Hi Vincent,
On Thu, May 17, 2012 at 10:15:36AM +0000, vincent cui wrote: > > When lwIP performance goes down, the Ethernet DMA's RX buffer > unavailable flag is always set ... don't know why, it seems HW > problem. This is kind of a hazardous way to suspect first a hardware problem before checking the software driver. From here, it looks like a faulty behavior in the DMA interrupt handler of your MAC driver. Sylvain
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