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From: Thomas Monjalon <thomas@monjalon.net>
To: "Richardson, Bruce" <bruce.richardson@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	"Tu, Lijuan" <lijuan.tu@intel.com>,
	"Han, YingyaX" <yingyax.han@intel.com>
Subject: Re: [dpdk-dev] [PATCH] build: fix memcpy behaviour regression
Date: Sat, 17 Oct 2020 12:32:05 +0200
Message-ID: <43323638.tEsgfM6REM@thomas> (raw)
In-Reply-To: <BN7PR11MB2818081DFB311E8E8DEAE86AFF030@BN7PR11MB2818.namprd11.prod.outlook.com>

> From: Richardson, Bruce <bruce.richardson@intel.com> 
> When testing on some x86 platforms, code compiled with meson was observed running at a different power-license level to that compiled with make. This is due to the fact that meson auto-detects the instruction sets available on the system and enabled AVX512 rte_memcpy when AVX512 was available, while on make, a build time AVX-512 flag needed to be explicitly set to enable that AVX512 rte_memcpy code path.
> In the absense of runtime path selection for rte_memcpy - which is complicated by it being a static inline function in a header file - we can fix this behaviour regression by similarly having a build-time option which must be set to enable the AVX-512 memcpy path.
> Tested-by: Han, Yingya <yingyax.han@intel.com>

Applied, thanks

      reply	other threads:[~2020-10-17 10:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 14:51 Bruce Richardson
2020-10-16  2:13 ` Han, YingyaX
2020-10-17 10:32   ` Thomas Monjalon [this message]

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