--- On Tue, 21/4/09, Andre Robatino <andre@xxxxxxxxxxxxxxx> wrote: > From: Andre Robatino <andre@xxxxxxxxxxxxxxx> > Subject: Re: Can we have a Delta-DVD release > To: fedora-devel-list@xxxxxxxxxx > Date: Tuesday, 21 April, 2009, 9:05 PM > > So there is! Doesn't work on F9 > -> F10 but on F10 -> F11 beta DVD (x86_64) > > I get a delta iso image of 2.2GB, about 53% less than > the full iso. > > Hmm, not as good as I was expecting, probably not > worth making a fuss > about unless we could get <1GB. > > A lot of people would probably be very happy with cutting > the download in half. On a 768 Kbit/s connection it > would reduce download time from about 12 hours to six. > If the tool doesn't take too long to do the reconstruction > after downloading, and if it's reliable (so one doesn't have > to download 2GB only to find out it doesn't work, then > download the full 4GB anyway) the deltaiso should be > available as a download option. > > -----Inline Attachment Follows----- > > -- > fedora-devel-list mailing list > fedora-devel-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/fedora-devel-list The bad news is the reconstruction is quite slow, ~40 mins on a 2GHz Core 2 Duo, 2GB ram. Here are the full stats, for the delta between F10 final and F11 beta DVD x86_64: ls -lh Fedora-11-Beta-x86_64-DVD.iso -rw-rw-r-- 1 user user 4.1G 2009-04-21 17:25 Fedora-11-Beta-x86_64-DVD.iso makedelta iso Fedora-10-x86_64-DVD.iso Fedora-11-Beta-x86_64-DVD.iso F10_F11_delta.iso ls -lh F10_F11_delta.iso -rw-rw-r-- 1 user user 2.2G 2009-04-21 19:33 F10_F11_delta.iso (53% of the size of the full F11 dvd) time applydeltaiso Fedora-10-x86_64-DVD.iso F10_F11_delta.iso F11_reconstructed.iso ... iso sucessfully re-created, md5sum: 9dc917523132a3d269c59c91b647525a real 41m8.534s user 37m53.129s sys 0m34.155s ls -lh F11_reconstructed.iso -rw-rw-r-- 1 user user 4.1G 2009-04-21 22:45 F11_reconstructed.iso md5sum Fedora-11-Beta-x86_64-DVD.iso 9dc917523132a3d269c59c91b647525a So, the delta iso image is ~half the size of the full iso, and it takes ~40 mins to reconstruct the full iso (on a 2GHz core2 Duo, 2GB Ram). Now a question for anyone: does the F11 beta release contain lots of debug code and if so would you expect the final dvd to have a smaller delta iso? And one further point: wouldn't this be particularly useful for successive test releases, alphas, beta, release-candidates, since the deltas would be tiny. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
