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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: "Phil Yang (Arm Technology China)" <Phil.Yang@arm.com>, "dev@dpdk.org"
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Thread-Topic: [PATCH v3 2/3] test/distributor: replace sync builtins with
 atomic builtins
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Date: Thu, 4 Apr 2019 15:30:05 +0000
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Subject: Re: [dpdk-dev] [PATCH v3 2/3] test/distributor: replace sync
 builtins with atomic builtins
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>=20
> '__sync' built-in functions are deprecated, should use the '__atomic'
> built-in instead. the sync built-in functions are full barriers, while at=
omic
> built-in functions offer less restrictive one-way barriers, which help
> performance.
>=20
> Here is the example test result on TX2:
> sudo ./arm64-armv8a-linuxapp-gcc/app/test -l 112-139 \ -n 4 --socket-
> mem=3D1024,1024 -- -i
> RTE>>distributor_perf_autotest
>=20
> *** distributor_perf_autotest without this patch *** =3D=3D=3D=3D Cache l=
ine switch
> test =3D=3D=3D Time for 33554432 iterations =3D 1519202730 ticks Ticks pe=
r iteration
> =3D 45
>=20
> *** distributor_perf_autotest with this patch *** =3D=3D=3D=3D Cache line=
 switch test
> =3D=3D=3D Time for 33554432 iterations =3D 1251715496 ticks Ticks per ite=
ration =3D 37
>=20
> Less ticks needed for the cache line switch test. It got 17% of performan=
ce
> improvement.
>=20
> Signed-off-by: Phil Yang <phil.yang@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
> Reviewed-by: Joyce Kong <joyce.kong@arm.com>
> Reviewed-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
> ---
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>