2008-08-18 12:01:24

by Celine Bourde

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Subject: Ext4 test results

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>

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


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).