Re: Persistence & Cache clusters

To: Lars Marowsky-Bree <lmb@xxxxxxxxx>
Subject: Re: Persistence & Cache clusters
Cc: "Stephen D. Williams" <sdw@xxxxxxx>, lvs-users@xxxxxxxxxxxxxxxxxxxxxx
From: Wensong Zhang <wensong@xxxxxxxxxxxx>
Date: Sun, 26 Sep 1999 22:51:16 +0800

Lars Marowsky-Bree wrote:
> What I would like to see/do is to have the initial decision where the
> connection should go handled by a user level process which would do the TCP/IP
> handshake and snoop the request (if it deems that this is necessary), then
> create the real connection to the server and add a "fast forwarding" entry to
> the masquerading table so all further packets do not go through the
> application.

This is a feature that I want to implement, called application-based 
scheduling. Michael and I used to talk about this to use LVS to 
implement content-based switching in proxy cluster. However, it is
not easy to implement. The kernel must have architecture to copy
packets to user-space and copy back, and the servers(and its kernel)
must be changed so that established connections can be transparently 
migrated to the servers.

I don't think it is relavant to the problem of T-Online.


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