Comment 2 for bug 562666

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Michael Hudson wrote:
> Public bug reported:
>
> Because 2a fetch validates and filters the data it transfers, it is uses
> a lot of cpu -- for example, fetching an imported kernel (over a high
> bandwidth low latency link) uses about an hour of cpu time. git does it
> in about 20 seconds.
>
> There are reasons for done the validation and filtering, but perhaps
> there's a place for a dumb copy? I think Something Needs To Be Done, in
> any case.
>
> ** Affects: bzr
> Importance: Undecided
> Status: New
>

Note that moreso than just validating the data, it is probably
triggering the 'repack-on-the-fly' code, and extracting everything
(should be fairly cheap) and re-compressing it (generally pretty expensive).

This could also be improved using fetch_order='unordered' and weakening
the 'needs-repacking' check.

John
=:->
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