Hi > > 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: http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2005-October/031736.html Maybe we could try DMA and see what happens. Any hints how to try this, because I haven't worked with DDMA before? BR, Matej
