Re: [lwip-users] TCP_WINDOW_SIZE Limit

[Kieran Mansley]

On Fri, 2008-10-17 at 10:15 -0400, Gary Olson wrote:
> Hi,
> 
>   I have been trying to increase my bandwidth by increasing the
> TCP_WINDOW_SIZE on the PC.  I have already increased the TCP_WINDOW on
> LWIP.
> 
> I changed the TCP_WINDOW_SIZE to a much higher level in the Regedit
> TCP Parameters area to a very large value of 131400.  However,

I think that increasing it beyond 65536 will have little effect as lwIP
does not support TCP window scaling. 

>       result = setsockopt(m_socket[i], SOL_SOCKET, SO_SNDBUF, ( char
> * ) &buffsize, sizeof(buffsize));

It should never pass, as far as I can tell SO_SNDBUF is not one of the
socket options we support setting.  To change this use the TCP_SNDBUF
compile-time constant.

Kieran