[ECOS] rattler PB

Andrew Lunn andrew@lunn.ch
Thu Dec 18 09:45:00 GMT 2003

On Thu, Dec 18, 2003 at 09:22:47AM +0100, alix t wrote:
> We try to develop applications with goahead web server
> and other network services on rattler card , but our
> applications often crash.
> So we want first validate ethernet and IP stacks.
> I think to send very large packets is a good test to
> validate ethernet stack.

Its not a realistic test. I doubt any application will use such large
IP packets. UDP has a maximum packet size of around 4Kbytes. TCP will
generally use either around 800 bytes or around 1500 bytes depending
on if MTU discovery is being used. 

Only a custom application which is not using UDP or TCP can generate
such big IP packets. Typically this would be for connecting super
computers together using HIPI interfaces. Thats why IPv6 has a jumbo
packet which can be bigger than 64Kbytes. 

I suggest you try more realistic tests.


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