Re: [lwip-users] webserver problem

[Nikolas Karakotas]

It’s a hole different story if it’s a single file aka connection or serving 
many. I have seen this issue with my implementation. Not having enough heap 
and thus a file wasn’t sent.
I use a 4K heap and serving the jquery 91k with multiple connections but 
have optimised the drivers a lot.

-----Original Message----- 
From: Vincent Cui
Sent: Tuesday, July 09, 2013 10:08 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] webserver problem

Dear:

7K RAM for lwIP pool is enough, I use cortex m3 with 128K ram, I allocate 
7KB for it.
My web server is more heavy than yours. My largest size of file is upto 
170KB. It works well too . you should check the RCV_BUFFER NUMBER AND 
SND_BUFFER NUMBER for it.
In my system, I define them to 2, as for limitation RAM.
My https server works fast too .

I think you should write a receive data thread in loop, and use TCPIP tool 
to send data in loop to check if there is interrupt or other issue.
Maybe your Ethernet driver has problem too .


Vincent





Vincent Cui
Firmware Engineer Leader
Shanghai Enlogic Electric Technology Co., Ltd.
Room1106, Building A, New Caohejing Business Centre, No.391, Guiping Road, 
Xuhui District, Shanghai, P.R.China
T: +86 21 34612525, M: +86 13482482211
www.enlogic.com
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-----Original Message-----
From: address@hidden 
[mailto:address@hidden On Behalf Of 
Noam weissman
Sent: 2013年7月9日 PM 8:03
To: Mailing list for lwIP users
Subject: Re: [lwip-users] webserver problem

Hi Marty,

You are absolutely correct it is system dependent.

As you can see from my reply, I used a 7K bytes pool for LwiP.

16M byte is a super computer compared with what I do. I worked with ARM9 
with 96K RAM :-)

With just 7K RAM dedicated to LwIP pool I was able to run a WEB server with 
JQUERY
3 TCP connections, UDP connections etc...

Now let me ask you something. If you have 16M byte RAM why do you use LwIP.
Use Linux with FULL BSD TCP stack. Much better.


BR,
Noam.



-----Original Message-----
From: address@hidden 
[mailto:address@hidden On Behalf Of Pomeroy, 
Marty
Sent: ג 09 יולי 2013 14:55
To: Mailing list for lwIP users
Subject: Re: [lwip-users] webserver problem


> > But If I connect other services, all the pages from webserver are not
loaded.

This does look like a resource problem somehow.  Possibly a timeout firing 
before the jquery response completes (not enough CPU power), or insufficient 
memory to respond, that sort of thing.


Comment to Noam:
> > As default the MSS size is defined to be 1500 bytes. This is too
large for embedded.

Isn't "too large" implementation dependent?  I'm using 1500 on one project 
where we have 16MB of DRAM.  This also reduces the chaining.

Marty


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