From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH] config: make AVX and AVX512 configurable
Date: Thu, 27 Apr 2017 11:08:00 +0200
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Cc: dev@dpdk.org, yuanhan.liu@linux.intel.com
To: Zhihong Wang <zhihong.wang@intel.com>, bruce.richardson@intel.com
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27/04/2017 18:34, Zhihong Wang:
> Making AVX and AVX512 configurable is useful for performance and power
> testing.
> 
> The similar kernel patch at https://patchwork.kernel.org/patch/9618883/.
[...]
> +#
> +# Recognize/ignore the AVX/AVX512 CPU flags for performance/power testing
> +#
> +CONFIG_RTE_ENABLE_AVX=y
> +CONFIG_RTE_ENABLE_AVX512=n

It is disabling AVX512 in default configuration.
Please explain this behaviour change.