From a7370b5179f5c9793fb18d087955f51d9c080715 Mon Sep 17 00:00:00 2001 From: Tony Ambardar Date: Mon, 17 Dec 2018 21:29:33 -0800 Subject: kernel: enable CONFIG_BPF_JIT by default Enable the built-in BPF JIT compiler for all 4.9, 4.14 and 4.19 kernels, which should speed up cBPF and eBPF-based packet filtering (tc, iptables) and packet sniffing (libpcap, tcpdump, fwknopd, etc). This has minimal kernel size impact, increasing the size of uImage-lzma (normally ~2 MB on mips_24kc or mips64el_mips64) by 5 KB for the MIPS32 arch cBPF JIT and by 9 KB for the MIPS64 arch eBPF JIT, on kernel 4.14. With JIT enabled (cBPF only), the standard BPF test module (test_bpf.ko) running on a DIR-835 (mips_24kc) used 33 CPU seconds, but 68 without JIT. This change aligns with the notion of OpenWRT as the network go-to swiss army knife for packet handling, especially on CPU-constrained platforms. Signed-off-by: Tony Ambardar --- target/linux/generic/config-4.14 | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'target/linux/generic/config-4.14') diff --git a/target/linux/generic/config-4.14 b/target/linux/generic/config-4.14 index 81214a6942..e90d8bf930 100644 --- a/target/linux/generic/config-4.14 +++ b/target/linux/generic/config-4.14 @@ -594,7 +594,7 @@ CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3 # CONFIG_BOOT_PRINTK_DELAY is not set CONFIG_BOOT_RAW=y CONFIG_BPF=y -# CONFIG_BPF_JIT is not set +CONFIG_BPF_JIT=y # CONFIG_BPF_JIT_ALWAYS_ON is not set # CONFIG_BPF_STREAM_PARSER is not set CONFIG_BPF_SYSCALL=y -- cgit v1.2.3