Re: [lwip-devel] How to understand TCP_SND_BUF

[narke]

On 28 December 2011 02:04, Simon Goldschmidt <address@hidden> wrote:
> narke <address@hidden> wrote:
>
>> I found the value of TCP_SND_BUF was assigned directly to snd_buf
>> attribute when a new pcb was allocated.   Then I lost understanding
>> why this variable should be used.
>>
>> It's different with snd_wnd,  which is dynamically changed after a new
>> value is advertised from the peer end.
>> It's also has nothing to do with memory space of sending pbufs, which
>> is determined by MEM_SIZE constant.
>
> You got the point without noticing it: snd_buf does limit the memory space of 
> sending pbufs, not for the whole stack but for single connections. It is used 
> to prevent one connection from using up all memory.
>
> Simon
>

Got it!  Very clear.


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Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

narke
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