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Any idea why the results are not symmetrical? Upload from Virginia to California is twice as fast as from California to Viriginia (and it's even worse with US <-> Japan).

Are there strategical interests to not have a symmetric link?

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Actually, the results are reverse from what you said (y-axis is the origin). It likely has to do with traffic congestion coming out of each datacenter. Virginia has by far the heaviest use out of all the datacenters.

Maybe the link is symmetric, but the traffic flow is not - so in one direction the intertubes are more clogged.

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