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

[Olaf van der Spek]

On Thu, Nov 13, 2008 at 12:24 PM, Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
> Em Thu, Nov 13, 2008 at 12:20:44AM +0100, Olaf van der Spek escreveu:
>> Hi,
>>
>> Quite often in discussions, I see people claiming Unix sockets are
>> faster then TCP sockets on a connection that stays inside localhost.
>> 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.
>
> How much? Please measure.

I can't be the first one to wonder about this. Has nobody done this
kind of benchmark before?

> Faster? Not necessarily, Nagle comes to mind,

Eh, wouldn't that make TCP slower instead of faster?

> among others. What kind of traffic? That matters too.
>
> Start here: http://en.wikipedia.org/wiki/Nagle's_algorithm

Eh, I assume that algorithm is disabled on localhost.
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