Messages in this thread | | | Date | Tue, 13 Nov 2007 17:09:46 +0300 | From | Alex Tomas <> | Subject | 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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