Re: [RFC] Cache negative delta pairs

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On Thu, 29 Jun 2006, Linus Torvalds wrote:

> 
> 
> On Thu, 29 Jun 2006, Nicolas Pitre wrote:
> >
> > On Thu, 29 Jun 2006, Linus Torvalds wrote:
> > 
> > > Instead of having a separate cache, wouldn't it be much better to just 
> > > take the hint from the previous pack-file?
> > 
> > DOH!  ;-)
> 
> Btw, I think this could do with a flag to turn it on/off (but probably 
> default to on).

I think it should simply be coupled with the --no-reuse-delta flag.

> The advantage of this patch is that it should guarantee that if everything 
> is already packed, a repack will basically keep the pack identical. 
> 
> However, that is obviously also the dis-advantage, since it means that 
> repacking cannot improve packing. So adding a flag to say "please try to 
> incrementally improve the pack" might well be worth it, even if this new 
> behaviour would be the _default_.

Actually, the delta reusing already prevents those deltas from being 
improved.  So your patch only extend this notion to the non-deltified 
objects as well.  And the way out is to provide the --no-reuse-delta 
flag.


Nicolas
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