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> So, just for Google alone that change could save on the order of 100GB of traffic per day

So say $150 dollars/mo? Or 0.00002% of their profit/year. Come on.

> I don't think the paper provides statistics on how much a prefix dictionary saves over not having one at all.

The paper compares plain, deflate, and deflate + prefix dictionary. Prefix is only a benefit on the first request and response, adding up to 121 on average in their test.

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> The paper compares plain, deflate, and deflate + prefix dictionary. Prefix is only a benefit on the first request and response, adding up to 121 on average in their test.

As far as I can tell, it seems to compare plain, deflate with SPDY's current prefix dictionary, and deflate with the paper's proposed prefix dictionary.

You are correct, the paper does not compare to compression with a null prefix. In haste I read it wrong, since it was not too far off from calculations I had done previously in a reddit discussion where I found ~100 bytes saved using the prefix dictionary. Thanks for being persistent and I'll see if I can rerun their data using a null prefix before the next Spdy thread, but I doubt it will show more than 200 bytes total savings per connection, which doesn't change anything IMO.

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