Re: [PATCH] ext4: dir inode reservation V3

Alex Tomas
2007-11-13T14:23:14Z

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.