Hi, all
I find a problem about pci-passthrough.
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.
I think it is a bug. Is there a problem with my test operation or need some
other configuration?
Thanks,
Jeremy Liu
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