On Jul 11, 2012, at 11:18 AM, Day, Phil wrote:
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).
Xenserver's data is... complex to deal with. it doesn't have counters.
Basically, we can ask "how much bw has been used between time X and now." We
ask that periodically for, with time X being the start of the current audit
period, and update the bw cache table with that.
- 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()
Heh. that was a bug, which was recently fixed. Yes, we update per instance/mac
combo (now)
if not bwusage:
…
Thanks,
Phil
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