[ECOS] Low network throughput using DHCP

[Andrew Lunn]

On Fri, Aug 09, 2002 at 05:37:35PM +0800, Xavier wrote:
> Hi,
> 
> Had someone experienced that the networking performance
> dropped down dramatically while using DHCP? My CPU
> is a 50MHz MIPS, and the result of tcp_echo is around
> 4Mbps when using static IP, but dropped down to about
> 0.4Mbps when using DHCP. Another aspect is that the
> tftp_client_test failed almost every times to get a file of
> 20K bytes via TFTP when using DHCP, but the same test
> program worked well by using static IP.
> 
> Any suggestions?

Check to see if there any DHCP operations going on while the data
transfer is happening. The DHCP client does some strange things with
the interface to ensure that the DHCP messages go out the correct
interface when you have more than one. These could be affecting
performance, but does seem unlikely to be that bad.

        Andrew

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