Re: [Ext2-devel] [rfc] Near-constant time directory index for Ext2

tytso
2001-02-22T13:20:36Z

From: Daniel Phillips <phillips@innominate.de>
Date: Thu, 22 Feb 2001 08:24:08 +0100
Content-Type: text/plain

> Is it worth it? Well, it means you lose an index entry from each
> directory block, thus reducing your fanout at each node of the tree by a
> worse case of 0.7% in the worst case (1k blocksize) and 0.2% if you're
> using 4k blocksizes.

I'll leave that up to somebody else - we now have two alternatives, the
100%, no-compromise INCOMPAT solution, and the slightly-bruised but
still largely intact forward compatible solution. I'll maintain both
solutions for now code so it's just as easy to choose either in the end.

Well, the $64,000 question is exactly how much performance does it cost?
My guess is that it will be barely measurable, but only benchmarks will
answer that question.

- Ted