Re: [lwip-users] lwip does not ack retransmissions

[john bougs]

--- On Tue, 1/27/09, Jonathan Larmour <address@hidden> wrote:

> bill wrote:
> > What is your TCP_SND_QUEUELEN?  If you tie up all of
> your pbufs to send
> > queued packets, you won't have any pbufs left to
> support receiving packets.
> 
> It mostly depends what sort of pbufs. Most pbufs for tx
> data are PBUF_RAM,
> most pbufs for rx data are PBUF_POOL, so those are
> different classes of
> pbufs allocated from different places. The only likely time
> it seems
> possible to have problems with reception if you've
> allocated so many
> PBUF_RAM pbufs that the stack can't even generate an
> ACK packet. Unless you
> are actually allocating PBUF_POOL pbufs in your application
> or something
> like that, of course.
I'm not sending much data and I'm not allocating any pbufs except in ethernetif 
low_level_input().

Also in some case I can have lwip  send  re-transmissions while in this locked 
state, so the TX side is not locked, its just the RX side (no PBUF_POOL 
available).