On Sat, Nov 07, 2015 at 15:06:03 +0000, Feng, Shaohe wrote:
>
> > However, since we already have VIR_MIGRATE_COMPRESSED flag and I can
> > imagine various other hypervisors could support
> > their own compression methods, I think using flags for selecting the
> > compression method is wrong. So what if we keep just
> > VIR_MIGRATE_COMPRESSED flag and introduce a new migration parameter to let
> > the user select what compression method
> > they want to use (XBZRLE, multithreaded compression, ...) and each of them
> > could be further configurable with additional
> > parameters. Each hypervisor would also advertise a list of supported
> > compression methods via
> > virConnectGetDomainCapabilities. QEMU would have XBZRLE method selected by
> > default for backward compatibility (it would
> > have to be advertised as the default method in
> > virConnectGetDomainCapabilities too).
> >
>
> Hi, Jiri.
>
> I have check the domcapabilities.
> There is no any compression info from domcapabilities.
>
> Do you means we need to add a new element of domainCapabilities as follow:
> <domainCapabilities>
> <migration>
> < XBZRLE supported='yes'>
> </ XBZRLE >
> < mutil-thread supported='yes'>
> <method >
> <value>xz</value>
> </method >
> <level >
> <value>8</value>
> </ level >
> <compress-counter>
> <value>4</value>
> </ compress-counter >
> <decompress-counter>
> <value>2</value>
> </decompress-counter >
> </ mutil-thread >
> </ migration >
> </domainCapabilities>
In general yes, but I was thinking about a bit different schema:
<domcapabilities>
...
<migration>
<compression>
<method name='xbzrle' default='yes'>
<param name='cache'/>
</method>
<method name='mt'>
<param name='level'/>
<param name='threads'/>
<param name='dthreads'/>
</method>
...
</compression>
</migration>
</domcapabilities>
Jirka
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