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Re: [lwip-users] Problem with sending big buffers to lwip_write and sema


From: Kieran Mansley
Subject: Re: [lwip-users] Problem with sending big buffers to lwip_write and semaphoresduring big downloads.
Date: Wed, 11 Apr 2007 10:23:51 +0100

On Wed, 2007-04-11 at 10:20 +0200, address@hidden wrote:

> The first problem is sending big buffers to lwip_write. If I send in a
> buffer that are bigger then a ethernet frame (3000 bytes) then LWIP
> will send the first buffer but my second call to write will not work. 

Can you describe in what way it doesn't work?  Does the lwip_write
function return an error for example?

> The other problem is with semaphores. This is quite a small problems
> as I seems to be able to work around it by streaming smaller amount of
> data. Anyway, If I connect to a server and starts streaming data over
> TCP via LWIP. Then everything works fine until about 100 MB of data
> when our platform assert based on more calls to sys_sem_signalthen to
> sys_arch_sem_wait.

I haven't heard of that particular problem before.

Kieran





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