Jail to jail network performance?

[Lyndon Nerenberg]

On Sep 13, 2005, at 11:59 PM, Uwe Doering wrote:

> Now, for security reasons jails normally are confined in separate  
> filesystems, or at least in separate parts of a common one.  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.

Ignoring security (or filesystem namespace issues) I will just note  
that using named sockets for local IPC is a Good Thing.  When I  
worked at Messaging Direct I taught sendmail to speak LMTP over named  
sockets, and our local delivery rate (to our IMAP server) went up by  
a factor of 10.

It would be really cool if we could figure out a way to do AF_UNIX  
between jails, but I confess to not having thought about any of the  
implications ...  (Maybe netgraph can help here?)

--lyndon