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Thanks for your reply. I indeed missed the filter configuration of the scheduler. It's ok now. 

Thank you very much,
Jeremy Liu

> -----Original Message-----
> From: yongli he [mailto:yongli.he at intel.com]
> Sent: Tuesday, March 04, 2014 9:28 AM
> To: openstack-dev at lists.openstack.org
> Subject: Re: [openstack-dev] [nova] A problem about pci-passthrough
> 
> On 2014年03月03日 22:21, Alexis Lee wrote:
> > Liuji (Jeremy) said on Mon, Mar 03, 2014 at 08:06:57AM +0000:
> >> Test scenario:
> >> 1)There are two compute nodes in the environment named A and B. A has
> two NICs of vendor_id='8086' and product_id='105e', B has two NICs of
> vendor_id='8086' and product_id='10c9'.
> >> 2)I configured "pci_alias={"vendor_id":"8086", "product_id":"10c9",
> "name":"a1"}" in nova.conf on the controller node, and of course the
> pci_passthrough_whitelist on this two compute nodes seperately.
> >> 3)Finally, a flavor named "MyTest" with extra_specs=
> >> {u'pci_passthrough:alias': u'a1:1'} 4)When I create a new instance with the
> "MyTest" flavor, it starts or is error randomly.
> >>
> >> The problem is in the _schedule function of
> nova/scheduler/filter_scheduler.py:
> >>              chosen_host = random.choice(
> >>                  weighed_hosts[0:scheduler_host_subset_size])
> >>              selected_hosts.append(chosen_host)
> >>
> >>              # Now consume the resources so the filter/weights
> >>              # will change for the next instance.
> >>
> >> chosen_host.obj.consume_from_instance(instance_properties)
> >>
> >> while "scheduler_host_subset_size" is configured to 2, the
> >> weighed_hosts are A and B, but the chosen_host is selected randomly.
> >> When chosen_host is B, the instance starts, but when chosen_host is
> >> A, the instance becomes error. The "consume_from_instance" will raise
> >> a exception.
> > Hi Jeremy,
> >
> > You didn't mention the PciPassthroughFilter, have you enabled this in
> definitely need this filter.
> 
> Yongli He
> > your scheduler?
> >    https://wiki.openstack.org/wiki/Pci_passthrough
> >
> >
> > Alexis
> 
> 
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