Re: [lwip-users] lwip whole performance down

[vincent cui]

You are right .

When lwIP performance goes down, the Ethernet DMA's RX buffer unavailable flag 
is always set ... don't know why, it seems HW problem.
When performance is high, the DMA RX buffer always available.  


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Sylvain Rochet
Sent: 2012年5月17日 18:04
To: Mailing list for lwIP users
Subject: Re: [lwip-users] lwip whole performance down

Hi Vincent,


On Thu, May 17, 2012 at 09:51:55AM +0000, vincent cui wrote:
> 
> It is really odd...

This is not.


> I enable display lwip stats, it shows that there is packet dropped..  

So, lwIP probably knows it had to drop the SYN packet, you only need to find 
out why.

Again, you HAVE TO get and check a TCP trace first in order to be able to know 
where to look.


Sylvain