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From: Paolo Bonzini <bonzini@gnu.org>
To: Alexander Graf <agraf@suse.de>
Cc: Kevin Wolf <kwolf@redhat.com>,
	qemu-devel@nongnu.org, Christoph Hellwig <hch@lst.de>
Subject: [Qemu-devel] Re: [PATCH] Add tar container format
Date: Mon, 17 Aug 2009 14:05:26 +0200	[thread overview]
Message-ID: <4A894786.1040306@gnu.org> (raw)
In-Reply-To: <1F7A05E1-0B0B-4C68-B07B-2F36B9BECF81@suse.de>


> Bzip2 is supposed to be chunkable, but I haven't found anyone who did
> this yet and my knowledge in compression is pretty small.

Bzip2 proceeds in chunks of approximately 100-900 KB size.  However, the 
size is taken after an initial RLE compression pass.  So bzip2 is only 
chunkable if you remove the initial RLE compression---this means hacking 
the bzip2 executable (see ADD_CHAR_TO_BLOCK and add_pair_to_block) in 
bzip2's bzlib.c.

Using GIO may have been a good idea a few years ago, but it seems a bit 
overengineered given that the block layer of qemu works well and it is 
pretty complex.

Paolo

      parent reply	other threads:[~2009-08-17 12:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-05 15:33 [Qemu-devel] [PATCH] Add tar container format Alexander Graf
2009-08-13 22:57 ` Anthony Liguori
2009-08-13 23:08   ` Alexander Graf
2009-08-13 23:13     ` Anthony Liguori
2009-08-13 23:15       ` Anthony Liguori
2009-08-15 20:36       ` Christoph Hellwig
2009-08-17 12:05     ` Paolo Bonzini [this message]

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