mention it doesn't act the same on my x86 desktop running
> linux. I don't recall what version. On my pc there is no trouble.
> Oh well.
> Thanks--
> Dave
> >When you set SO_RCVBUF with setsockopt, the kernel allocates twice the
> >memory you set.  This has something to do with BSD compatibility and
> >storing internal kernel structures in the memory allocated for the
> >recv buf.  Try getsockopt after you setsockopt.
> >
> >This is ostensibly a feature, not a bug.  Search the linux-kernel
> >archives for "so_rcvbuf" and "David Miller".  Hint: you probably won't
> >convince Dave to change his mind.
> >
> >-VAL

** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/

More information about the Linuxppc-embedded mailing list