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load balancing (was: Re: re(4) update)

From: "Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>
Date: Mon, 30 Oct 2006 19:01:38 +0100

[redirecting to users@]

Matthew Dillon wrote:
>     The solution was to have a couple of cookie-cutter boxes front-ending
>     all the WWW connections, doing the first few protocol interactions
>     (e.g. processing the WWW command and the Host: header), then
>     looking the info up in a DBM and reconnecting to the actual machine.
>     * It didn't matter which machine handled a connection.  Each machine
>       was an exact cookie cutter copy.  A DBM update was pushed out to 
>       the boxes once an hour via cron.
>     * I could add or remove machines at will.  Bandwidth and loading was
>       never an issue.  We never needed more then 3 boxes, though.

How did you dispatch between those boxes?  Use a round-robin DNS, or
something more sophisticated?

How did you relay the data on those boxes?  Just simple poll/read/write
cycles?  I realize that you just said that it just added 2ms delay, but
doesn't the transferred data get copied several times around in the box?
 What's the fuzz about zero-copy then, if this copying doesn't matter?


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