linux-kernel - Re: [dm-devel] [PATCH] staging: writeboost: Add dm-writeboost

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Message-ID: <20141210123349.GC21108@debian>
Date:	Wed, 10 Dec 2014 12:33:50 +0000
From:	Joe Thornber <thornber@...hat.com>
To:	Akira Hayakawa <ruby.wktk@...il.com>
Cc:	ejt@...hat.com, dm-devel@...hat.com, gregkh@...uxfoundation.org,
	snitzer@...hat.com, agk@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [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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