ext4/reiser3/btr directory create/read perf

[wbrana]

Hello,

I executed benchmark which creates and reads 10000 directories.
It is much slower with ext4 than with reiser3 or btrfs.

ext4 without dir_index
void cfs::vdirs_create(): 7754 msec
void cfs::vdirs_read(): 3363 msec

reiser3
void cfs::vdirs_create(): 1173 msec
void cfs::vdirs_read(): 421 msec

btrfs
void cfs::vdirs_create(): 1331 msec
void cfs::vdirs_read(): 567 msec

MD RAID10-f2, 64 kB chunk size

Source code:
http://www.sendspace.com/file/bconaa
depends on Qt Core, has hard-coded paths
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