linux-kernel - Re: Unix sockets via TCP on localhost: is TCP slower?

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Date:	Thu, 13 Nov 2008 19:19:36 -0500
From:	"J.R. Mauro" <jrm8005@...il.com>
To:	"Olaf van der Spek" <olafvdspek@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Unix sockets via TCP on localhost: is TCP slower?

On Wed, Nov 12, 2008 at 6:20 PM, Olaf van der Spek <olafvdspek@...il.com> wrote:
> Hi,
>
> Quite often in discussions, I see people claiming Unix sockets are
> faster then TCP sockets on a connection that stays inside localhost.

Unix domain sockets should be faster because they're not subject to
windowing, ACKs, flow control, encapsulation, etc. etc.

> Let's say from app A to app B.
> Is this indeed the case and if so, how much and why?
> My assumption is that the kernel can optimize the 'connection' and let
> any performance differences disappear.
>
> Greetings,
>
> Olaf
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