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[lwip-users] Re: Lwip UDP performance

From: Reither Robert
Subject: [lwip-users] Re: Lwip UDP performance
Date: Tue, 28 Mar 2006 12:12:27 +0200

I'm using this ethernet hardware too and its sad but true, the device does only 
have 4 fixed size (receive) buffers.
So if u receive 4 packets very fast, the (hardware)buffers are full and the 
chip is dropping packets till u have read them out. i'm using DMA data 
transfers and got down to 85┬Ás/packet that's my maximum interface throughput 
running NIOS cpu with 50Mhz (and its not trivial to use DMA with the 91c111, u 
have to serve the ARDY line or use max. Interface speed of 100ns cycle-time, 
and don't 4get to flush CPU data caches after DMA read)

Routing packets thought the stack will take much more time than, but if u have 
send-delays, u can process the packets from a buffer after the bursts.


Hard/Software engineer

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