Re: [Qemu-devel] [PATCH 2/9] migration: Add announce parameters

[Eric Blake]

On 1/28/19 11:03 AM, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <address@hidden>
> 
> Add migration parameters that control RARP/GARP announcement timeouts.
> 
> Based on earlier patches by myself and
>   Vladislav Yasevich <address@hidden>
> 
> Signed-off-by: Dr. David Alan Gilbert <address@hidden>
> ---

> +++ b/qapi/migration.json
> @@ -6,6 +6,7 @@
>  ##
>  
>  { 'include': 'common.json' }
> +{ 'include': 'net.json' }
>  
>  ##
>  # @MigrationStats:
> @@ -480,6 +481,18 @@
>  #
>  # Migration parameters enumeration
>  #
> +# @announce-initial: Inital delay (in ms) before sending the first announce

s/Inital/Initial/ [2]

> +#          (Since 4.0)
> +#
> +# @announce-max: Maximum delay (in ms) between packets in the announcment
> +#          (Since 4.0)
> +#
> +# @announce-rounds: Number of self-announce packets sent after migration
> +#          (Since 4.0)
> +#
> +# @announce-step: Increase in delay (in ms) between subsequent packets in
> +#          the announcement (Since 4.0)
> +#

The new parameters are optional below [1]; should they have a default
value documented, and are there any constraints such that if you set
one, you must set all four to match the previous' patch having all four
be non-optional?


> @@ -653,7 +681,11 @@
>  # TODO either fuse back into MigrationParameters, or make
>  # MigrationParameters members mandatory
>  { 'struct': 'MigrateSetParameters',
> -  'data': { '*compress-level': 'int',
> +  'data': { '*announce-initial': 'size',
> +            '*announce-max': 'size',
> +            '*announce-rounds': 'size',
> +            '*announce-step': 'size',
> +            '*compress-level': 'int',

[1] mentioned above

>              '*compress-threads': 'int',
>              '*compress-wait-thread': 'bool',
>              '*decompress-threads': 'int',
> @@ -692,6 +724,18 @@
>  #
>  # The optional members aren't actually optional.
>  #
> +# @announce-initial: Inital delay (in ms) before sending the first announce
> +#          (Since 4.0)

[2] again


> @@ -769,7 +813,11 @@
>  # Since: 2.4
>  ##
>  { 'struct': 'MigrationParameters',
> -  'data': { '*compress-level': 'uint8',
> +  'data': { '*announce-initial': 'size',
> +            '*announce-max': 'size',
> +            '*announce-rounds': 'size',
> +            '*announce-step': 'size',
> +            '*compress-level': 'uint8',

[1] again

>              '*compress-threads': 'uint8',
>              '*compress-wait-thread': 'bool',
>              '*decompress-threads': 'uint8',
> @@ -785,7 +833,7 @@
>              '*x-multifd-page-count': 'uint32',
>              '*xbzrle-cache-size': 'size',
>           '*max-postcopy-bandwidth': 'size',
> -            '*max-cpu-throttle':'uint8'} }
> +            '*max-cpu-throttle':'uint8' } }

Why the whitespace churn?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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