Open Stack

> -----Original Message-----
> From: Vladimir Popovski [mailto:vladimir at zadarastorage.com]
> Sent: Friday, November 02, 2012 3:30 AM
> To: Vishvananda Ishaya; OpenStack Development Mailing List
> Subject: Re: [openstack-dev] Some idea on device assignment support
> 
> Hi All,
> 
> In next couple of days we will resume our PCI passthrough/SR-IOV proposal.
> With the help from Cisco folks I'm sure we will be able to propose it
> pretty soon.

Really great!

> 
> I suppose that on the first stage it might be enough to use
> instance_types's extra specs to specify what exactly should be assigned to
> the instance. I don't think that cloud users should have a control about
> what and when should be attached (for sure not physical USBs). IMHO,
> having special instance types (like with X PCI devices of type Y or with
> GPU, etc) will be enough.

Agree that cloud user should have no control of "what and when should be attached", 

but I'm not sure how the extra_specs format would be. IMHO, cloud user have
no idea of "X PCI device, type Y), but need like 10G NIC, 1G NIC etc, especially considering
multiple type NIC card may exists in the cloud. An translation from resource type to
PCI path will be helpful.

Also as Ian stated, some device type may have special requirement, like NIC may want
To communicate with Quantum. Of course, we can do that step by step based on your implementation.
 
> 
> We can easily propagate information about device availability to the
> scheduler and on scheduler level to make a decision about proper host.
> 
> Regarding querying HW resources - we implemented it on host settings
> level. Of course we can add something on virt driver level, but it will be
> quite different per each installation type.

Agree that host setting level will be helpful. Cloud administrator decide the devices
that can be assigned to VM.

Thanks
-jyh

> 
> Regards,
> -Vladimir
> 
> 
> -----Original Message-----
> From: Vishvananda Ishaya [mailto:vishvananda at gmail.com]
> Sent: Thursday, November 01, 2012 11:22 AM
> To: OpenStack Development Mailing List
> Cc: Ian Wells; vladimir at zadarastorage.com
> Subject: Re: [openstack-dev] Some idea on device assignment support
> 
> 
> On Nov 1, 2012, at 8:39 AM, heut2008 <heut2008 at gmail.com> wrote:
> 
> >
> > should  we create  a new table to  manage all these  devices? or  each
> > nova-compute node manage their own devices allocation,if there is no
> > new table to record this.  we need each kind of passthrough  devices
> > has a driver to keep track of how many resources is free and how many
> > is in use,  these info  is updated to schedule  by sending capability
> > info periodly.
> 
> I would prefer to avoid adding new tables unless we have to. It seems like
> the HostState class in host_manager needs to be able to support arbitrary
> keys for counting resources. Then we could create filter and weighting
> functions based on these arbitrary keys and update the consume method to
> consume resources from these keys based on instance_type_extra_specs.
> 
> Perhaps we need some kind of compute_metadata. there is a compute stats
> table which we might be able to abuse for this purpose.
> 
> Vish
> 
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