Re: [lwip-users] Lwip tcp-stack reliability issue when using non-reliable network?

[Itzik Levi]

Hi Noam, 

Thanks.

Just increased both MEMP_NUM_PBUF to 50, MEM_NUM_TCP_PCB TO 15. 

I'm not sure if its harder to reproduce(longer time to run) - maybe. but it still happens..

 

On Tue, Nov 7, 2017 at 5:36 PM, Noam Weissman <address@hidden> wrote:

Hi,

 

Check that you have MEMP_NUM_PBUF 50 or more

that MEMP_NUM_TCP_PCB is 15 or more

 

The above may help, I think.

 

Noam.

 

From: lwip-users [mailto:lwip-users-bounces+noam=address@hidden] On Behalf Of Itzik Levi
Sent: Tuesday, November 07, 2017 5:29 PM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Lwip tcp-stack reliability issue when using non-reliable network?

 

Unfortunately, enabling Nagle did not do the trick, still got the same result. :( 

 

On Tue, Nov 7, 2017 at 4:20 PM, Itzik Levi <address@hidden> wrote:

Thanks for the reply!

 

Actually, the end goal is to integrate the solution into rfcomm.

 

For now, the "physical layer" is being simulated by a single local host tcp connection(under Android OS).

The losses are simulated by simply randomly dropping data in lwip's pppos "output_cb".

 

I'll attempt to re-enable Nagle, see if there is any changes and report back.

 

 

 

On Tue, Nov 7, 2017 at 4:09 PM, Gisle Vanem <address@hidden> wrote:

Itzik Levi wrote:

I'll go over your lwipopts and see whether I missed something.
In addition, I will attempt to useSO_SNDTIMEO and SO_RCVTIMEO instead of polling in parallel to write and read(I understand by the samples its a more health way of using this api).

If you have anymore suggestions, that will be great!

I think you wrote earlier than you had disabled
"Nagle algorithm". Are you sure that's a good idea?
Maybe you're saturating your RF-link with small fragments.

Just a thought since it's almost never a good idea to
turn off Nagle.

--
--gv

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