Re: [RFC] extents,delayed allocation,mballoc for ext3

[Alex Tomas]

I've just benched ext3 vs. ext3+reservation vs. ext3+delalloc vs. xfs.
it was tiobench.

Sequential Writes
                              File  Blk   Num                   Avg     CPU
Identifier                    Size  Size  Thr   Rate  (CPU%)  Latency   Eff
---------------------------- ------ ----- ---  ------ ------ --------- -----
ext3                          1024  4096    4   13.34 14.76%     0.897    90
ext3-dalloc                   1024  4096    4   26.39 19.26%     0.452   137
ext3-reserv                   1024  4096    4   23.77 28.99%     0.529    82
xfs                           1024  4096    4   27.22 20.68%     0.373   132

ext3                          1024  4096    8    9.71 10.82%     2.421    90
ext3-dalloc                   1024  4096    8   25.81 18.64%     0.816   138
ext3-reserv                   1024  4096    8   23.62 29.49%     1.006    80
xfs                           1024  4096    8   27.06 22.49%     0.763   120

ext3                          1024  4096   16    6.60 7.891%     7.222    84
ext3-dalloc                   1024  4096   16   24.99 19.71%     1.783   127
ext3-reserv                   1024  4096   16   23.04 28.15%     1.849    82
xfs                           1024  4096   16   24.84 20.58%     1.300   121

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

ext3-dalloc is ext3 + extents + delayed allocation + multiblock allocator
ext3-reserv is ext3 + reservation patches by Mingming Cao

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