Re: TCP window/stream size

http://en.wikipedia.org/wiki/TCP_window_scale_option

On Thu, Sep 10, 2009 at 12:37 PM, Christopher Copley
<copley.chris_at_gmail.com> wrote:
> Experts,
>
> I am doing some math and I am scratching my head...
> IPv4 only provides a 16-bit (unsigned) field for the window, so you can only
> increase the window size to 65535 bytes, which allows a maximum of 65535
> data bytes to be unacknowledged in transit at any time. With a one-second
> round-trip, that's a peak rate of 65 KB/sec, although that is 524,280 bits
> per second.
> So......
> RCV buffer size / RTT = Max TCP throughput
> ok, now 64K times 8 bits = 512000
> divide that by .04 (latency) and you come up with 12800000 or 12.8Mbs
> So by using this logic any one TCP stream can never get over ~13mbs right?
>
> Is my thinking and math correct on this question?
> So, is there any way to over come this limitation if the above is correct?
>
> Chris
>
>
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Received on Thu Sep 10 2009 - 13:07:37 ART