Re: [Xen-devel] [PATCH 0 of 2] [Resend v2] remus: Checkpoint Compression

[Shriram Rajagopalan <rshriram@xxxxxxxxx>]

On Tue, Jun 21, 2011 at 11:29 AM, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx> wrote:

George Dunlap writes ("Re: [Xen-devel] [PATCH 0 of 2] [Resend v2] remus: Checkpoint Compression"):

> If I understand the patch correctly,the compression is of a special
> kind: it's not gzipped, but the new page is compared to the previous
> page, and only the differences sent.  (This is done in a clever way to
> be computationally efficient.)
>
> So simply running the whole stream through gzip won't have the same
> effect: it won't take advantage of the fact that most of the data
> already exists on the remote side, and only send the differences.  So it
> will most likely take more computation power to compress, and end up
> with a higher bandwitdh.

Thanks George. That about sums the idea behind the patch.

shriram

Thanks.  I shall read the patch in more detail.

Ian.

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