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Re: [Qemu-devel] [PATCH 02/11] Add migrate_set_parameter and query-migra

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 02/11] Add migrate_set_parameter and query-migrate-parameters
Date: Mon, 30 Jul 2012 13:24:42 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0

On 07/30/2012 01:12 PM, Juan Quintela wrote:
> Orit Wasserman <address@hidden> wrote:
>> The management can enable/disable a capability for the next migration by 
>> using
>> migrate_set_parameter command.
>> The management can query the current migration capabilities using
>> query-migrate-parameters
>> Signed-off-by: Orit Wasserman <address@hidden>
>> Signed-off-by: Juan Quintela <address@hidden>
> I just noticed .... shouldn't we use
> migrate_set_parameter cache_size 256M
> ???
> I think that even the old migration parameters could be added to this
> one?
> migrate_set_parameter downtime 30ms
> migrate_set_parameter bandwidth 1G

The existing patch was written under the assumption that parameters were
only ever bool; but you are proposing allowing non-bool parameters.

> This way everything would be more regular, and easier on libvirt, as new
> parameters would be trivial to ask for?

That depends on the QMP interface you come up with for expressing
non-bool parameters.  This patch series has already been churning for
several months now, which makes it feel a bit late to be changing the
interface to support non-bool parameters, unless we really like the idea
and can afford another delay in getting this series in.

Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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