Date: Tue, 8 Feb 2005 15:15:09 +0900 From: "Daikichi Osuga" <osuga@nim.yrp.nttdocomo.co.jp> To: <freebsd-net@freebsd.org> Subject: SACK retransmits multiple segments respond to single dupack Message-ID: <003901c50da5$8a9f7c80$5beb15ac@mig.yrp.nttdocomo.co.jp>
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Hello, I had experiments with FreeBSD SACK implementation. FreeBSD SACK retransmits multiple segments respond to single dupack. It breaks "packet conservation principle". In OpenBSD SACK implementation, retransmission from SACK hole is limited to single segment. "sack_rxmit" and "sendalot" are exclusive. I think solution is introducing mechanism to estimate amount of outstanding segments. For example, "pipe" alogorithm is well known. http://www.icir.org/floyd/talks/sf-sacks-96.pdf Regards, -- Daikichi Osuga
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