Messages in this thread | | | Subject | Re: [Ext2-devel] [rfc] Near-constant time directory index for Ext2 | From | tytso@valinux ... | Date | Thu, 22 Feb 2001 05:20:10 -0800 |
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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.
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