netdev - Re: [PATCH net-next] sock: don't enable netstamp for af

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Message-Id: <1445866379.133031.420389177.3AE9E175@webmail.messagingengine.com>
Date:	Mon, 26 Oct 2015 14:32:59 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] sock: don't enable netstamp for af_unix sockets

Hello,

On Mon, Oct 26, 2015, at 14:19, Richard Cochran wrote:
> On Mon, Oct 26, 2015 at 01:51:37PM +0100, Hannes Frederic Sowa wrote:
> > netstamp_needed is toggled for all socket families if they request
> > timestamping. But some protocols don't need the lower-layer timestamping
> > code at all. This patch starts disabling it for af-unix.
> 
> What problem is this patch trying to solve?

netstamp_needed is a static-key which enables timestamping code in the
networking stack receive functions for every packet, while it is not
needed for AF_UNIX/LOCAL. So it is merely a small performance
enhancement.

Bye,
Hannes
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