[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?
> 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.
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