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Date:	Thu, 10 Apr 2014 11:32:25 -0700
From:	Eric Dumazet <>
To:	Edward Cree <>
Cc:, Shawn Bohrer <>,
	Shawn Bohrer <>,
	Jonathan Cooper <>
Subject: Re: [RFC PATCH] udp: allow busy_poll on some unconnected sockets

On Thu, 2014-04-10 at 19:04 +0100, Edward Cree wrote:

> Tested by setting IFF_SINGLE_NAPI in sfc; a UDP ping-pong test showed a
>  performance benefit from sysctl net.core.busy_{read,poll}=50 in both the
>  connected and unconnected case, where previously it only saw the benefit
>  when the socket had been connected.

Right, but how often do we have single NAPI devices on hosts wanting
very low latencies ?

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