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Re: [Qemu-devel] [PATCH v11 3/9] Add XBZRLE documentation
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH v11 3/9] Add XBZRLE documentation |
Date: |
Tue, 22 May 2012 07:13:52 -0600 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 |
On 05/22/2012 06:56 AM, Orit Wasserman wrote:
> Signed-off-by: Orit Wasserman <address@hidden>
> ---
> docs/xbzrle.txt | 114
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 114 insertions(+), 0 deletions(-)
> create mode 100644 docs/xbzrle.txt
>
> diff --git a/docs/xbzrle.txt b/docs/xbzrle.txt
> new file mode 100644
> index 0000000..16950d5
> --- /dev/null
> +++ b/docs/xbzrle.txt
> @@ -0,0 +1,114 @@
> +XBZRLE (Xor Based Zero Run Length Encoding)
> +===========================================
> +
> +Using XBZRLE (Xor Based Zero Run Length Encoding) allows for the reduction
> of VM
> +downtime and the total live-migration time of Virtual machines.
> +It is particularly useful for virtual machines running memory write intensive
> +workloads that are typical of large enterprise applications such as SAP ERP
> +Systems, and generally speaking for any application that uses a sparse memory
> +update pattern.
> +
> +Instead of sending the changed guest memory page this solution will send a
> +compressed version of the updates, thus reducing the amount of data sent
> during
> +live migration.
> +In order to be able to calculate the update, the previous memory pages
> needed to
s/needed/need/
> +be stored. Those pages are stored in a dedicated cache (hash table) and are
s/stored./stored on the source./
> +Format
> +=======
> +
> +The compression format uses the zero value, where zero represents an
> unchanged
> +value.
s/uses the zero value/performs an XOR between the previous and current
content of the page/
--
Eric Blake address@hidden +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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- [Qemu-devel] [PATCH v11 0/9] XBZRLE delta for live migration of large memory app, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 1/9] Add MigrationParams structure, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 3/9] Add XBZRLE documentation, Orit Wasserman, 2012/05/22
- Re: [Qemu-devel] [PATCH v11 3/9] Add XBZRLE documentation,
Eric Blake <=
- [Qemu-devel] [PATCH v11 6/9] Add save_block_hdr function, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 5/9] Add uleb encoding/decoding functions, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 7/9] Add XBZRLE to ram_save_block and ram_save_live, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 2/9] Add migration capabilites, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 8/9] Add set_cachesize command, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 4/9] Add cache handling functions, Orit Wasserman, 2012/05/22
- [Qemu-devel] [PATCH v11 9/9] Add XBZRLE statistics, Orit Wasserman, 2012/05/22