Hi folks,

For people who might be interested, here is how btrfs performs
with two partitions on a single SSD drive in a RAID-1 mirror.

This is on a Dell E4200 with Core 2 Duo U9300 (1.2GHz), 2GB RAM
and a Samsung SSD (128GB Thin uSATA SSD).

Version 1.03c       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
sys26            2G           28299  17 18633  12           85702  29  3094  18
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  7513  99 +++++ +++  5140  98  3964  67 +++++ +++  5652  99
sys26,2G,,,28299,17,18633,12,,,85702,29,3093.9,18,16,7513,99,+++++,+++,5140,98,3964,67,+++++,+++,5652,99

real    3m51.883s
user    0m0.360s
sys     0m46.099s

I'd previously blogged a test with 2.6.29-rc2 and there's no
real difference between the two runs.

http://www.csamuel.org/2009/01/04/btrfs-raid1-benchmark-on-dell-e4200-with-128gb-ssd

For a comparison, here is XFS on a single partition:

Version 1.03c       ------Sequential Output------ --Sequential Input- --Random-
                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
sys26            2G           62075  19 36634  16           92023  26  1432  12
                    ------Sequential Create------ --------Random Create--------
                    -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16   585  13 +++++ +++   578   5   538  11 +++++ +++   417   5
sys26,2G,,,62075,19,36634,16,,,92023,26,1431.8,12,16,585,13,+++++,+++,578,5,538,11,+++++,+++,417,5

real    4m10.987s
user    0m0.404s
sys     0m33.602s

Block I/O is faster, but btrfs hammers it for metadata operations, an
order of magnitude faster!

cheers,
Chris
-- 
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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