Date: Mon, 16 Oct 2017 05:44:16 +0000
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From: ondrej@isc.org
Subject: Use recvmmsg and sendmmsg where available
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There's a quite big performance gain when using recvmmsg and sendmmsg family of functions where available (Linux >= 3.0 + glibc >= 2.14, FreeBSD >= 11.0).

The code around socket handling might have to be refactored to gain a real benefit though.