Routing benchmarks

[Bernd Walter]

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.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.