From: Roger Binns <rogerb@rogerbinns.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: Working on Btrfs as topic for master thesis
Date: Wed, 22 Jan 2014 12:55:39 -0800 [thread overview]
Message-ID: <lbpb7v$7m2$1@ger.gmane.org> (raw)
In-Reply-To: <20140122121220.GF6498@twin.jikos.cz>
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On 22/01/14 04:12, David Sterba wrote:
> I have done some work here, so far it's stalled due to more important
> work.
>
> https://btrfs.wiki.kernel.org/index.php/Project_ideas#Compression_enhancements
>
> Do you have other suggestions beyond what's proposed there?
There was the theoretical side - ie coming up with a way of defining
perfection which then allows measuring against. For example you have
going up to a 128K block size but without knowing the theoretical best we
don't know if that is a stopgap or very good.
That also feeds into things like if it would be a good idea to go back
afterwards (perhaps as part of defrag) and spend more effort on
(re)compression.
Another consideration is perhaps having the compression dictionary kept
separate from the compressed blocks thereby allowing it to be used across
blocks and potentially files. Compressors like smaz (very good on short
pieces of text) work by having a precomputed dictionary - perhaps those
can be used too.
Roger
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next prev parent reply other threads:[~2014-01-22 20:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-16 19:23 Working on Btrfs as topic for master thesis Toggenburger Lukas
2014-01-17 15:34 ` David Sterba
2014-01-17 16:04 ` Tomasz Torcz
2014-01-18 12:50 ` Toggenburger Lukas
2014-01-22 12:05 ` David Sterba
2014-01-22 13:35 ` Hugo Mills
2014-01-20 5:44 ` Roger Binns
2014-01-22 12:12 ` David Sterba
2014-01-22 20:55 ` Roger Binns [this message]
2014-01-23 18:36 ` David Sterba
2014-01-23 21:47 ` Roger Binns
2014-01-20 12:20 ` Austin S Hemmelgarn
2014-01-21 6:42 ` Sandy McArthur
2014-01-21 12:25 ` Austin S Hemmelgarn
2014-01-21 16:52 ` Hugo Mills
2014-01-21 16:59 ` Austin S Hemmelgarn
2014-01-22 12:20 ` David Sterba
2014-01-22 12:24 ` David Sterba
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