Hi all,
I have launch valerie's performance test to compare ext4 evolution from
kernel 2.6.26-rc2 to kernel 2.6.27-rc1.
Both results are available here :
http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.htm <http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-write-2.6.27-rc1.html>
http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-write-2.6.27-rc1.html
barriers were disabled for this tests.
We could notice significant improvement of number of
extents per file with following cases :
mkfs option : -I 256 -O uninit_groups
mount option : data=writeback, nomballoc
and
mkfs option : -I 256 -O uninit_groups,flex_bg -G 64
mount option : data=writeback, nomballoc
fsck time appears now constant (kernel 2.6.27-rc1).
Cel.