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

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Date:	Fri, 14 Nov 2008 09:51:44 +0100
From:	"Olaf van der Spek" <olafvdspek@...il.com>
To:	"J.R. Mauro" <jrm8005@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Unix sockets via TCP on localhost: is TCP slower?

On Fri, Nov 14, 2008 at 1:19 AM, J.R. Mauro <jrm8005@...il.com> wrote:
> 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.

Why would you use windowing, ACKs, flow control and encapsulation on localhost?

I expected the kernel to copy data directly from user-space of the
sending process to a kernel buffer of the receiving process, much like
UNIX sockets.

>> 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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