[lwip-devel] [task #7890] Review heap usage

[Simon Goldschmidt]

Update of task #7890 (project lwip):

                Priority:              5 - Normal => 3 - Low                

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Follow-up Comment #1:

Remaining users of heap (that cannot be configured to use statically
allocated memory) are:
- netdb (16, 36 or 'namelen' of bytes -> 16 up to ~1460 bytes?)
- snmp (16, 32, 28, value_len, array-of-u32_t, len(u8_t) -> anything between
1 and 255 bytes)
- autoip (10 bytes)
- dhcp (? 1 up to ~1460 bytes?)

So, all in all, we have only few occurrences left. I can live with netdb, but
the downside is that for dhcp and snmp, the maximum size is unknown.

For dhcp (since boot_file_name is currently unused (why?)), it would be
enough to have a netif_dhcp which reserves space for a struct dhcp, the
maximum size of options_in and dhcp_msg.

However, for snmp, I'm not sure :-(

Note that I am not interested in 'allocate-once-on-startup' allocations but
only in 'runtime-alloc-and-free' allocations to be able to minimize the heap
size without risking fragmentation.

To regard this as fixed, we can either
- live with all the heap going into statically allocated pools or
- solve dhcp and dig into snmp a bit or
- a bit of both

Is there anyone interested in this except for me? ;-)

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