Routing benchmarks

[Jacques Fourie]

On Tue, Sep 9, 2008 at 3:55 PM, Stanislav Sedov <stas at freebsd.org> wrote:
> On Tue, 9 Sep 2008 15:33:30 +0200
> "Jacques Fourie" <jacques.fourie at gmail.com> mentioned:
>
>> 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.
>>
>
> Have you tried checking the speed of the interface itself? Without
> routing involved? May it be the interfaces itself being so slow?
>
> --
> Stanislav Sedov
> ST4096-RIPE
>

Running netserver on the gumstix shows a throughput of 2.4Mbit/s. At
the moment I can't get if_bridge to work - will try to figure out what
is going on. A bridging benchmark may be more informative.