Re: [PATCH] ext4: dir inode reservation V3

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hmm. so you trade 265% degradation of creation for 40% improvement of unlink?

thanks, Alex

Coly Li wrote:
			normal ext4			ext4 with dir inode reservation
	mount options:	-o data=writeback		-o data=writeback,dir_ireserve=low
	Create dirs:	real    0m49.101s		real    2m59.703s
	Create files:	real    24m17.962s		real    21m8.161s
	Unlink all:	real    24m43.788s		real    17m29.862s
Creating dirs with dir inode reservation is slower than normal ext4 as predicted, because allocating
directory inodes in non-linear order will cause extra hard disk seeking and block I/O. Creating
files with dir inode reservation is 13% faster than normal ext4. Unlink all the directories and
files is 29.2% faster as expected.
When number of directories is increased, the performance improvement will be more considerable. More
benchmark result will be posted here if necessary, because I need more time to run more test cases.

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