diff options
author | Yonghong Song <yhs@fb.com> | 2019-10-21 21:31:19 -0700 |
---|---|---|
committer | Daniel Borkmann <daniel@iogearbox.net> | 2019-10-22 21:13:39 +0200 |
commit | e13a2fe642bd4a42c2b468cdb25ad3aab933d572 (patch) | |
tree | 4bbecfc207dfe37a1d5afebb2ee282e9ef654c50 /tools/bpf/bpftool | |
parent | 46a4a97063a0e9a1725ba33ae5ac5603a979ad06 (diff) |
tools/bpf: Turn on llvm alu32 attribute by default
LLVM alu32 was introduced in LLVM7:
https://reviews.llvm.org/rL325987
https://reviews.llvm.org/rL325989
Experiments showed that in general performance is better with alu32
enabled:
https://lwn.net/Articles/775316/
This patch turns on alu32 with no-flavor test_progs which is tested
most often. The flavor test at no_alu32/test_progs can be used to
test without alu32 enabled. The Makefile check for whether LLVM
supports '-mattr=+alu32 -mcpu=v3' is removed as LLVM7 should be
available for recent distributions and also latest LLVM is preferred
to run BPF selftests.
Note that jmp32 is checked by -mcpu=probe and will be enabled if the
host kernel supports it.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191022043119.2625263-1-yhs@fb.com
Diffstat (limited to 'tools/bpf/bpftool')
0 files changed, 0 insertions, 0 deletions