On 11/03/2012 04:05 PM, Alan Robertson wrote:
>
>> * Memory footprint O(hosts log network-hops) due to over zealous ECMP,
In order for me to preserve my ever-precarious illusion that I know what
I'm doing ;-), I looked up ECMP - Equal Cost Multi-Path Routing.
One of the nice things about the topology-sensitive neighbor
heartbeating is that even for a very large number of hosts and a goodly
number of sites, very few packets cross sites - or even subnets.
So, even if this were to somehow occur, and cause memory inflation, it
should only affect a small number of systems, because the overwhelming
number of systems would not be subject to routing at all (intra-switch
packets typically avoid routing).
Of course, this assumes that I have implemented the code that I haven't
yet done, and that code does understand the topology, and that it is
sufficiently bug-free. For most networks, that should be by far the
normal case.
Figuring out where subnets begin and end is typically straightforward.
But as I should have noted before (and now have in the test plan), this
first release won't include more than one ring - which potentially
brings this back up -- except...
I wouldn't think of this first release as an ideal candidate for
deploying over thousands of servers - so hopefully this should be
avoided for this release anyway.
--
Alan Robertson <[email protected]> - @OSSAlanR
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
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