diff options
| author |   Jieqiang Wang <jieqiang.wang@arm.com> | 2023-07-04 12:05:33 +0800 |
|---|---|---|
| committer |   Damjan Marion <dmarion@0xa5.net> | 2023-10-01 21:11:32 +0000 |
| commit | bef2d6da4ea5d67647d310a3cca5ede09385cf05 (patch) | |
| tree | 0da214f4f80c74a7efd66f5cb31ffb8c03b2bef3 | |
| parent | e7f34c93b1c928855f88896c5bdd2bc539ee77ae (diff) | |
build: modify N_PREFETCH on Arm N2 to achieve best perf
From GCC 12, march=armv9-a option is supported, which includes the sve
and crc options needed. Furthermore, VPP L3Fwd benchmark results on N2
based servers show that N_PREFETCH set to 6 gives the best performance.
Type: feature
Signed-off-by: Lijian Zhang <Lijian.Zhang@arm.com>
Signed-off-by: Jieqiang Wang <jieqiang.wang@arm.com>
Change-Id: I9c4fcad84d4db1189d956dabab22b26d020fbfd6
| -rw-r--r-- | src/cmake/cpu.cmake | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/cmake/cpu.cmake b/src/cmake/cpu.cmake index f683b62b8f4..18a1210f541 100644 --- a/src/cmake/cpu.cmake +++ b/src/cmake/cpu.cmake @@ -194,10 +194,9 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64.*|AARCH64.*)") N_PREFETCHES 6 CACHE_PREFETCH_BYTES 64 ) - add_vpp_march_variant(neoversen2 - FLAGS -march=armv8.6-a+crc+crypto+sve2 -mtune=neoverse-n2 - N_PREFETCHES 8 + FLAGS -march=armv9-a+crypto -mtune=neoverse-n2 + N_PREFETCHES 6 CACHE_PREFETCH_BYTES 64 OFF ) |