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build: modify N_PREFETCH on Arm N2 to achieve best perf

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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
This commit is contained in:
Jieqiang Wang
2023-07-04 12:05:33 +08:00
committed by Damjan Marion
parent e7f34c93b1
commit bef2d6da4e
1 changed files with 2 additions and 3 deletions
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5
src/cmake/cpu.cmake
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@@ -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
)