Re: Updated ext4/jbd2 patches based on 2.6.19-rc1

Andrew Morton
2006-10-06T06:11:02Z

On Thu, 5 Oct 2006 23:58:29 -0600
Andreas Dilger <adilger@clusterfs.com> wrote:

> but the patches have not been changed for ext4 (which should really
> default to using extents on a filesystem with the INCOMPAT_EXTENT feature
> set unless told otherwise). That is a necessity for filesystems larger
> than 2^32 blocks, since there is no way to create old block-mapped files
> past that limit.

That's news to me. So we only use 48-bit block numbers for extents and
not for old-style indirect blocks?

How much performance improvement do they get, btw? CPU or IO? I'm not noticing
any difference.

Has been a while since I did any fs testing. Boy, ext3 is beating the crap
out of ext2 for quality of file layout.