Re: [lwip-users] Memory Limitation of lwIP?

[nrichard]

address@hidden wrote
> nrichard wrote:
>> I have been able to get these all running
>> at the same time using the HEAP? method by setting both MEM_LIBC_MALLOC
>> and
>> MEMP_MEM_MALLOC to 1.  However it is not consistent.  Sometimes the
>> system
>> tells me "memp_malloc: out of memory in pool PBUF_POOL" even though I'm
>> using the HEAP method (I thought).
> 
> This is expected.  Although using the heap instead of multiple pools,
> statistics and error messages
> are still kept per pool, as this makes it easier to start with heap and
> use the statistics to size the pools later.
> 
>> Is it bad to have all these applications running off of the HEAP method?
> 
> You should be aware of the possibility of heap fragmentation and the fact
> that memory allocation
> can at some point get really slow depending on the free block count and
> sizes on your heap.
> 
> Other than that, it should work. For the reasons above, pools are
> preferred though.

I'm going to try using pools, just to see if it works better for my system.

I have gathered the following memory results for pools:

MEM HEAP
        avail: 43008
        used: 0
        max: 5144
        err: 0

MEM UDP_PCB
        avail: 2
        used: 1
        max: 1
        err: 0

MEM TCP_PCB
        avail: 4
        used: 0
        max: 4
        err: 0

MEM TCP_PCB_LISTEN
        avail: 8
        used: 2
        max: 2
        err: 0

MEM TCP_SEG
        avail: 16
        used: 0
        max: 4
        err: 0

MEM REASSDATA
        avail: 2
        used: 0
        max: 0
        err: 0

MEM FRAG_PBUF
        avail: 6
        used: 0
        max: 0
        err: 0

MEM SYS_TIMEOUT
        avail: 3
        used: 2
        max: 3
        err: 0

MEM PBUF_REF/ROM
        avail: 4
        used: 0
        max: 2
        err: 0

MEM PBUF_POOL
        avail: 32
        used: 16
        max: 17
        err: 0

If I'm using pools now, does it make sense for MEM HEAP to be using 5144 of
43008?  This is definitely a decrease from before (35k down to 5k).

I also see "memp_malloc: out of memory in pool TCP_PCB" being printed each
time I visit a web page.  I have my pbuf pool set to 32, yet it only uses
16.  Is this also normal behavior?

This also broke functionality for SNMP, but I will look into that
afterwards.

Plus side: hasn't crashed yet.



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