Re: [Dovecot] IMAP-proxy or not with sogo webmail and dovecot backend

On Tue, Feb 21, 2012 at 02:33:24PM +0000, Ed W wrote:

I think the original question was still sensible. In your case it seems like the ping times are identical between: webmail -> imap-proxy webmail -> imap server

I think your results show that a proxy has little (or negative) benefit in this situation, but it seems feasible that a proxy could eliminate several RTT trips in the event that the proxy is "closer" than the imap server? This might happen if say the imap server is in a different datacenter (webmail on an office server machine?)

The webmail/imapproxy were actually running in a different datacenter to the dovecot director/backend servers, but only about 20KM away.

Ping tests:

webmail->director:

rtt min/avg/max/mdev = 0.933/1.061/2.034/0.183 ms

director->backend:

rtt min/avg/max/mdev = 0.104/0.108/0.127/0.005 ms

webmail->localhost:

rtt min/avg/max/mdev = 0.020/0.062/1.866/0.257 ms

-jf