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improve depth heuristic for maximum delta size
This provides a linear decrement on the penalty related to delta depth instead of being an 1/x function. With this another 5% reduction is observed on packs for both the GIT repo and the Linux kernel repo, as well as fixing a pack size regression in another sample repo I have. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -1037,9 +1037,12 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
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if (src_entry->depth >= max_depth)
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return 0;
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/* Now some size filtering euristics. */
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/* Now some size filtering heuristics. */
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size = trg_entry->size;
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max_size = (size/2 - 20) / (src_entry->depth + 1);
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max_size = size/2 - 20;
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max_size = max_size * (max_depth - src_entry->depth) / max_depth;
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if (max_size == 0)
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return 0;
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if (trg_entry->delta && trg_entry->delta_size <= max_size)
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max_size = trg_entry->delta_size-1;
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src_size = src_entry->size;
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