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Sat, 20 Jan 2007

Why is kernel.org so slow some tims (LWN.net article).


Here is an article about problems with filesystem access kernel.org started to face recently which ended with the fact that Linux does not scale too good when number of directory reads becomes too high. Another part of the problem is the fact, that ext3 (current kernel.org fs) does not group directories close to each other to reduce number of seeks needed to read several subdirectories, but it was pointed that for example XFS does have some methods to group directory information close to each other on disc. Another problem is absence of readahead for directories.

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