Re: [Ext2-devel] [PATCH] distributed counters for ext2 to avoid group scaning

[Alex Tomas]

>>>>> Matthew Wilcox (MW) writes:
 MW> And then we have 3 of these (an additional 3k..).  Per
 MW> blockgroup.  My 4GB / has 30 blockgroups; my 30GB /home has 232.
 MW> So that's a little under 8 per GB.  My _laptop_ has a 40GB drive,
 MW> so that's on the order of 320 blockgroups -- almost an additional
 MW> megabyte of ram consumed for these counters.

no-no!

_one_ dcounter to maintain number of free blocks _per_ fs.
_one_ dcounter to maintain number of inode blocks _per_ fs.
_one_ dcounter to maintain number of dirs _per_ fs.

3 dcounter per fs. no more.