[lwip-users] Re: lwip-users Digest, Vol 88, Issue 17

[Chen]

Hi Kieran,

Thanks for your reply!

Here is the answer to your questions:

1) I am using TCP API. 

2) I didn't change MEMP_NUM_TCP_SEG  since you didn't think it was
the problem anyway.

3) Changing #define MEMP_NUM_NETBUF 3 to #define MEMP_NUM_NETBUF 30 did
not help.

4) Sorry, but I don't know how to use LWIP_STATS:

In lwipopts.h, I already have #define LWIP_STATS 1, I
added stats_display() to my code, but it displays nothing.
I read into stats.c, first, I am not sure which one
is more critical to monitor (I assume it is the memory?). Secondly, say I
wish to monitor memory since we suspect memory resource, I assume I
should use stats_display_mem, but I have no clue what
to complete the call so that I can do it.

Any pointer on how to proceed?

Thanks again for your time,

Chen

At 12:00 PM 12/14/2010, you wrote:

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Today's Topics:

   1. Re: Re: lwip-users Digest, Vol 88, Issue 15 (Kieran Mansley)


----------------------------------------------------------------------

Message: 1
Date: Tue, 14 Dec 2010 15:28:30 +0000
From: Kieran Mansley <address@hidden>
Subject: Re: [lwip-users] Re: lwip-users Digest, Vol 88, Issue 15
To: Mailing list for lwIP users <address@hidden>
Message-ID: <address@hidden>
Content-Type: text/plain

On Tue, 2010-12-14 at 10:12 -0500, Chen wrote:
>
> Also attached is lwipopts.h, and I checked a few times, and believed
> I specify a decent tx buffer.
>
> /* TCP sender buffer space (bytes). */
> #define TCP_SND_BUF             30000
>
> Maybe you can point out my mistake in the setting, or maybe there is
> an error in lwip that ignores such setting.

Your buffer size and TCP_SND_QUEUELEN look fine. 

Which API are you using? If netconn or sockets API then this is probably
limiting you:

#define MEMP_NUM_NETBUF         3

You also have a relatively small value for this (although clearly this
isn't your current limiting factor):

/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
*/
#define MEMP_NUM_TCP_SEG        9


I would suggest using the LWIP_STATS code to see which resources are
reaching their maximum, and adjusting appropriately.

Thanks

Kieran




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