Re: Unix sockets via TCP on localhost: is TCP slower?

[Olaf van der Spek]

On Fri, Nov 14, 2008 at 1:19 AM, J.R. Mauro <jrm8005@xxxxxxxxx> wrote:
> On Wed, Nov 12, 2008 at 6:20 PM, Olaf van der Spek <olafvdspek@xxxxxxxxx> 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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