Re: [Qemu-devel] [PATCH 06/16] migration: Create x-multifd-threads parameter

["Daniel P. Berrange" <berrange@redhat.com>]

On Mon, Mar 13, 2017 at 01:44:24PM +0100, Juan Quintela wrote:
> Indicates the number of threads that we would create.  By default we
> create 2 threads.
> 
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> diff --git a/qapi-schema.json b/qapi-schema.json
> index d21934b..b7cb26d 100644
> --- a/qapi-schema.json
> +++ b/qapi-schema.json
> @@ -985,13 +985,17 @@
>  # @x-checkpoint-delay: The delay time (in ms) between two COLO checkpoints in
>  #          periodic mode. (Since 2.8)
>  #
> +# @x-multifd-threads: Number of threads used to migrate data in parallel
> +#                     The default value is 2 (since 2.9)
> +#
>  # Since: 2.4
>  ##
>  { 'enum': 'MigrationParameter',
>    'data': ['compress-level', 'compress-threads', 'decompress-threads',
>             'cpu-throttle-initial', 'cpu-throttle-increment',
>             'tls-creds', 'tls-hostname', 'max-bandwidth',
> -           'downtime-limit', 'x-checkpoint-delay' ] }
> +           'downtime-limit', 'x-checkpoint-delay',
> +           'x-multifd-threads'] }
>  
>  ##
>  # @migrate-set-parameters:
> @@ -1054,6 +1058,10 @@
>  #
>  # @x-checkpoint-delay: the delay time between two COLO checkpoints. (Since 2.8)
>  #
> +#
> +# @x-multifd-threads: Number of threads used to migrate data in parallel
> +#                     The default value is 2 (since 2.9)
> +#

Presumably, the number of threads is the same as the number of sockets
opened ? It is probably useful to make it explicit that increasing
threads also causes increased number of TCP sockets to be opened.


Regards,
Daniel
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