[OpenWrt-Devel] Enable BPF JIT by default?

[Helmut Schaa]

On Thu, Nov 5, 2015 at 5:56 PM, John Crispin <blogic at openwrt.org> wrote:
> On 05/11/2015 17:54, Helmut Schaa wrote:
>> Since lots of architectures now support BPF JIT would it make sense to
>> enable it by default for all openwrt builds?
>> Any opinions on that?
>
> can you grab some stats so we can compare kernel size on a few targets ?

Just quickly tried mips and x86_64:

On mips:

openwrt-ar71xx-generic-uImage-gzip.bin +4.605 bytes
openwrt-ar71xx-generic-uImage-lzma.bin +2.836 bytes

On x86_64:

openwrt-x86_64-vmlinuz +3.168 Bytes

So kernel size increase is in the ~5K range.
Not sure if this would justify an extra config option or enabling it
by default makes sense.

Performance-wise this change would only matter for BPF usage but on some archs
even BPF JIT for seccomp filters gets accelerated ...

Helmut
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