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SubjectRe: [dm-devel] [PATCH] staging: writeboost: Add dm-writeboost
On Wed, Dec 10, 2014 at 08:00:13PM +0900, Akira Hayakawa wrote:
> Hi, Joe
>
> Thanks for continuous evaluation.

Some more details:

dd, with block size 512b
------------------------

raw spindle : 143
writeboost Type 0: 137
writeboost Type 1: 130

dd, with block size 4k
----------------------

raw spindle : 31
writeboost Type 0: 29
writeboost Type 1: 81


dd, with block size 64m
-----------------------

raw spindle : 8.9
writeboost Type 0: 32
writeboost Type 1: 72



So maybe it's just volume of IO that's causing the problem? What's
the difference between Type 0 and Type 1? In the code I notice you
have 'rambuf' structures, are you caching IO in memory?



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