From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Date: Tue, 15 Feb 2005 22:54:30 +0000 Subject: Re: [LARTC] TCP window based shaping Message-Id: <42127DA6.5020906@dsl.pipex.com> List-Id: References: <42095013.8030600@wildgooses.com> In-Reply-To: <42095013.8030600@wildgooses.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org 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. _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/