On Wed, 13 Apr 2005 21:19:48 -0700, H. Peter Anvin wrote:

> Checking out the total kernel tree (time checkout-cache -a into an empty 
> directory):
>         Cache cold      Cache hot
> stock   3:46.95         19.95
> base64  5:56.20         23.74
> flat    2:44.13         15.68
> It seems that the flat format, at least on ext3 with dircache, is 
> actually a major performance win, and that the second level loses quite 
> a bit.

Since 160-bits does not go into base64 evenly anyways, what happens if
you use 2^10 instead of 2^12 for the subdir names?  That will be 1/4 the
directories of the base64 given above.


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