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Re: [lwip-users] Relationship between lwIP options

From: Simon Goldschmidt
Subject: Re: [lwip-users] Relationship between lwIP options
Date: Tue, 04 Aug 2009 07:23:06 +0200

> If you say PBUF pool is only for incoming packet, then lwip SNMP driver is
> in Fault.

I know, there's some 'room for improvement' in the snmp code... In any case 
it's a bad example and the pbuf pool really should only be used for incoming 
packets right now.

The reason is that *if* outgoing packets would empty the pbuf pool, there would 
be no pbufs left for incoming packets and the stack might stall (e.g. incoming 
packets would be needed to free outgoing TCP packet that are queued for ACK).

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