Hi All,
I'm looking at the network bandwidth code with a view to how the current
framework could be made to work with libvirt, and a I have a couple of
questions that hopefully someone familiar with the Xen implementation can
answer:
- Do the Xen counters get reset after they are read, or are the values
always cumulative ? (I'm guessing the latter as they seem to be just
overwritten by the periodic task).
- It looks as if the table is intended to provide a set of values per
instance_uuid/mac combination (presumably to have counters per NIC), but the
code which updates the entries looks like it always just updates the first
entry it finds for a particular uuid:
bwusage = model_query(context, models.BandwidthUsage,
session=session, read_deleted="yes").\
filter_by(start_period=start_period).\
filter_by(uuid=uuid).\
first()
if not bwusage:
...
Thanks,
Phil
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