RE: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt

["Jozef Babiarz" <[e-mail]>]

Hi Phil, just to add to what Michael wrote, there is no requirement for
"s" to be the same value within a domain. We have done simulations with
several different values and the "s" parameter controls how aggressively
overload condition is removed. In our simulations, we have used the
following formula to calculate a value for s for voice traffic; IP data
rate of a flow (G.711 codec) x RTT (total route trip delay ingress to
egress) x 2 = s.
As Michael indicated we still need to do a bit more work to provide
guideless on a range of values for s that would be good to use in a
single domain, and multi domains. 

Regards, Joe
email:[e-mail]
Telephone:[phone]
-----Original Message-----
From: Michael Menth [mailto:[e-mail]] 
Sent: July 19, 2007 12:19 PM
To: [e-mail]
Cc: Babiarz, Jozef (CAR:0S03); [e-mail]
Subject: Re: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt

Hi Phil,

we do not require the slowdown parameter "s" to be the same for all 
links, but I currently cannot think of a case where it would be of a 
benefit when different values are used. It controls the aggressiveness 
of the marking and termination, therefore, it could be useful to have it

different for different links. Maybe simulations will show ...?

Regards,

    Michael

[e-mail] wrote:
> Joe
>
> Your draft has the slow-down parameter "s" (when ET-marking ==
> termination-marking, measure the excess traffic rate and actually mark
a
> fraction (1/s) of this rate).
>
> Does "s" have to be the same on all routers in the PCN-domain? I'm not
> sure this is a requirement, but what would happen if the "s" parameter
> was different? 
>
> Thanks
> Phil/ 
>
>   
>> -----Original Message-----
>> From: Jozef Babiarz [mailto:[e-mail]]
>> Sent: 03 July 2007 18:18
>> To: [e-mail]
>> Subject: [PCN] FW: I-D ACTION:draft-babiarz-pcn-3sm-00.txt
>>
>> Hi all,
>> In an email below there is a link to 00 version of pcn-3sm draft that
>> defines metering and marking for admission control and flow
>>     
> termination.
>   
>> We call it three state PCN marking because there are three
conditions,
>> packets are not marked, packets marked to indicate that admission of
>> additional flows should be stopped and finally condition where flows
>>     
> are
>   
>> marked to indicate that termination is needed. This draft
incorporates
>> the metering and marking approach for flow termination that was
>>     
> defined
>   
>> in draft-babiarz-pcn-explicit-marking-00.
>>
>> Simulation results for the proposed "AR-metering and AS-re-marking"
>>     
> and
>   
>> "SR-metering and ET-re-marking" will be published in a separate
draft.
>>
>> Regards, Joe
>> email:[e-mail]
>> Telephone:[phone]
>> -----Original Message-----
>> From: [e-mail] [mailto:[e-mail]]
>> Sent: July 3, 2007 11:15 AM
>> To: [e-mail]
>> Subject: I-D ACTION:draft-babiarz-pcn-3sm-00.txt
>>
>> A New Internet-Draft is available from the on-line Internet-Drafts
>> directories.
>>
>>
>> 	Title		: Three State PCN Marking
>> 	Author(s)	: J. Babiarz, et al.
>> 	Filename	: draft-babiarz-pcn-3sm-00.txt
>> 	Pages		: 24
>> 	Date		: 2007-7-3
>>
>>    This document proposes metering and marking mechanisms for PCN-
>>    enabled nodes to label packets with pre-congestion information.
>>     
> The
>   
>>    marker marks all PCN packets with an admission-stop (AS) codepoint
>>     
> if
>   
>>    the PCN traffic rate on a link exceeds its admissible rate (AR)
and
>>    when it exceeds its supportable rate (SR), it marks some of those
>>    packets exceeding SR with an excess-traffic (ET) codepoint.  The
>>    flows with ET-marked packets will be terminated until the
aggregate
>>    PCN traffic on the path decreases below its SR.  This document
>>    proposes metering and marking mechanisms for these objectives.
>>
>>
>> A URL for this Internet-Draft is:
>> http://www.ietf.org/internet-drafts/draft-babiarz-pcn-3sm-00.txt
>>
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-- 
Dr. Michael Menth, Assistant Professor
University of Wuerzburg, Institute of Computer Science
Am Hubland, D-97074 Wuerzburg, Germany, room B206
phone: [phone], fax: [phone]
mailto:[e-mail]
http://www3.informatik.uni-wuerzburg.de/research/ngn



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