Junio C Hamano <gits...@pobox.com> writes:

>> [1] This is all theory, and I don't know how well git actually finds
>>     such deltas, but it is probably better to have a dense tree of
>>     deltas rather than long chains.  If you have a chain of N objects
>>     and would to add object N+1 to it, you are probably not much worse
>>     off to base it on object N-1, creating a "fork" at N.
>
> Yes, your guess is perfectly correct here, and indeed we did an
> extensive work along that line in 2006/2007.  For an example, see
> http://thread.gmane.org/gmane.comp.version-control.git/51949/focus=52003

And here is another, which is probably one of the most important
thread on pack-objects, before the bitmap was introduced:

http://thread.gmane.org/gmane.comp.version-control.git/20056/focus=20134

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