rtl8139 problems

[James Stevens]

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Eddie Atherton wrote:
> 
> Also, sad to report, that I too have NO problems running the same 2
> machines under Micro$oft Windoze NitwiT. Both machines can send and receive
> to their hearts content.

IMHO: the problem is due to the Tx buffer filling up. I am running the
card in 10Mhz mode and so it is pretty easy to fill up the Tx buffer and
hang the card. I would think this should be something that will be
pretty easy to fix, but I don't know the ins-and-outs of ethernet
drivers or this cards otherwise I'd have a go myself (any volunteers ?)

I also have an app called "open_socket" that saturates a line to test
the throughput speed between two points, reporting bytes of user data
downloaded per second. The app is also useful for seeing much CPU
individual ethernet cards require and lets us judge which cards to use
in what products. 

I have attached a copy. To use it in line speed test / saturation mode
you require a remote server to test with, which must have "chargen"
running on port 19. "chargen" is normally a built-in feature of "inetd"
and simply generates a 70 character ASCII barber pole. "open_socket"
takes 4 parameters they are <server> <port> <command to send> & <bytes
to read>. For line speed test mode type :-

open_socket <server> 19 "" -1

"" = no command, -1 = infinite bytes to download. You can also use
"open_socket" to download a web page, try :-

open_socket www.sun.com 80 "GET /"

With me, running "open_socket" to AND from a 8139 based system at the
same time locks it up within a few seconds, but it can happily client OR
server to about 1,100,000 bytes/s with no problems. As a client this
only take 6% cpu (94% idle), as a server it takes about 40% cpu on a
P75.

James
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