Re: [lwip-users] lwip whole performance down

[vincent cui]

Hi sylvain:

It is really odd... I enable display lwip stats, it shows that there is packet 
dropped..  
 


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Sylvain Rochet
Sent: 2012年5月17日 17:50
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwip whole performance down

Salut Vincent,

On Thu, May 17, 2012 at 12:35:10AM +0000, vincent cui wrote:
> 
> [...]
> I found that it takes a 1 or 2 seconds to open connect successfully .
> [...]

It looks like a not acknowledged SYN packet, which might be dropped somewhere 
from your PHY to lwIP TCP and which is then sent again by your TCP client, use 
Wireshark and check the TCP flow ! :-)

Sylvain