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From: Andy Furniss <andy.furniss@dsl.pipex.com>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] TCP window based shaping
Date: Tue, 15 Feb 2005 22:54:30 +0000	[thread overview]
Message-ID: <42127DA6.5020906@dsl.pipex.com> (raw)
In-Reply-To: <42095013.8030600@wildgooses.com>

marco ghidinelli wrote:

> note that drop means 'losing correct data already received'. so when we
> drop, we need a retransmission, so we are wasting bandwidth. 
> 

Yea - it's a pain, but then you can't rely on anywhere else to do it 
apart from your ISP/Teleco - who will fill a big buffer first.

You still loose the bandwidth of the retransmit - I loose the drop 
aswell, but then I have to back off X% anyway and the drop sort of comes 
out of that.

> btw, simulate a drop is easy just send two (or three - it depends on the
> implementation of the tcp stack) duplicate ack that means: we have received
> out of order packet so please retransmit.

Do you have to do do it differently for servers that do sacks, or do 
they still react to DUPs ?

Andy.



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  parent reply	other threads:[~2005-02-15 22:54 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-02-08 23:49 [LARTC] TCP window based shaping Ed Wildgoose
2005-02-08 23:57 ` David Boreham
2005-02-09  1:59 ` Andy Furniss
2005-02-09 11:34 ` marco ghidinelli
2005-02-09 22:38 ` Andy Furniss
2005-02-11  2:57 ` Ed Wildgoose
2005-02-11 11:05 ` marco ghidinelli
2005-02-11 18:18 ` Ed Wildgoose
2005-02-11 23:45 ` Ed Wildgoose
2005-02-12  2:16 ` Andy Furniss
2005-02-12 13:19 ` Andy Furniss
2005-02-13  0:46 ` Ed Wildgoose
2005-02-14  0:27 ` marco ghidinelli
2005-02-14  0:38 ` marco ghidinelli
2005-02-15 22:33 ` Andy Furniss
2005-02-15 22:54 ` Andy Furniss [this message]
2005-02-16 14:52 ` Ed Wildgoose
2005-02-17  3:45 ` gypsy
2005-02-17 14:09 ` Ed Wildgoose
2005-03-12 10:10 ` Ow Mun Heng
2005-03-15 15:24 ` Ed Wildgoose
2005-03-16  7:46 ` Ow Mun Heng
2005-07-09  4:01 ` Don Cohen
2005-07-10 19:55 ` Andy Furniss
2005-07-12  1:50 ` TAKANO Ryousei
2005-07-12  8:46 ` Andy Furniss
2005-07-12 13:44 ` TAKANO Ryousei

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