linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andi Kleen <andi@firstfloor.org>
To: Chris Friesen <cfriesen@nortel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
	Renzo Davoli <renzo@cs.unibo.it>,
	linux-kernel@vger.kernel.org
Subject: Re: New Address Family: Inter Process Networking (IPN)
Date: Fri, 7 Dec 2007 00:06:11 +0100	[thread overview]
Message-ID: <20071206230611.GK20595@one.firstfloor.org> (raw)
In-Reply-To: <47587F90.8010400@nortel.com>

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

  reply	other threads:[~2007-12-06 23:06 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-05 16:40 New Address Family: Inter Process Networking (IPN) Renzo Davoli
2007-12-05 21:55 ` Stephen Hemminger
2007-12-06  5:38   ` Renzo Davoli
2007-12-06  5:43     ` Renzo Davoli
2007-12-06  6:04     ` Stephen Hemminger
2007-12-05 23:39 ` Andi Kleen
2007-12-06  5:30   ` Renzo Davoli
2007-12-06  6:19     ` Kyle Moffett
2007-12-06  6:59       ` David Newall
2007-12-06 16:34         ` Andi Kleen
2007-12-06 22:21           ` David Newall
2007-12-06 22:42             ` Andi Kleen
2007-12-06 16:35     ` Andi Kleen
2007-12-06 20:36       ` Chris Friesen
2007-12-06 21:26         ` Andi Kleen
2007-12-06 21:49           ` Chris Friesen
2007-12-06 22:07             ` Andi Kleen
2007-12-06 22:18               ` Renzo Davoli
2007-12-06 22:38                 ` Andi Kleen
2007-12-07  0:18                   ` Renzo Davoli
2007-12-06 23:02               ` Chris Friesen
2007-12-06 23:06                 ` Andi Kleen [this message]
2007-12-06 23:42                   ` Chris Friesen
2007-12-07  3:41         ` David Miller
2007-12-07  4:21           ` Chris Friesen
2007-12-07  4:54             ` Ben Pfaff
2007-12-07  6:40             ` David Miller
2007-12-07 10:03               ` Andi Kleen
2007-12-07 21:18                 ` AF_IPN: Inter Process Networking, try these Renzo Davoli
2007-12-08  2:07                   ` David Miller
2007-12-10 16:05               ` New Address Family: Inter Process Networking (IPN) Chris Friesen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20071206230611.GK20595@one.firstfloor.org \
    --to=andi@firstfloor.org \
    --cc=cfriesen@nortel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=renzo@cs.unibo.it \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).