What is the price of using md raid in perfomance matter.

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Shown tables are generated by bonnie on md level 0, level 1, and directly on device.


            -------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
md_1             4G 29434  97  60303  47 26859  13 31448  97  63791  19 430.1   1
md_0             4G 28963  97 106220  79 51660  28 31390  98 127605  41 421.3   1
direct           4G 28530  95  60638  47 27528  13 31255  97  63966  18 280.9   1

                         ------Sequential Create------ --------Random Create--------
                         -Create-- --Read---  --Delete- -Create-- --Read---   --Delete--
      files:max:min       /sec %CP  /sec %CP   /sec %CP  /sec %CP  /sec  %CP   /sec %CP
md_1      100:100:0         4398  83 87013  99  14563  70  3748  89  99414  99  13564  71
md_0      100:100:0         4214  91 93285 100  16189  83  3999  91 108003  99  16596  90
direct    100:100:0         4193  83 89778  99  15138  76  4015  91 101260 100  14435  78

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