wengzhe commented on PR #11054:
URL: https://github.com/apache/nuttx/pull/11054#issuecomment-1794479171
> @wengzhe per @gregory-nutt comment
>
> > Supporting the second address has size/performance implications and
probably should be a Kconfig option.
>
> What is the size hit on code space for this? Can it be Kconfig-ed out?
Hi @davids5, I've tested this PR on `stm32f4discovery:netnsh` and
`stm32f4discovery:ipv6`, basically, the configs that don't use IPv6 won't be
affected much.
On `stm32f4discovery:netnsh`, which only enables `CONFIG_NET_IPv4`, the code
size increases 60 Bytes
```
> arm-none-eabi-size stm32-*
text data bss dec hex filename
152108 1184 24092 177384 2b4e8 stm32-netnsh-master
152168 1184 24092 177444 2b524 stm32-netnsh-this
```
On `stm32f4discovery:ipv6`, which uses `CONFIG_NET_IPv6`, the common code
size increases 480 Bytes with `CONFIG_NETDEV_MULTIPLE_IPv6=n`, and increases
2KB if we enable this new feature `CONFIG_NETDEV_MULTIPLE_IPv6` and set
`CONFIG_NETDEV_MAX_IPv6_ADDR` to 8.
```
> arm-none-eabi-size stm32-*
text data bss dec hex filename
137346 1148 31332 169826 29762 stm32-ipv6-master
137826 1148 31332 170306 29942 stm32-ipv6-this-1addr
139402 1148 31572 172122 2a05a stm32-ipv6-this-8addr
```
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