In message: <2008...@cicely7.cicely.de> Bernd Walter <tic...@cicely7.cicely.de> writes: : On Tue, Sep 09, 2008 at 03:33:30PM +0200, Jacques Fourie wrote: : > Hi, : > : > I've performed some benchmark tests on my Gumstix Connex 400 (Intel : > Xscale PXA 255 CPU clocked at 400MHz) with a netDuo expansion board. : > This board has two smc network interfaces. I configure the gumstix as : > a router and measure network throughput with netperf running on : > seperate boxes on either side of the gumstix. My initial tests showed : > a TCP throughput of 2Mbit/s. After adapting the smc driver to use DMA : > this figure went up to 7Mbit/s. Although this is a significant : > improvement, it still seems to be a bit slow. Does anyone have any : > tips on how I can go about to try and figure out where the bottleneck : > lies? Initial profiling showed that a significant amount of time was : > spent doing memory to memory copies of data, but after the DMA change : > profiling does not show any obvious culprits. : : I don't know the PXA255, but I do know the AT91RM9200 and I expect the : PXA255 to be a bit faster. : With the RM9200 I can get ~8Mbit/s routing PPPoE with NAT and small : ipfw table. : This is done with the internal MAC using VLAN, so there is also VLAN : overhead. : Plain routing should be faster.

Does the gumstick have 100BaseTX? The AT91RM9200 is 10BaseT only... Well, 10Mbps only since the phy is external..

Warner