Re: [lwip-users] LWIP Delay between Consecutive Packets

[Kieran Mansley]

On Tue, 2008-09-30 at 12:11 -0400, Gary Olson wrote:
> Hi Kieran,
> 
>   Actually I am in trouble in my Xilinx Design since my bandwidth is not
> good enough to handle the data rates required.
> According to the PC Timing information.  I get a bandwidth of about 7.0
> Megabytes per second on a Gigabit Interface.
> Or 56.5 Megabits per second.
> 
> Now each individual packet I send is 4040 bytes and can be sent in around 14
> - 16 us by the PC.  But the Time between each packet
> Is approx 500 us.  If I can figure out how to shorten this time I may
> improve my bandwidth.  I need to 
> double my bandwidth to about 14 Megabytes per second be successfull with
> this design.  My requirement is about 6 Picture frames 
> a second and at about 7 Megabytes I can probably get 3 Frames per second.

Obviously the hardware you run on will affect the performance that is
achievable, but others have seen significantly higher bandwidth than
that.  It might help to know which API you're using (sockets will be
much slower than the raw API) and which version of lwIP you're using.

Kieran