Re: [lwip-users] TCP tuning

[Jani Monoses]

> This is what I have been using. Getting a very constant 27 kibibytes/second
> using a 18MHz 16-bit microcontroller.
> 
> #define TCP_MSS                 522

not 512? 

> /* TCP sender buffer space (bytes). */
> #define TCP_SND_BUF             1024
> 
> /* TCP sender buffer space (pbufs). This must be at least = 2 *
>    TCP_SND_BUF/TCP_MSS for things to work. */
> #define TCP_SND_QUEUELEN        (4 * TCP_SND_BUF/TCP_MSS)
> 
> /* TCP receive window. */
> #define TCP_WND                 1024
> 
> 
> Besides this, we noted a 30% performance increase (20 to 27 KB/s) when
> using zero-copy pbufs (PBUF_ROM) instead of first copying to  PBUF_RAM.

How close is that to wire speed or UDP transfer sped in your case Leon?