[lwip-users] Re: [lwip] MSS and config generally

[Kieran Mansley]

On 6 Jun 2002, Dirk Koopman wrote:
> On Thu, 2002-06-06 at 15:50, Kieran Mansley wrote:
> > Alter TCP_MSS (in lwipopts.h) to your requirements?
>
> Tried that. Made no obvious difference.

Hmm.  What is the MTU of your physical network?

> >
> > Also, make sure that the config options related to this are set to
> > sensible amounts.  Your poor performance could be due to insufficiently
> > sized TCP_SND_BUF, TCP_SND_QUEUELEN or TCP_WND
> >
>
> Given say a 1024 byte MSS, what would say the other parameters should
> look like?

I would say, around 8k for the TCP_WND and TCP_SND_BUF should be
sufficient, and at least 2*(TCP_SND_BUF/TCP_MSS) for TCP_SND_QUEUELEN.

Out of interest, can you quantify how poor your poor performance is?

Kieran

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