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We then looked to see what portion of the larger IPDV early in the year was related to adding now monitoring and remote hosts. If we select the same host-pairs in both say Nov 2010 and April 2010 then the improvement ((ipdv(Apr)-ipdv(Nnov))/ipdv(Apr) in IPDV is about 47%. Thus things have improved with lower IPDVs for the selected host pairs.
Unfortunately we do not have traceroutes between all the sites to see if they have changed over time.
Comparing for Nov 2010 the average IPDV for all pairs with that for just the pairs in both April 2010 and November 2010 one gets 5.13ms verses 4.58. Thus some of the reduction appears to be due to the new hosts added.
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