> > matej> Is there any solution to this?
> > I have similar problem on my several custom boards with SMC91C111. I
> > see so many RX overrun, but I can not see why it happens. Forcing to
> > 10Mbps/HalfDuplex reduced the overrun count (and works better than
> > 100Mbps), but it is not preferable, of course ...
How did you achieve this? By software or by using 10 Mbps switch?
> And yes performance is bad with this chip.
Probably I'll try and switch it to 10 Mbps, because NFS is terrible
because it gets a lot of timeouts because of dropped packets.
> I'm not sure if DMA would
> help much, since the overrun occurs because the chip does not have
> enough internal buffers. I don't think that we can service the interrupts
> fast enough to prevent the overruns...
I found this mail from Nicolas on ARM mailing list:
Maybe we could try DMA and see what happens.
Any hints how to try this, because I haven't worked with DDMA before?