Re: about the tuning of eepro100

[Jeff Garzik <jgarzik@mandrakesoft.com>]

Paweł Krawczyk wrote:
> On Sat, Aug 10, 2002 at 06:55:58PM +0100, Jamie Lokier wrote:
> 
> 
>>I don't think you will get better than 90% performance, but if you do
>>please let me know!  I have written another e100 driver, in an attempt
>>to transmit and receive small packets at the maximum possible rate.
>>In tests, it would not even transmit at 100% small packets on our 82558.
>>(I didn't do that test on our 82559).
> 
> 
> Maybe we were looking for separate things - I had a firewall box with
> 100base-TX interfaces and when flooding it at full rate with small
> (40 bytes, i.e. empty IP headers) packets the system was unusable
> because of the interrupt rate. After I turned the bundling on, there
> was no signs of overload. Of course, I tested throughput of the
> card as well but on the IP level there was no difference I could
> worry about. But as I said, this was a firewall box and I was looking
> for a way to stop possible DOS, not for tiny packet delivery time
> slowdown, which may be important in other applications.


Sounds like you need the NAPI version of eepro100 or e100...  NAPI is 
designed to eliminate the overhead that you describe.

	Jeff