Hi Simon,
I'm using the TM4C1294 which is cortex M4 running at 120MHz so I hope to be
able to give you some feedback in the near future. Although with data
coming into the GPIO ports at 800kHz and being written to ping pong buffers
I'm a little concerned, despite the uDMA. But that's a different bridge to
cross.
Lee.
On Fri, Dec 19, 2014 at 5:00 AM, Simon Goldschmidt [via lwIP] <
[email protected]> wrote:
>
> Noam weissman wrote:
> > Do not expect high throughput from LwIP. It is small but not very fast.
> > I have read people are able to run it at about 1Mb, maybe I am wrong.
>
> Yes, you are. Getting 1 MByte/second on a TCP connection (if that's what
> you mean by 1Mb), is much too slow for lwIP. Back in 2006, I was able to
> get ~2,5 MByte/s without too much effort on a 50MHz Altera-Softcore
> processor with a MAC that required me to copy every packet to/from its
> buffers.
>
> Nowadays, having a Cortex-M and a zero-copy MAC, I'd expect to get much
> better rates. I haven't had a chance to test it, though, as we're still
> stuck with that old platform. I always wanted to benchmark it again,
> maybe I'll have to try and get a benchmark platform running...
>
> Anyway, if you're getting 1MByte/s only, I have no doubt there's
> something wrong with your lwIP configuration or with the port you're
> using. (Or you have set up lwIP to be slow to prevent it from stealing
> the CPU from more important tasks)
>
>
> Simon
>
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