linux-ext4 - Re: [PATCH] ext4: dir inode reservation V3

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Date:	Tue, 13 Nov 2007 17:09:46 +0300
From:	Alex Tomas <bzzz.tomas@...il.com>
To:	coyli@...e.de
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: dir inode reservation V3

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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