On Tue, 2002-07-23 at 02:33, Georg Lehner wrote: > If the download tool(s) could look at the local package cache or mirror > if an older (not-too old?!?) version exist and rsync the newer version > on top of bandwidth could be saved. This is important at least for us > with low (loooow) bandwidth capacities. At times I have to recurse even > to telefone links for my updates! If the gzip used to compress the files inside the packages had been patched to be rsync friendly, and if we were using that option, then what you say might be true. As it is, a one character change near the start of a compressed file can (and normally does) result in two compressed files with nothing in common that rsync could take advantage of. What makes this worse is that not only is using rsync in this manner mostly pointless, but each connection inflicts significant load on the server, so you end up doing a DDoS on our mirror servers. There is a paper about this by Martin Pool (the new upstream rsync maintainer): http://www.samba.org/cgi-bin/cvsweb/rsyncweb/rsync-and-debian/rsync-and-debian.sgml?rev=1.10&content-type=text/x-cvsweb-markup in which he proposes that we switch to using rsync friendly gzip, and that there be a modified version of rsync which reverses the algorithm, and leaves most of the load on the client. He also points out that this could be done on most modern web servers, on the server side, with either minor, or no modification. It sounds a great idea to me, but it's not happened yet, so until it does, doing this would be stunningly counter-productive, I'm afraid. Cheers, Phil. > > Of course this is not jigdo-functionality but debian-package and version > administration functionality and maybe has to be handled "outside" of > jigdo. > > Best Regards, > > Jorge-León > > > -- > To UNSUBSCRIBE, email to debian-cd-request@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmaster@lists.debian.org > -- Say no to software patents! http://petition.eurolinux.org/ |)| Philip Hands [+44 (0)20 8530 9560] http://www.hands.com/ |-| HANDS.COM Ltd. http://www.uk.debian.org/ |(| 10 Onslow Gardens, South Woodford, London E18 1NE ENGLAND
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