Date: Wed, 12 Mar 2003 14:16:04 -0800 From: Jayanth Vijayaraghavan <jayanth@elvis.mu.org> To: Hiten Pandya <hiten@unixdaemons.com> Cc: Jeffrey Hsu <hsu@FreeBSD.ORG>, src-committers@FreeBSD.ORG, cvs-src@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/netinet tcp_input.c Message-ID: <20030312221604.GA997@elvis.mu.org> In-Reply-To: <20030312210107.GA56887@unixdaemons.com> References: <200303122027.h2CKRSwR026081@repoman.freebsd.org> <20030312210107.GA56887@unixdaemons.com>
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On Wed, Mar 12, 2003 at 04:01:07PM -0500, Hiten Pandya wrote: > Jeffrey Hsu (Wed, Mar 12, 2003 at 12:27:28PM -0800) wrote: > > hsu 2003/03/12 12:27:28 PST > > > > FreeBSD src repository > > > > Modified files: > > sys/netinet tcp_input.c > > Log: > > Implement the Limited Transmit algorithm (RFC 3042). > > Can you elaborate on this? > > -- Hiten One of the main uses of the algorithm is when the congestion window is small by sending new data for every duplicate acknowledgement you end up forcing the other end to send another duplicate ack. This way you can retransmit the lost segment quickly (fast retransmit). If you did not have the this algorithm and have a small congestion window you could end up with only 2 duplicate acknowledgements rather than 3. This could have the adverse effect of forcing a retransmit timeout rather than a fast retransmit. jayanth To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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