On 04/08/2015 12:20 AM, Liang Li wrote:
> The multiple compression threads can be turned on/off through
> qmp and hmp interface before doing live migration.
> 
> Signed-off-by: Liang Li <liang.z.li@intel.com>
> Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
> Reviewed-by: Dr.David Alan Gilbert <dgilbert@redhat.com>
> Reviewed-by: Eric Blake <eblake@redhat.com>
> ---
>  migration/migration.c |  7 +++++--
>  qapi-schema.json      | 11 ++++++++++-
>  2 files changed, 15 insertions(+), 3 deletions(-)
> 

> +# @compress: Use multiple compression threads to accelerate live migration.
> +#          This feature can help to reduce the migration traffic, by sending
> +#          compressed pages. Please note that if compress and xbzrle are both
> +#          on, compress only takes effect in the ram bulk stage, after that,
> +#          it will be disabled and only xbzrle takes effect, this can help to
> +#          minimize migration traffic. The feature is disabled by default.
> +#          (since 2.3)

Maintainer can tweak this to 2.4, since we've missed 2.3.  My R-b still
stands.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org