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From: "David J. Hughes" <bambi@Hughes.com.au>
Date: Mon, 19 Sep 2005 15:17:57 +1000
To: Uwe Doering <gemini@geminix.org>
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Cc: Brandon Fosdick <bfoz@bfoz.net>, freebsd-stable@freebsd.org
Subject: Re: Jail to jail network performance?
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On 14/09/2005, at 4:59 PM, Uwe Doering wrote:
>  So in case of MySQL you would have to use TCP sockets to communicate 
> between jails.  This socket type typically consumes more CPU because 
> of TCP's protocol overhead.  However, whether you would actually 
> notice any difference in speed basically depends on how much excess 
> CPU power there is available on that server.

The result of running these sort of connections over TCP rather than a 
UNIX domain connection are far more dramatic than this would indicate.  
When I wrote mSQL and added UNIX domain sockets as a connection option 
I was able to produce a 10 fold increase in query processing rates for 
basic queries.  If there's a high and constant rate of queries then 
doing it over a TCP connection is not going to win you any friends.


David
...