GSoC - Some questions on the idea of "Better big-file support".

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Hi, Everyone. This is Bo Chen. I am interested in the idea of "Better
big-file support".

As it is described in the idea page,
"Many large files (like media) do not delta very well. However, some
do (like VM disk images). Git could split large objects into smaller
chunks, similar to bup, and find deltas between these much more
manageable chunks. There are some preliminary patches in this
direction, but they are in need of review and expansion."

Can anyone elaborate a little bit why many large files do not delta
very well? Is it a general problem or a specific problem just for Git?
I am really new to Git, can anyone give me some hints on which source
codes I should read to learn more about the current code on delta
operation? It is said that "there are some preliminary patches in this
direction", where can I find these patches?

I will appreciate it if anyone can offer some help.

Thanks.

Bo Chen
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