Re: [lwip-users] lwIP performance

[Kieran Mansley]

On Wed, 2010-02-03 at 23:27 +0800, yueyue papa wrote:
> Hi All,
>  
> I make the 1.3.2 lwIP running in LAN environment.  My CPU is about 96M
> MIPS platform.
>  
> FTP client is used as a download speed test, the current speed is
> about 200k/s.  Is it a reasonable speed for lwIP?
>  
> I think the speed may be a bit slow, but I did not known the where is
> the problem.  I found the socket windows update will make the speed
> down heavily.
>  
> My performance tune process
> 1> pull mode ==> interrupt mode
>      20k /s ==> 30k/s
> 2> removed some interrup delay and ...
>     30k/s ==> 80k/s
> 3> CPU freqent from 48M ==> 96M hz
>     80k/s ==> 180k/s
> 4> MSS 1K ==> 1460
>     180K/s ==> 196K/s

What units are your measurements in?  k/s could be Kilo-bits or
Kilo-bytes.  Your experiments suggest that your network speed is limited
by CPU speed, as everything you change to make it faster has reduced the
load on the CPU.

Kieran