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

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Adam Langley wrote:
| On Wed, Aug 13, 2008 at 1:36 PM, Eric Rescorla
<ekr@networkresonance.com> wrote:
|> You're right, it does suck as an argument. And given that it's
|> superficially implausible for the reasons you elided, I don't feel the
|> need to entertain this as a serious design objective.
|
| I certainly don't agree that it's superficially implausible. I shall
| ask someone senior here if I can release some of our latency affect
| data, although I doubt the answer will be positive.
|
| Remeber that > 40% of US homes are still using dial-up[1] and that's
| leveling out. Even if you are within the US, the RTT across the
| country on a dial-up is 300-400ms[2].

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.

[2] is a VERY old reference using a 10-year-old modem standard that
lasted only two years (1998-1999). V.92 superceded it in 1999.

I measured RTTs from LA to Boston, and found 200-220ms. Pings locally
were 140-150ms; the bulk of the increased ping delay was the modems.
Unless you're going through a satellite or a very inefficient multihop
radio system (e.g., anyone remember Metricom?), delays ought not exceed
around 150ms + broadband delays, e.g., they ought to top out around 250ms.

Joe

| [1] http://www.websiteoptimization.com/bw/0804/
| [2] http://www.rohwer.org/Latency/Latency9.html
|
| AGL
|
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