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Message-ID: <3D55590E.4020902@mandrakesoft.com>
Date: Sat, 10 Aug 2002 14:18:54 -0400
From: Jeff Garzik <jgarzik@mandrakesoft.com>
Organization: MandrakeSoft
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To: =?ISO-8859-2?Q?Pawe=B3_Krawczyk?= <kravietz@aba.krakow.pl>
CC: Jamie Lokier <lk@tantalophile.demon.co.uk>,
       zhengchuanbo <zhengcb@netpower.com.cn>,
       "linux-kernel @ vger. kernel. org" <linux-kernel@vger.kernel.org>
Subject: Re: about the tuning of eepro100
References: <200208101742654.SM00824@zhengcb> <20020810095126.GF21239@aba.krakow.pl> <20020810185558.C306@kushida.apsleyroad.org> <20020810180256.GD25611@aba.krakow.pl>
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Pawe? 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




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