Date: Mon, 2 Oct 2000 15:53:30 +0200 (CEST) From: Luigi Rizzo <luigi@info.iet.unipi.it> To: Julian Elischer <julian@elischer.org> Cc: net@FreeBSD.ORG Subject: Re: SACK in FreeBSD TCP. Message-ID: <200010021353.PAA47114@info.iet.unipi.it> In-Reply-To: <Pine.BSF.4.10.10010020644350.36257-100000@InterJet.elischer.org> from Julian Elischer at "Oct 2, 2000 06:48:53 am"
next in thread | previous in thread | raw e-mail | index | archive | help
> Is anyone working on a SACK (Selective acknowlegement) implementation > for FreeBSD? > > (rfc 2018) > > It would make a huge difference to performance out here at the edge of the > univertse (Perth, Western Australia) I wonder if the "huge difference" is for real or just a myth. When i did some work on sack back in 1996 (including a FreeBSD implementation, see http://www.iet.unipi.it/~luigi/sack.html I did not find that SACK to be such a panacea. Basically, most connections under high loss still had a tendency to stall because the window would never open enough to have 3dupacks which would trigger a retransmission... cheers luigi -----------------------------------+------------------------------------- Luigi RIZZO, luigi@iet.unipi.it . Dip. di Ing. dell'Informazione http://www.iet.unipi.it/~luigi/ . Universita` di Pisa TEL/FAX: +39-050-568.533/522 . via Diotisalvi 2, 56126 PISA (Italy) Mobile +39-347-0373137 -----------------------------------+------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200010021353.PAA47114>