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<div>On Jul 11, 2012, at 11:18 AM, Day, Phil wrote:</div>
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Hi All,<o:p></o:p></div>
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<o:p> </o:p></div>
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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:<o:p></o:p></div>
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<o:p> </o:p></div>
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<span>-<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span>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).<o:p></o:p></div>
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<div>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.</div>
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<o:p> </o:p></div>
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<o:p> </o:p></div>
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<span>-<span style="font: normal normal normal 7pt/normal 'Times New Roman'; "> <span class="Apple-converted-space"> </span></span></span>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:<o:p></o:p></div>
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<o:p> </o:p></div>
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bwusage = model_query(context, models.BandwidthUsage,<o:p></o:p></div>
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session=session, read_deleted="yes").\<o:p></o:p></div>
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filter_by(start_period=start_period).\<o:p></o:p></div>
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filter_by(uuid=uuid).\<o:p></o:p></div>
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first() </div>
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<div>Heh. that was a bug, which was recently fixed. Yes, we update per instance/mac combo (now)</div>
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if not bwusage:<o:p></o:p></div>
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…<o:p></o:p></div>
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<o:p> </o:p></div>
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Thanks,<o:p></o:p></div>
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Phil<o:p></o:p></div>
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<div>--</div>
<div><span class="Apple-tab-span" style="white-space: pre; "></span>Monsyne M. Dragon</div>
<div><span class="Apple-tab-span" style="white-space: pre; "></span>OpenStack/Nova </div>
<div><span class="Apple-tab-span" style="white-space: pre; "></span>cell 210-441-0965</div>
<div><span class="Apple-tab-span" style="white-space: pre; "></span>work x 5014190</div>
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