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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 13 Nov 2008 20:06:58 +0100
From:	"Olaf van der Spek" <olafvdspek@...il.com>
To:	"Arnaldo Carvalho de Melo" <acme@...hat.com>,
	"Olaf van der Spek" <olafvdspek@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Unix sockets via TCP on localhost: is TCP slower?

On Thu, Nov 13, 2008 at 12:24 PM, Arnaldo Carvalho de Melo
<acme@...hat.com> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/