On 2015-11-06 13:44, Helmut Schaa wrote: > On Thu, Nov 5, 2015 at 5:56 PM, John Crispin <blo...@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 ... The size increase is small enough, so I think we can simply enable it by default. Feel free to send a patch.
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