On Wed, Sep 19, 2007 at 05:07:15PM +0200, Jan Kara wrote: > > I was just wondering: Currently we start to build h-tree in a directory > already when the size of directory exceeds one block. But honestly, it does > not seem to make much sence to use this feature until the directory is much > larger (I'd say at least 16 or 32 KB). It actually slows down some > operations like deleting the whole directory, etc. So what is the reason > for starting building the tree so early? Just the simplicity of building it > when the directory is just one block large? How much is it slowing down operations such as rm -rf? For a small directory (< 32k), I would assume that the difference would be relatively small. What sort of differences have you measured, and is this a common case problem? Certainly one of the things that we could consider is for small directories to do an in-memory sort of all of the directory entries at opendir() time, and keeping that list until it is closed. We can't do this for really big directories, but we could easily do it for directories under 32k or 64k. - Ted - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
