🚀 go-pugleaf

 
In article <slrn5i0vak.4a.faye@james.plaistow.org>,
    faye@emarkt.com (Faye Pearson) wrote ...

> The actual data, file via ftp or whatever, gets cut into packets and then
> wrapped in TCP/IP stuff.  The wire between your computer and your modem
> or ISDN TA is Asynchronous which means you get 10bits sent per character,
> a start bit, the data and a stop bit.  ISDN connections are Synchronous
> (and so are modems with LAPM effectively) so you get 8 bits per character.
> 64kbits = 8K/s not far off the 11K/s maximum (with 16550 UART).  The
> TCP/IP overhead is higher with low MRU size so set it nice and high.

If you are working only on a local network, you can wind up the MTU/MRU to
reduce overheads and increase performance.  However, if you traffic has
to go through routers, your packets will be fragmented if they exceed
the MRU settings used by the routers, reducing performance.

If I recall correctly, most of the routers use an MRU of 576, and
Ethernets use 1500.  If you're generally connecting to non-Demon hosts,
the "Tuning FAQ" recommends an MRU of 576 to avoid fragmentation.  For a
more detailed discussion, see ftp.demon.co.uk:/pu/doc/ka9q/Tuning.faq.

Niel
-- 
Niel Kempson <kempson@snowyowl.co.uk>