linux-kernel - Re: New Address Family: Inter Process Networking (IPN)

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Message-ID: <20071206230611.GK20595@one.firstfloor.org>
Date:	Fri, 7 Dec 2007 00:06:11 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Renzo Davoli <renzo@...unibo.it>,
	linux-kernel@...r.kernel.org
Subject: Re: New Address Family: Inter Process Networking (IPN)

On Thu, Dec 06, 2007 at 05:02:40PM -0600, Chris Friesen wrote:
> Andi Kleen wrote:
> 
> >>On a 1.4GHz P4 I measured a 44% increase in latency between a unix 
> >>datagram and a UDP datagram.
> 
> >That's weird.
> 
> I just reran on a 3.2GHZ P4 running 2.6.11 (Fedora Core 4).  42% latency 
> increase.

Sounds like something that should be looked into. I know of no
principal reasons for that.

> For stream sockets, unix gives approximately a 62% bandwidth increase 
> over tcp.   (Although tcp could probably be tuned to do better than this.)

How long a stream did you test? You might be measuring slow start.

-Andi
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