Re: [tcpm] SYN/ACK Payloads, draft 01

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Adam Langley wrote:
| On Wed, Aug 13, 2008 at 5:51 PM, Joe Touch <touch@isi.edu> wrote:
|> I think you're quoting >40% by assuming that anyone who doesn't use
|> broadband uses a modem (i.e., 100-57% = 43%), which isn't what those
|> charts indicate. The direct metric from citation [1] is Fig 2, which
|> shows less than 12% of homes using dialup right now, a figure that has
|> been steadily falling for the entire timeline shown.
|
| I believe that the number of homes with broadband is, indeed, 57%.

It's 57% of homes having broadband access. That does NOT imply that the
other 43% use dialup; some people still don't use the Internet, or (as
you note below) that all 57% have broadband turned on.

| (Although it's a fair point that some might be using's others
| unsecured wireless connections). On another reading of the report, it
| looks like this is the number of homes were broadband is /available/.
| There are /two/ figures labeled "Figure 2", so I'll refer to them as
| the first and second:
|
| I think the first fig 2 includes the numbers of people who are using
| broadband connections at work and the second figure 2 has a much
| higher number because it counts active users. Homes with broadband are
| more likely to use it, it seems.

Fig 2 is fairly conclusive to the point you're making; the ratio of
broadband to dialup - by house - is 88:12. You've noted that reducing a
single RTT is significant for dialup users; these figures argue that
such users are a small minority (12%), and perhaps this is thus
optimizing for a small, disappearing group.

Joe
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