He measured the upload capacity of the peers by downloading from them, or am I being dumb? :)

2015-07-23 18:05 GMT+02:00 Peter Todd via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>:

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On 23 July 2015 10:19:59 GMT-04:00, slurms--- via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
>This does not support the theory that the network has the available
>bandwidth for increased block sizes, as in its current state 37% of
>nodes would fail to upload a 20MB block to a single peer in under 20
>seconds (referencing a number quoted by Gavin). If the bar for
>suitability is placed at taking only 1% of the block time (6 seconds)
>to upload one block to one peer, then 69% of the network fails for 20MB
>blocks. For comparison, only 10% fail this metric for 1MB blocks.

Note how due to bandwidth being generally asymetric your findings are probably optimistic - you've measured download capacity. On top of that upload is further reduced by the fact that multiple peers at once need to be sent blocks for reliability.

Secondly you're measuring a network that isn't under attack - we need significant additional margin to resist attack as performance is consensus-critical.

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