[rdiff-backup-users] Re: more info on 25gig files

[rsync2eran]

One more thing:

Donovan Baarda wrote:
> My gut feeling is an additionalwhole file hash calculated 
> alongside the blocksum hashes would not be a significant cost...
> particularly compared to the rollsum+hashtable lookups at every byte.

When the files mostly match, "rdiff signature" and "rdiff delta" do
similar things and indeed run almost exactly as fast. So for that case
you can use the benchmarks given earlier to estimate the overhead.

  Eran