Messages in this thread | | | Subject | Re: [Ext2-devel] Re: [RFC] extents,delayed allocation,mballoc for ext3 | From | Mingming Cao <> | Date | 14 Apr 2004 10:49:59 -0700 |
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On Wed, 2004-04-14 at 05:10, Alex Tomas wrote: > > I've just benched ext3 vs. ext3+reservation vs. ext3+delalloc vs. xfs. > it was tiobench. > ext3 1024 4096 32 8.12 9.872% 8.111 82 > ext3-dalloc 1024 4096 32 24.83 20.01% 2.995 124 > ext3-reserv 1024 4096 32 22.72 29.51% 3.282 77 > xfs 1024 4096 32 25.47 21.75% 2.247 117 > Hi Alex,
Nice comparison! The ext3 reservation system use more cpus because we do reservations in memory( not on disk) and we have a global lock per filesystem to guard the operation. The current search for a new reservation window algorithm is not perfect right now.
extents and delayed allocation probably is the right way to go for next generation (maybe ext4). Currently I just try to fix the missing preallocation feature in ext3, without break the disk compatibility and involve too much changes....
Thanks for your interest.
Mingming
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