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
