Re: [LARTC] TCP window based shaping

[Andy Furniss <andy.furniss@dsl.pipex.com>]

marco ghidinelli wrote:
> On Tue, Feb 08, 2005 at 11:49:39PM +0000, Ed Wildgoose wrote:
> 
>>Does anyone have any pointers on how other people have implemented tcp 
>>window adjustment to do bandwidth shaping?
>>
>>Granted the basic idea is to set the window size to be RTT * bandwidth, 
>>but a quick squiz at google turns up mostly papers on how to implement 
>>this at the sender end with a view to some new magic TCP 
>>implementation.  I'm really interested in notes on how to implement at 
>>the router side, perhaps with a view to writing a new QOS module.
>>
>>Biggest issue I can see right now is an architecture one, ie monitoring 
>>the incoming packet rate and then applying that to the outgoing ACK 
>>packets.
> 
> 
> instead of shaping the incoming traffic and estimate rate from the
> outgoing traffic, you can 'delay' the outgoing ACK, and estimate the rate
> from the raise of the sequence number.
> 
> so you just shape on the outgoing queue, without take care of the
> incoming traffic.
> 
> note that everything here is patented, so if you must have lawyers, if
> you want to develop..
> 
> :-/
> 
> http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2Fsearch-bool.html&r=0&f=S&lP&TERM1=packeteer&FIELD1=&co1=AND&TERM2=&FIELD2=&d=ptxt
> 

Ewwww thats not nice - not that I know what those would stop you being 
able to do.

I presume they just apply in the USA and wouldn't be enforcable in 
Europe yet as software patents are not allowed (yet)?

Andy.




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