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Re: [Qemu-devel] [PATCH v5 05/17] migration: Create x-multifd-threads pa
From: |
Juan Quintela |
Subject: |
Re: [Qemu-devel] [PATCH v5 05/17] migration: Create x-multifd-threads parameter |
Date: |
Tue, 08 Aug 2017 10:46:15 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
"Dr. David Alan Gilbert" <address@hidden> wrote:
> * Juan Quintela (address@hidden) wrote:
>> Indicates the number of threads that we would create. By default we
>> create 2 threads.
>>
>> Signed-off-by: Juan Quintela <address@hidden>
>> Reviewed-by: Dr. David Alan Gilbert <address@hidden>
>
> Also needs updating DEFINE_PROP stuff - and if Markus' qapi patch lands.
Done.
>> #
>> # @return-path: If enabled, migration will use the return path even
>> # for precopy. (since 2.10)
>> +#
>> # @x-multifd: Use more than one fd for migration (since 2.10)
>> #
>> # Since: 1.2
>> @@ -910,6 +911,7 @@
>> 'data': ['xbzrle', 'rdma-pin-all', 'auto-converge', 'zero-blocks',
>> 'compress', 'events', 'postcopy-ram', 'x-colo', 'release-ram',
>> 'block', 'return-path', 'x-multifd'] }
>> +
>
> Escapee from previous patch.
Done.
>
>> ##
>> # @MigrationCapabilityStatus:
>> #
>> @@ -1026,13 +1028,19 @@
>> # migrated and the destination must already have access to the
>> # same backing chain as was used on the source. (since 2.10)
>> #
>> +# @x-multifd-threads: Number of threads used to migrate data in
>> +# parallel. This is the same number that the
>> +# number of sockets used for migration.
>> +# The default value is 2 (since 2.10)
>> +#
>
> That did make me think for a moment; I guess '2' makes sense once you've
> set the x-multifd capability on. The other possibility would be to
> remove the capability and just rely on the threads > 1
I think this is the same that xbzrle cache size. It has a default
value. But we only used it when we set the capability.
I think that it makes the code more ortogonal with the others, no?
Later, Juan.
- Re: [Qemu-devel] [PATCH v5 05/17] migration: Create x-multifd-threads parameter,
Juan Quintela <=