ExternalVendorCode/openwrt
1
0
Fork 0
mirror of https://github.com/openwrt/openwrt.git synced 2024-12-19 05:38:00 +00:00
Code Issues Actions 4 Packages Projects Releases Wiki Activity

kernel: enable CONFIG_BPF_JIT by default

Browse Source 
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 <itugrok@yahoo.com>
This commit is contained in:
Tony Ambardar 2018-12-17 21:29:33 -08:00 committed by Kevin Darbyshire-Bryant
parent ebcd5226cc
commit a7370b5179
3 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
target/linux/generic/config-4.14
View File

@ -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

2
target/linux/generic/config-4.19
View File

@ -614,7 +614,7 @@ CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
CONFIG_BOOT_RAW=y
CONFIG_BPF=y
# CONFIG_BPFILTER is not set
# 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

2
target/linux/generic/config-4.9
View File

@ -566,7 +566,7 @@ 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_SYSCALL=y
# CONFIG_BPQETHER is not set
CONFIG_BQL=y