linux-kernel - Re: [dm-devel] [PATCG]DM: dm-compression: a compressed DM target for SSD

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Message-ID: <20131228132248.GB16613@agk-dp.fab.redhat.com>
Date:	Sat, 28 Dec 2013 13:22:48 +0000
From:	Alasdair G Kergon <agk@...hat.com>
To:	Shaohua Li <shli@...nel.org>
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com, axboe@...nel.dk,
	agk@...hat.com, snitzer@...hat.com
Subject: Re: [dm-devel] [PATCG]DM: dm-compression: a compressed DM target
	for SSD

On Sat, Dec 28, 2013 at 12:57:25PM +0000, Alasdair G Kergon wrote:
> To use this compression target above dm-thin (likely to prefer larger
> block sizes), for example, could the block sizes be adapatable /
> configurable?

So a key feature of the underlying thin provisioning needs to be
efficient tracking of a small sector size (which doesn't suit the
existing dm-thin target).  This compression target could sometimes
benefit from a larger block size though, particularly where the 
data above has large blocks.

(Could we name this something like 'microcompression'?)
 
Alasdair

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