Re: [ssm] IPv6 Multicast Throughput problems in 802.11

Toerless Eckert <eckert@cisco.com> Tue, 15 November 2005 15:17 UTC

Received: from localhost.cnri.reston.va.us ([127.0.0.1] helo=megatron.ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Ec2YX-0003pl-2v; Tue, 15 Nov 2005 10:17:09 -0500
Received: from odin.ietf.org ([132.151.1.176] helo=ietf.org) by megatron.ietf.org with esmtp (Exim 4.32) id 1Ec2YW-0003pe-6C for ssm@megatron.ietf.org; Tue, 15 Nov 2005 10:17:08 -0500
Received: from ietf-mx.ietf.org (ietf-mx [132.151.6.1]) by ietf.org (8.9.1a/8.9.1a) with ESMTP id KAA29908 for <ssm@ietf.org>; Tue, 15 Nov 2005 10:16:35 -0500 (EST)
Received: from sj-iport-1-in.cisco.com ([171.71.176.70] helo=sj-iport-1.cisco.com) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1Ec2pl-0007TX-5t for ssm@ietf.org; Tue, 15 Nov 2005 10:34:58 -0500
Received: from sj-core-1.cisco.com ([171.71.177.237]) by sj-iport-1.cisco.com with ESMTP; 15 Nov 2005 07:16:58 -0800
X-IronPort-AV: i="3.97,333,1125903600"; d="scan'208"; a="675075980:sNHT1244517302"
Received: from cisco.com (cypher.cisco.com [171.69.11.142]) by sj-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id jAFFGtQe013454; Tue, 15 Nov 2005 07:16:56 -0800 (PST)
Received: (from eckert@localhost) by cisco.com (8.8.8-Cisco List Logging/8.8.8) id HAA00228; Tue, 15 Nov 2005 07:16:55 -0800 (PST)
Date: Tue, 15 Nov 2005 07:16:55 -0800
From: Toerless Eckert <eckert@cisco.com>
To: Tiago Sousa <tmas@dei.uc.pt>
Subject: Re: [ssm] IPv6 Multicast Throughput problems in 802.11
Message-ID: <20051115151655.GL19539@cisco.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
User-Agent: Mutt/1.4i
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 21c69d3cfc2dd19218717dbe1d974352
Cc: ssm@ietf.org
X-BeenThere: ssm@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Source-Specific Multicast <ssm.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/ssm>, <mailto:ssm-request@ietf.org?subject=unsubscribe>
List-Post: <mailto:ssm@ietf.org>
List-Help: <mailto:ssm-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/ssm>, <mailto:ssm-request@ietf.org?subject=subscribe>
Sender: ssm-bounces@ietf.org
Errors-To: ssm-bounces@ietf.org

What packet size do you use ?

There's also a configuratin on access-points for how much bandwidth
multicast (aka: broadcast) can use. That's often tuned down to a very low 
default value.

I've used successfully multiple megabits across 802.11b, not sure
what your problem is...

On Tue, Nov 15, 2005 at 02:26:04AM -0000, Tiago Sousa wrote:
> Hello to all
> 
>  
> 
> I am testing the PIM-SSM daemon (both freebsd and linux) and mrd6 (another
> IPv6 multicast routing daemon) in a wireless link. 
> 
> The problem I encountered with both pim6sd daemon and mrd6 is that I'm
> sending multicast traffic at 4 Mbps and the throughput in the mobile node
> (which is very near from de access point) rounds 40 kbps.
> 
> I am using the mad-flute tool to send the multicast SSM traffic and the
> tcpdump plus trpr to analyze the data. I have also used IxChariot and the
> results are the same.
> 
>  
> 
> Anyone knows why the throughput decreases so much in the wireless link?
> (The multicast TTL is well defined, I have experimented with several
> pci/pcmcia cards and drivers and several access points configurations
> (different channels and rates (801.11b and 802.11g)). The results are remain
> always the same).
> 
>  
> 
> I would appreciate any help/hint that helps me to explain these results.
> 
>  
> 
> Thanks.
> 
>  
> 
> Tiago Sousa

_______________________________________________
ssm mailing list
ssm@ietf.org
https://www1.ietf.org/mailman/listinfo/ssm