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From Dirk-Willem van Gulik <>
Subject Re: tcp_get_info()....
Date Thu, 07 Feb 2008 15:23:23 GMT

On Feb 7, 2008, at 2:28 PM, Colm MacCarthaigh wrote:

> On Thu, Feb 07, 2008 at 12:39:14PM +0100, Dirk-Willem van Gulik wrote:
>> Have a look at the ntp protocol - it is fairly effective at this -
>> and I would not rule out that you'd be able to do something similar
>> (abeit less accurate) on a keep-alive connection.
> NTP does it via phase-lock loop, and it's pretty clever alright, a PLL
> could be applied to the back and forth traffic for HTTP alright, as  
> long
> as the implementor took great care to work around things like accept
> filters (so throw away the first session). It'd be interesting,
> mod_youre_on_sattellite_broadband ;-)

I just tried it with a bit of ajaxy/javascript on a keep alive  
connection - but did not get very far - no convergence -- but that may  
be as the CGI is not called with predictable enough a delay -- a  
module may be indeed what is needed.


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