Date: Mon, 02 Oct 2000 07:37:17 -0700 From: Julian Elischer <julian@elischer.org> To: Luigi Rizzo <luigi@info.iet.unipi.it> Cc: net@FreeBSD.ORG Subject: Re: SACK in FreeBSD TCP. Message-ID: <39D89D9D.5BB9508C@elischer.org> References: <200010021353.PAA47114@info.iet.unipi.it>
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Luigi Rizzo wrote: > > > 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 great.. I'll look at that.. Julian > 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 -- __--_|\ Julian Elischer / \ julian@elischer.org ( OZ ) World tour 2000 ---> X_.---._/ presently in: Perth v To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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