Aneesh Kumar wrote:
What i am doing for creating a large number of extents is

dd if=/dev/zero of=myfile count=10
seek=20
while [ 1 ]; do dd if=/dev/zero of=myfile count=10 seek=$seek;
seek=`expr $seek + 20`; done

with AGGRESSIVE_TEST defined in include/linux/ext4_fs_extents.h you may
get much more extents and index blocks.



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