On Aug 18, 2011 12:21 AM, "Ben Pfaff" <b...@nicira.com> wrote: > > [bringing Neil McKee into the conversation since he knows more about > this than me] > > On Wed, Aug 17, 2011 at 02:17:03PM +0800, Jesse Gross wrote: > > The one piece that I'm the least sure of is how to handle stats. In > > my ideal world, we would drop the sample pool altogether and have > > userspace figure it out for itself. The information is clearly > > present in userspace to calculate any packet count that may be > > required but it might not be instantaneously accurate. I'm unsure of > > the consequences of this. I think it's reasonable to report some kind > > of stats (current flow stats seems to fit) but if you're trying to get > > the current port counters then that isn't really useful. Directly > > reporting port count seems a little out of place to me. Ben, (or > ^^^^^^^^^ packet count?
Yes, sorry, I meant packet count on the port (as opposed to the flow), which is essentially what the sample pool is. > > anyone else) do you have any thoughts? > > My understanding is that the sflow sample pool should be > asymptotically correct, that is, it should be within O(1) of the > correct value as n increases to infinity. So I think that it's OK if > the stats are always instantaneously behind a bit. OK, I buy that and it means that userspace already has all the information it needs.
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