linux-ext4 - Re: [PATCH 1/3] libext2fs: ext2fs_node

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Message-ID: <20080517232043.GF16496@mit.edu>
Date:	Sat, 17 May 2008 19:20:43 -0400
From:	Theodore Tso <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3] libext2fs: ext2fs_node_split

> +	/* splitting root level means moving them all out */
> +	if (handle->level == 0) {
> +		new_root = 1;
> +		tocopy = ext2fs_le16_to_cpu(eh->eh_entries);
> +	} else {
> +		tocopy = ext2fs_le16_to_cpu(eh->eh_entries) / 2;
> +	}

This is probably in the "would be nice" category, but if we know that
we are appending to the file, it might actually be better to move all
of the entries into one block, and create an empty block to the right.
That way, the average density of the leaf nodes will be much closer to
100%, instead of 50% full.

This optimization is far more important in the kernel, though.

     		     	      		       - Ted
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