Routing benchmarks

[M. Warner Losh]

In message: <20080909135021.GR1147 at cicely7.cicely.de>
            Bernd Walter <ticso at 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